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Fuel pump has me stumped...any ideas

 
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Old 11-14-2011, 02:25 AM
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Fuel pump has me stumped...any ideas

After spinning out into a curb i got out of the car and inspected for damage, luckily there was no damage. I fired the car up and drove it home. Checked tire pressure and found my tire pressure was low. Fired the car up again and went to a nearby gas station. After getting tire pressure sorted out. Car would crank but not start. I realized fuel pump was not priming. I had got the car towed home checked main relay - it clicks and CEL comes on for 2 secs then turns off but pump still not priming. I used a small wire to jump #5 and 7 pins on main relay per service manual and checked for voltage at the connecter for the fuel pump and it reads 11.2V (my battery is reading 11.9). Suspected a bad pump so I took it out of the tank and connected the pump directly to my battery and the pump turns on.

So main relay is ok
Pump is ok
pump is getting power

Then why is the pump not priming? Not sure what im missing here. BTW I've tried replacing main relay and the pump just to be sure but still same problem persists.
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Old 11-14-2011, 10:21 AM
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Re: Fuel pump has me stumped...any ideas

sounds like a silly question, BUT, how much fuel is in the tank? Also, have you pulled the fuel filter. A smack that hard may have loosened enough material to plug the line.

I would make sure you are getting fuel pressure at the filter inlet; and work from there.
But I am by no means mechanically inclined... this is just what makes sense to me.

Oh.. and I should rep you a million rep points for actually using the manual and performing the tests it recomends.
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Old 11-14-2011, 10:54 AM
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Re: Fuel pump has me stumped...any ideas

There is a 1/4 tank of gas. Also I relieved pressure in the system before pulling out the pump. Now that pump is no longer priming I don't think there is any way to build measurable pressure back up in the system.
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Old 11-14-2011, 11:29 AM
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Re: Fuel pump has me stumped...any ideas

You prolly knocked the fuse loose look in underdash fuse box wiggle the acc fuse I think it a 10 fuse while trying to start it... Lmk what happens
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Old 11-14-2011, 01:49 PM
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Re: Fuel pump has me stumped...any ideas

i have the same problem exept no spark ive repaced main relay /ecu/all the relays in the car /cleaned the termostat ground n nothing......
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Old 11-14-2011, 02:08 PM
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Re: Fuel pump has me stumped...any ideas

Quote:
Originally Posted by jdmhonda View Post
i have the same problem exept no spark ive repaced main relay /ecu/all the relays in the car /cleaned the termostat ground n nothing......


that's not the same problem at ALL!! the fuel and spark system are two completely different, separate, unrelated systems from each other.
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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 11-14-2011, 03:28 PM
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Re: Fuel pump has me stumped...any ideas

This is NOT my fuel pump just downloaded pic to illustrate a point cuz I'm not home with the car at the moment.



I hooked up the fuel pump by running wires from the battery directly to the pump and then ran wires from the connector at the to of the L bracket to the battery. Both times the pump turned on. I did this to rule out a bad connection btwn the bracket connector and the pump.


Quote:
Originally Posted by abelsgotspeed View Post
You prolly knocked the fuse loose look in underdash fuse box wiggle the acc fuse I think it a 10 fuse while trying to start it... Lmk what happens
I'll try this when I get home.
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Old 11-14-2011, 03:54 PM
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Re: Fuel pump has me stumped...any ideas

Quote:
Originally Posted by VTEC_lude View Post
After spinning out into a curb i got out of the car and inspected for damage, luckily there was no damage. I fired the car up and drove it home. Checked tire pressure and found my tire pressure was low. Fired the car up again and went to a nearby gas station. After getting tire pressure sorted out. Car would crank but not start. I realized fuel pump was not priming. I had got the car towed home checked main relay - it clicks and CEL comes on for 2 secs then turns off but pump still not priming. I used a small wire to jump #5 and 7 pins on main relay per service manual and checked for voltage at the connecter for the fuel pump and it reads 11.2V (my battery is reading 11.9). Suspected a bad pump so I took it out of the tank and connected the pump directly to my battery and the pump turns on.

So main relay is ok
Pump is ok
pump is getting power

Then why is the pump not priming? Not sure what im missing here. BTW I've tried replacing main relay and the pump just to be sure but still same problem persists.

i don't think you can make this assumption (at least, not without testing the wires to the FP with a test light with the key turned to II)
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2005 Stage2.5+ Subaru WRB STi : RzKar!
Ivey Tuned - Advan - Cobb - Rallispec - CP - Perrin - ACT - KillerB - Carillo - TurboXS - Defi - Innovate - Walbro - DeatschWerks - Feal - H&R - Alpine - Infiniti - Curt

2001 Kawasaki STX1100 D.I. - Sold!
2007 Sea-Doo RXT 215; ET 127 +3 S/C impeller, DIY 3" intake, DIY resonator delete/free flow exhaust, DIY oil catch can, Rule 500gph bilge pump


Quote:
Originally Posted by Brash View Post
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 11-14-2011, 08:38 PM
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Re: Fuel pump has me stumped...any ideas

Quote:
Originally Posted by twokexlv6coupe View Post
i don't think you can make this assumption (at least, not without testing the wires to the FP with a test light with the key turned to II)
So just because there is voltage being read at the 2P connector for the FP doesn't necessarily mean that there is sufficient current? Sorry man I'm not that knowledgeable when it comes to electrical stuff. Can I use the multimeter to test this (I mean what kind of value am I looking for) or just go buy a test light?
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Old 11-14-2011, 09:30 PM
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Re: Fuel pump has me stumped...any ideas

Ooops sorry I was at work before and didn't fully read everything hahaha. Yea if your getting 11.2 volts at the FP connector than it is getting power, that was my bad.


Hmmmm this is intriguing...
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1995 Honda Prelude SE Turbo; 250whp, 275wtq @ 10psi Soldddd!!!

2000 Acura TL; DD
2005 Stage2.5+ Subaru WRB STi : RzKar!
Ivey Tuned - Advan - Cobb - Rallispec - CP - Perrin - ACT - KillerB - Carillo - TurboXS - Defi - Innovate - Walbro - DeatschWerks - Feal - H&R - Alpine - Infiniti - Curt

2001 Kawasaki STX1100 D.I. - Sold!
2007 Sea-Doo RXT 215; ET 127 +3 S/C impeller, DIY 3" intake, DIY resonator delete/free flow exhaust, DIY oil catch can, Rule 500gph bilge pump


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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 11-14-2011, 10:42 PM
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Re: Fuel pump has me stumped...any ideas

you shoulda hit the bottom of the tank with a hammer while the pump was still in while somebody is cranking it over. if the car starts while your hitting it then shuts back off when you stop then the pump is bad. a old trick that ive used many of times.. some how the jolt of you hitting it kicks the pump on ... not really sure how it works but it does lol. hope this was some kinda help
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Old 11-15-2011, 12:17 PM
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Icon8 Re: Fuel pump has me stumped...any ideas

I didn't know our vehicles were equipped with one of these...

1979-2001 Honda Prelude Inertia Switch - Body Electrical - Standard Motor Products 79-01 Prelude Inertia Switch - 6051-07037123 - PartsGeek

Where is it located???? or is this some aftermarket crap???

Last edited by VTEC_lude; 11-15-2011 at 12:20 PM. Reason: added more text
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Old 11-16-2011, 03:26 PM
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Re: Fuel pump has me stumped...any ideas

Fuel pump problem solved. Splicing a wire into the the existing FP power wire upstream near the main relay all the way back to the FP gave me a working FP. Wire must be pinched or bad somewhere between there. Still not sure why I was able to read 11.2 V all the way back at the 2P connector... Just glad I eventually got it diagnosed. Thanks for all the feedback.
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Old 01-20-2014, 02:40 AM
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Re: Fuel pump has me stumped...any ideas

This makes no sense lol. I'm in a similar situation right now. I have power to the connector. Pump won't turn on though. The pump was brand new and working fine right before the car had to sit for about 3 years. Trying to get it up and running again now though. I'm gonna pull the pump and go directly to the batt to see if it turns on. But you getting power to the connector and not to the pump makes no sense to me.
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Old 02-19-2014, 09:12 PM
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Re: Fuel pump has me stumped...any ideas

Quote:
Originally Posted by starbai View Post
This makes no sense lol. I'm in a similar situation right now. I have power to the connector. Pump won't turn on though. The pump was brand new and working fine right before the car had to sit for about 3 years. Trying to get it up and running again now though. I'm gonna pull the pump and go directly to the batt to see if it turns on. But you getting power to the connector and not to the pump makes no sense to me.
Did you figure out the problem?

You don't need to pull the pump out. Just jump the pin #5 & #7 on the main relay connector and turn the ignition to start position. This will send 12v from pin #5 to pin#7 which goes to fuel pump.
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Old 02-20-2014, 12:10 AM
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Re: Fuel pump has me stumped...any ideas

Well I have power going to the connector at the fuel pump so that should tell me that the relay is fine.

I've got a used but working pump (temporary solution) for free that I haven't had the chance to put in yet. My guess is that should fix the problem. I'm gonna hook the pump up to a 12 volt source before putting in just to make sure its making noise/doing something (working)
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