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Old 10-11-2017, 03:18 PM
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Fuel Pump Relay

Please provide the vehicle location for the fuel pump relay on a 1999 (5th gen.) Prelude. THANK YOU.

SilentRon
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Old 10-13-2017, 01:53 PM
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Re: Fuel Pump Relay

Surely there's at least one 'Lude Tuner that knows the answer to this one.........
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Old 10-14-2017, 05:04 AM
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Re: Fuel Pump Relay

It is the PGM-Fi - relay.
The Main Relay is bolted to the upper left hand side of the drivers footwell. It is a light grey box.
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Old 10-19-2017, 03:29 AM
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Re: Fuel Pump Relay

So there is one 'Lude Tuner that knows the answer......Clinton1.

THANKS!!!!
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Old 10-19-2017, 03:29 AM
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Re: Fuel Pump Relay

So there is one 'Lude Tuner that knows the answer......Clinton1.

THANKS!!!!
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Old 10-19-2017, 02:02 PM
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Re: Fuel Pump Relay

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Originally Posted by SilentRon View Post
So there is one 'Lude Tuner that is willing to look past my attitude and answer a question I could have answered myself by looking in the shop manual......Clinton1.

THANKS!!!!
It's a sad fact that board activity is down -- a trend not unique to this board -- so there are fewer people than there used to be who know their way around Preludes and are willing to wade through the spam and check actual questions. More reason to be pleasant to those who are left....

Thanks, Clinton.
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Old 10-19-2017, 05:41 PM
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Re: Fuel Pump Relay

Absolutely! I've been wrenching on cars for over 55 years and I find automotive forums to be an extremely valuable resource. I can't thank people enough for taking the time to respond to threads on this and other forums.
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Old 10-19-2017, 05:51 PM
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Re: Fuel Pump Relay

Not everyone on these forums has a shop manual......that's why we use the forum! Thank God for people willing to share their knowledge.

I'll overlook that I was "quoted" incorrectly. I'm sorry if I came across with an attitude; that was not my intent.
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Old 10-19-2017, 09:56 PM
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Re: Fuel Pump Relay

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Originally Posted by SilentRon View Post
Not everyone on these forums has a shop manual....
?!! Then we have a deal for you! All Gen. Prelude Service Manuals -- download the one you need, or collect the whole set! Or if you like to have the actual book to prop up where you see it while working, they're still available (for a price) from Helm, Inc.

And if you have more questions, ask, but have a little patience. The community's a bit thin these days.
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Old 10-20-2017, 04:43 PM
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Re: Fuel Pump Relay

I'll have to check out the PZ link for Prelude Service Manuals; THANKS! I have a Chilton Repair Manual for my 5th Gen. Prelude. Chilton is OK, but it doesn't cover everything. Accordingly, I have more questions (sorry):

Looking above the fuse panel in the passenger compartment, I find 4 rows of what appear to be relays. The top row contains 3 relays: grey, black, black (from left to right). The second row has a large black relay (Mitsuba FR-3501). The third row has 3 relays: metal, black marked "HTR" (heater), and black (also L to R). The bottom row has 2 relays: metal marked "S/R" (supplemental restraint?) and green marked "RR DEF"
(rear defroster). I find no relay marked "PGM-FI" nor do I find any relays bolted in place; however, the gray plastic housing holding the relays is bolted in place. My question is which relay is for the fuel pump (PGM-FI)? In the mean time, I'll definitely check that Service Manual hyperlink to see if it answers my question. THANKS AGAIN!
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Old 10-20-2017, 04:43 PM
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Re: Fuel Pump Relay

I'll have to check out the PZ link for Prelude Service Manuals; THANKS! I have a Chilton Repair Manual for my 5th Gen. Prelude. Chilton is OK, but it doesn't cover everything. Accordingly, I have more questions (sorry):

Looking above the fuse panel in the passenger compartment, I find 4 rows of what appear to be relays. The top row contains 3 relays: grey, black, black (from left to right). The second row has a large black relay (Mitsuba FR-3501). The third row has 3 relays: metal, black marked "HTR" (heater), and black (also L to R). The bottom row has 2 relays: metal marked "S/R" (supplemental restraint?) and green marked "RR DEF"
(rear defroster). I find no relay marked "PGM-FI" nor do I find any relays bolted in place; however, the gray plastic housing holding the relays is bolted in place. My question is which relay is for the fuel pump (PGM-FI)? In the mean time, I'll definitely check that Service Manual hyperlink to see if it answers my question. THANKS AGAIN!
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Old 10-20-2017, 05:59 PM
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Re: Fuel Pump Relay

Don't know why some of my posts appear twice on this thread; I only clicked once to submit.

Tried downloading the Service Manual, but got "Failed Network Error." My computer behaves worse than my Prelude. LOL. I'll have to try the download using a REAL computer.
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Old 10-20-2017, 06:01 PM
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Re: Fuel Pump Relay

Don't know why some of my posts appear twice on this thread; I only clicked once to submit.

Tried downloading the Service Manual, but got "Failed Network Error." My computer behaves worse than my Prelude. LOL. I'll have to try the download using a REAL computer.
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Old 10-22-2017, 09:22 PM
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Re: Fuel Pump Relay

Quote:
Originally Posted by SilentRon View Post
I'll have to check out the PZ link for Prelude Service Manuals; THANKS! I have a Chilton Repair Manual for my 5th Gen. Prelude. Chilton is OK, but it doesn't cover everything. Accordingly, I have more questions (sorry):

Looking above the fuse panel in the passenger compartment, I find 4 rows of what appear to be relays. The top row contains 3 relays: grey, black, black (from left to right). The second row has a large black relay (Mitsuba FR-3501). The third row has 3 relays: metal, black marked "HTR" (heater), and black (also L to R). The bottom row has 2 relays: metal marked "S/R" (supplemental restraint?) and green marked "RR DEF"
(rear defroster). I find no relay marked "PGM-FI" nor do I find any relays bolted in place; however, the gray plastic housing holding the relays is bolted in place. My question is which relay is for the fuel pump (PGM-FI)? In the mean time, I'll definitely check that Service Manual hyperlink to see if it answers my question. THANKS AGAIN!
The Helm manual is definitely worth the investment if you can't download the files.

The main fuel relay isn't in the fuse box -- in the 4th and 5th gen cars, it's all by itself up under the dash on a metal tab, to the left of the steering column. It's a PITA to reach and replace -- prepare to spend some time lying upside-down under the dash. Once you get it off, it's perfectly acceptable to zip-tie the replacement to the tab, rather than wrestling it back on.

To check it before you go to all that trouble, turn the ignition to ON, if you sit for a moment, you should hear a click -- that's the relay. No click is a sign the relay is bad. It can be intermittent -- the fail mode is usually cracked solder joints due to age, and when the relay's hot, they separate. So the car will start fine in the morning, but after driving around a bit, shutting off, then trying to restart, it'll quit. Or if the car's parked someplace where the interior gets good and hot, you may see the same behavior. It'll get progressively worse over time.
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Old 10-23-2017, 12:41 AM
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Re: Fuel Pump Relay

Thanks for the response Jamie! I'm quite used to the PITA working on late model cars. That's why I prefer vintage vehicles. Thanks again for the info; very helpful. My Chilton Manual gives a test procedure for the relay.

On a different subject, I find no indication of any trouble codes set on the vehicle, but I've not been able to locate an OBD II port. I know lots of imports have the port located under the ashtray, but not on the 5th Gen. Prelude. I would expect a 1999 vehicle to have an OBD II port somewhere. Anyone know the port location if any?

THANK YOU!
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Old 10-27-2017, 12:46 PM
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Re: Fuel Pump Relay

This is where the Helm manual is worth its weight. Behind the access panel on the right side of the center console in the passenger footwell. Page 11-36 of the 5th gen manual...there's even a picture!

(I don't work for or have any financial interest in Helm, Inc, but have consistently found their manuals to be better than anything else on the planet.)
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Old 10-27-2017, 02:32 PM
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Re: Fuel Pump Relay

Hey Jamie, I agree with you regarding Helm manuals. I also have no financial interest in Helm. They are the most thorough manuals out there; perhaps that's why manufacturers recommend them. I've purchased several Helm manuals for other marques and they are quite helpful. I used to read (and re-read) them when I was first learning automotive repair. Guess I'll just have to order one for my 'Lude. Thanks for your responses!
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Old 11-06-2017, 06:18 PM
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Re: Fuel Pump Relay

My Helm Service Manual arrived today. Page 11-132 clearly states: "The PGM-FI main relay actually contains two individual relays. This relay is located AT THE LEFT SIDE OF THE COWL." (emphasis added) Guess I'll continue searching for truth.....and my fuel relay. LOL!

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Old 11-07-2017, 11:59 AM
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Re: Fuel Pump Relay

Now I find a Helm diagram on page 23-7 that clearly shows the PGM-FI main relay in the dash area left of the steering column. Perhaps Helm Inc. should actually edit their manuals prior to publication? Just sayin'. Page 11-132 or 23-7? Guess I could flip a coin! LOL.

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Old 11-07-2017, 12:08 PM
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Re: Fuel Pump Relay

Hmmm...logic dictates I go with the dashboard location; that's the consensus of responses to this thread.

Thanks again!
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Old 11-12-2017, 11:35 PM
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Re: Fuel Pump Relay

I've seen this language in many manuals for Japanese cars. As best I can tell, while we normally consider the cowl to be the fixed metal piece behind the hood, they consider it to be the lower part of the dashboard...which is also called the dashboard elsewhere. Can't explain the logic. But anyhow, yes, the relay's under the dash. And while it is electrically two relays, they're in the same plastic case -- it's a single pull-and-replace component.
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