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New fuel pump not working... Any ideas as to why?

 
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Old 01-19-2014, 11:16 PM
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New fuel pump not working... Any ideas as to why?

Guys is there any way to figure out why to test a fuel pump without having to just replace it?

I've figured out that my pump is indeed getting power. But, doesn't turn on. The previous owner replaced the fuel pump and filter at 157k... the car currently has 158k. (I have the receipt to prove the work was done) - but the pump is definitely not turning on even though it IS getting power. The work was done way too long ago to consider taking it back to them (even if I could somehow get the car down to Ft. Pierce)

It worked for a while at one point, because It worked when i bought the car and at least a good year after that. The car HAS sat for three years after that and yes I will be draining the tank and refilling with fresh gas and changing the fuel filter just to be safe. But I can't understand why a fuel pump would go bad on its own from just sitting. Any ideas or suggestions on what I can do other than just replacing it? (which I will do if not)
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Old 01-20-2014, 06:10 PM
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Re: New fuel pump not working... Any ideas as to why?

If it is getting power but not turning on, than the circuit isn't being completed. Check your grounds.
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But you need that scoop on the hood. Is it true that they're big enough to fit your lunch box and all your camera gear in it?
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Old 01-20-2014, 08:32 PM
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Re: New fuel pump not working... Any ideas as to why?

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Originally Posted by twokexlv6coupe View Post
If it is getting power but not turning on, than the circuit isn't being completed. Check your grounds.
any chance you could be a little more specific please? what grounds are there on the fuel pump other than the 2 Pin connector on the top of the assembly?

Today, I took the battery from the car and brought it into the back seat with me. I connected the battery to the two pin connector on the pump itself, when doing so there was a littttttle spark on the battery.. which I assume means that the circut is being complted... I could use a test light too I assume to confirm.

Thanks for the suggestions, willing to try it but not sure what other grounds there are to check?
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Old 01-20-2014, 08:52 PM
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Re: New fuel pump not working... Any ideas as to why?

Page 11-106 starts the fuel pump troubleshooting in the FSM


Did the FP turn on/hum when you connected the batt?
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Old 01-20-2014, 10:51 PM
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Re: New fuel pump not working... Any ideas as to why?

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Originally Posted by twokexlv6coupe View Post
Page 11-106 starts the fuel pump troubleshooting in the FSM


Did the FP turn on/hum when you connected the batt?
Yeap looked through the FSM, started at the page you're referring to. It basically says if it has no reaction at that point to replace the pump. I will do that, I just don't understand how a brand new pump dies outta no where. It did work for a few months after it was installed. But I barely put 100-300 miles on it at the time. Then it sat for 3 years. Trying it again now for the first time in that long, and its dead, no reaction what so ever

Answering your question about connecting it to the battery, nope.. zero reaction what so ever.
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Old 01-20-2014, 11:22 PM
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Re: New fuel pump not working... Any ideas as to why?

Did you try starter fluid to attempt to start your car? There might be some serious condensation in your fuel tank. Try adding some dry gas.

If the fuel pump is getting power than it should be turning the motor. Did you try to flush the system by relieving the pressure to get all that old gas out of the system? Relieve the pressure, hook up a fuel pressure tester, turn your key to on a few times and check pressure. If you are getting pressure than your pump is good....

Is your car cranking at all? Do you smell fuel if it does crank, just won't start?
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Old 01-20-2014, 11:36 PM
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Re: New fuel pump not working... Any ideas as to why?

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Originally Posted by ProjectPrelude95 View Post
Did you try starter fluid to attempt to start your car? There might be some serious condensation in your fuel tank. Try adding some dry gas.

If the fuel pump is getting power than it should be turning the motor. Did you try to flush the system by relieving the pressure to get all that old gas out of the system? Relieve the pressure, hook up a fuel pressure tester, turn your key to on a few times and check pressure. If you are getting pressure than your pump is good....

Is your car cranking at all? Do you smell fuel if it does crank, just won't start?
The car is cranking. Similar to the behavior of a bad Main Relay that I've dealt with before.

The wires going to the fuel pump were tested and power is going to that connector. However the pump itself is NOT turning on.

When I hooked the battery up directly to the pump theres no hum or any reaction from the pump. So I'm fairly certain that thats the main issue.

Unless you're saying that the lines/system could have condensation, plugging it somehow, and thats why the pump isn't turning on?

I would assume it would make some noise and at least TRY to prime even if the line isn't clear. No?

I will try your solutions but I've got an essentially free working pump on its way to me from a Florida Preludes FB group member. Figured I'd give that a go first.

I will be dropping the tank, and completely emptying it before refilling with fresh gas and will be replacing the fuel filter at the same time.

I just cannot understand why a new pump and filter would be completely shot even if it did sit for 3 years.

I'm not sure how to flush the system just by relieving pressure. So I'll have to read up on this if there is some way to clean out the line before reinstalling the "new" pump, cleaned out tank and filter.

I'm thinking some way to hook open the line engine side and some how hooking up an air hose or something to blow out anything in the lines from the tank side of the line. Not sure if this is feasable or even common practice... I'm new to fuel systems but learning from the FSM/you guys/and old posts.


On another note... the car was filled with random parts and just crud and crap from sitting and being neglected so long. So in an effort to get to the pump (even though it can be reached from the trunk) I decided to take out the seats, console, and rear seats and then do a thorough cleaning of the interior. Cleared out years of gunk and crap.

So at least it looks decent on the interior now! lol

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Old 01-20-2014, 11:41 PM
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Re: New fuel pump not working... Any ideas as to why?

florida preludes group ftw
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Old 01-20-2014, 11:48 PM
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Re: New fuel pump not working... Any ideas as to why?

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florida preludes group ftw
Definitely! just attended the Central Florida meet... opportunity to meet a lotta great people! even if it was mostly 5th gens!
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Old 01-21-2014, 08:56 AM
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Re: New fuel pump not working... Any ideas as to why?

Ok yea, sounds like the pump itself, which is very odd that it would die after 1k regardless of time. I mean it's sitting in a gas tank lol, it should be protected...

But your not 100% flushing the lines by relieving pressure, but you do flush some of that old fuel out, mainly what is right there at the engine

And jw, why has your lude not been on the road in 15 years? Your signiture says this, and I'm curious

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Old 01-21-2014, 10:02 AM
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Re: New fuel pump not working... Any ideas as to why?

^^ 'cause the fuel pump no worky.
J/K

Sometimes new electrical parts fail too. Try giving it a few wacks with a mallet. It may be stuck.

I let a car sit a year once and the fuel in the lines had turned into a gel. Fuel line was clogged, and the pump was ruined. I had to purge the entire system and replace the pump. Ended up emptying the tank, un-fastening the fuel line, blowing out the crud, re-building the carb and replacing the battery.
Didn't know of sea foam stabilizer back then.

Fast forward 20 years... bought a 91 prelude with a broken engine. It ran, but was ruined. It was going to sit in my driveway who knows how long until a motor swap took place. Well a hurricane was bearing down so I needed to move it. I dumped enough sta-bil in the half full tank for 20 gallons and moved it. When I returned it to the driveway I let that sta-bil get throughout the system by running that rattling engine about 5 minutes. 9 months later she fired up in 30 seconds, bad rings, bearings and all.

If you need to store the car a year or two sta bil is fine. Any longer disconnect the line at the tb and get all the fuel out. Empty all the fuel in the line (possible) and either fill the tank to the top (no room for condensation buildup) or empty it.

Looks like rodents never discovered your car (phew).

Good luck getting her going.
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Old 01-21-2014, 10:11 AM
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Re: New fuel pump not working... Any ideas as to why?

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Originally Posted by ProjectPrelude95 View Post
Ok yea, sounds like the pump itself, which is very odd that it would die after 1k regardless of time. I mean it's sitting in a gas tank lol, it should be protected...

But your not 100% flushing the lines by relieving pressure, but you do flush some of that old fuel out, mainly what is right there at the engine

And jw, why has your lude not been on the road in 15 years? Your signiture says this, and I'm curious
Thats actually. 1.5 years, and factually inaccurate now. as its been 1.5 years since that little image was created lol.

When I bought the car, it had a lot more problems than I was told. I was basically a sucker, but to be honest I didn't care. I wanted it. I was too stupid to realize it had bad synchros when I test drove it (were on their way out) but you live, and learn.

I bought it, and drove it around for about a month. Synchros going the whole time getting to the point where it was un-drive-able. Started puffing white smoke, soon thereafter. (All within less than 1k miles since I bought it) Then it developed a problem where it wouldn't start, of all places, an AutoZone.

So I had to get it towed home. Over the next couple days I figured out there was some sort of relay on the clutch that wasn't allowing the car to start. After jumping a wire per the FSM it fired right up. Never did figure out if it was a switch or a relay but just haven't gotten to it yet. Basically the car would start without having to depress the clutch since I jumped/bypassed that.

The synchros were worse, hard to even get the car in gear. Probably worse due to me changing the MTF (again probably the worse thing I coulda done). So it sat. Life got in the way. Moved in with my g/f, rented out my house. She has no garage, so it sat... and sat... and sat...

We're now engaged, moved into a new home a few months ago with a 2 car garage. So I finally have time to get it running again.

Gonna have to get this pump issue figured out. Transmission rebuilt, I know it needed a new steering rack. I have all new bushings and ball joints that I'll do myself. Then the big elephant in the room is figure out why it was puffing white smoke and if its worth replacing the whole motor, or fixing what I've got. 157k miles so shes gotta be pretty tired by now.

So lots of work. But I bought it to be a project car where I could learn and enjoy rebuilding it, and so far its already taught me a lot.
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Old 01-21-2014, 02:39 PM
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Re: New fuel pump not working... Any ideas as to why?

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Definitely! just attended the Central Florida meet... opportunity to meet a lotta great people! even if it was mostly 5th gens!
i know i was there lulz i didn't have my lude with me though
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Old 01-21-2014, 02:42 PM
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Re: New fuel pump not working... Any ideas as to why?

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i know i was there lulz i didn't have my lude with me though
true good turn out but I think i was the first one to dip around 9:45pm ish... did'nt get a chance to go around and meet everyone.
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Old 01-21-2014, 03:00 PM
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Re: New fuel pump not working... Any ideas as to why?

we went to downtown universal and downtown disney after, going to start planning the next meet soon
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Old 01-21-2014, 03:03 PM
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Re: New fuel pump not working... Any ideas as to why?

Any luck, my car may be able to limp its way out there to meet up!
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Old 01-21-2014, 06:01 PM
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Re: New fuel pump not working... Any ideas as to why?

That switch you jumped on the clutch pedal is the clutch safety switch, it prevents you from starting your car in gear. The switch is wired to a relay, you can find all that info in the service manual update, under the wiring section

However, it's fine to just leave it jumped. That's what you have to do anyway when you install a remote start. Just make sure your in nuetral and you'll be fine
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Old 01-21-2014, 06:43 PM
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Re: New fuel pump not working... Any ideas as to why?

Hey guys, sorry for invading on your thread, I do not really know how to make a new one but I need some help. I bought a 4th gen prelude with an H22a engine swap a few months back and it has been great! But recently the hesitation upon acceleration has become progressively worse over the past couple at weeks, I figured it has something to do with the fuel system, fuel pump, fuel filter etc. I would like to know if I should just replace the filter and hope that the hesitation goes away, or is there other problems that could be causing the hesitation
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Old 01-29-2014, 04:58 AM
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Re: New fuel pump not working... Any ideas as to why?

Remove fuel pump relay and check fuel pump resistance by multi tester. Fuel pumps have 1.5-8 Omhs.
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