NO fuel pump...

Hozer 88GTConv · 02-12-2007, 08:48 PM

Gents,
The car died at idle in the driveway today after running for 5 minutes. I noticed that I didn't hear the "whhrrrr" priming noise when I put the key into the ignition.
So, fuel pressure gauge confirmed no fuel pressure. No fuses blown. I swapped the fuel pump out, still no joy. I checked the inertia switch (that white toggle is a little loose, but its 20 years old this summer) and it died at idle. I also swapped the fuel pump relay under the drivers seat.
Still nothing...ideas?

Thanks in advance...

johnwb · 02-12-2007, 09:20 PM

Check the harness at the computer,I had a problem with that before ,It wasnt pushed in all the way,we hooked it while we were applying rust check.I have a wiring diagram that I can post if it is of any use.

Hozer 88GTConv · 02-13-2007, 08:04 AM

Okay, easy enough. Your wiring harness managed to back out? Wow, mine has a serious hold-down bolt, but I'll give the harness a wiggle and see if it is a loose connection at the PCM.
Thanks.

Hozer 88GTConv · 02-13-2007, 03:41 PM

Okay, I swapped fuel pump relays and now the pump runs continuously. I'm assuming I've got a short somewhere...does that make sense or does anyone else have any ideas before I drop the tank again.

Thanks

Hozer 88GTConv · 02-13-2007, 05:57 PM

I checked the orange/light blue wire at the fp relay for resistance. It was above 10k, so I'm thinking no short.
Anything else?

Thanks

Hozer 88GTConv · 02-14-2007, 11:24 AM

Update:
After checking relays, voltages, resistance, etc. I swapped my old speed density computer in to see if the car would act normally.
It did. It ran rough (because it's mass air now) so it looks like a bad eec-iv. Found a A9L for $100.
I'll let you know...

02-12-2007, 08:48 PM	#1
Hozer 88GTConv Registered Member Join Date: Feb 2002 Location: Jacksonville, FL Posts: 706	NO fuel pump... Gents, The car died at idle in the driveway today after running for 5 minutes. I noticed that I didn't hear the "whhrrrr" priming noise when I put the key into the ignition. So, fuel pressure gauge confirmed no fuel pressure. No fuses blown. I swapped the fuel pump out, still no joy. I checked the inertia switch (that white toggle is a little loose, but its 20 years old this summer) and it died at idle. I also swapped the fuel pump relay under the drivers seat. Still nothing...ideas? Thanks in advance... __________________ 1988 GT Convertible 331 10:1 TW heads, GT-40 intake, MSD, TRW flattops, B Cam w/ 1.7's, MAC exhaust, 24's, 70 TB, 76 MAF, 3.73's, Pro 5.0, Koni's, Anderson PMS, Wideband 02, yatta, yatta... One week with new motor, two speeding tickets...joy

02-12-2007, 09:20 PM	#2
johnwb 88lx work in progress Join Date: Jul 2005 Location: canada Posts: 62	Re: NO fuel pump... Check the harness at the computer,I had a problem with that before ,It wasnt pushed in all the way,we hooked it while we were applying rust check.I have a wiring diagram that I can post if it is of any use. __________________ 88lx,4cly body,90 5.0l,e cam,summit headers,holley 650 double,edelbrock performer rpm intake,crane valve springs,e7tes lots of machining,5 speed,3.73s,exhaust flotech,with 2.5"exhaust

02-13-2007, 08:04 AM	#3
Hozer 88GTConv Registered Member Join Date: Feb 2002 Location: Jacksonville, FL Posts: 706	Re: NO fuel pump... Okay, easy enough. Your wiring harness managed to back out? Wow, mine has a serious hold-down bolt, but I'll give the harness a wiggle and see if it is a loose connection at the PCM. Thanks. __________________ 1988 GT Convertible 331 10:1 TW heads, GT-40 intake, MSD, TRW flattops, B Cam w/ 1.7's, MAC exhaust, 24's, 70 TB, 76 MAF, 3.73's, Pro 5.0, Koni's, Anderson PMS, Wideband 02, yatta, yatta... One week with new motor, two speeding tickets...joy

02-13-2007, 03:41 PM	#4
Hozer 88GTConv Registered Member Join Date: Feb 2002 Location: Jacksonville, FL Posts: 706	Re: NO fuel pump... Okay, I swapped fuel pump relays and now the pump runs continuously. I'm assuming I've got a short somewhere...does that make sense or does anyone else have any ideas before I drop the tank again. Thanks __________________ 1988 GT Convertible 331 10:1 TW heads, GT-40 intake, MSD, TRW flattops, B Cam w/ 1.7's, MAC exhaust, 24's, 70 TB, 76 MAF, 3.73's, Pro 5.0, Koni's, Anderson PMS, Wideband 02, yatta, yatta... One week with new motor, two speeding tickets...joy

02-13-2007, 05:57 PM	#5
Hozer 88GTConv Registered Member Join Date: Feb 2002 Location: Jacksonville, FL Posts: 706	Re: NO fuel pump... I checked the orange/light blue wire at the fp relay for resistance. It was above 10k, so I'm thinking no short. Anything else? Thanks __________________ 1988 GT Convertible 331 10:1 TW heads, GT-40 intake, MSD, TRW flattops, B Cam w/ 1.7's, MAC exhaust, 24's, 70 TB, 76 MAF, 3.73's, Pro 5.0, Koni's, Anderson PMS, Wideband 02, yatta, yatta... One week with new motor, two speeding tickets...joy

02-14-2007, 11:24 AM	#6
Hozer 88GTConv Registered Member Join Date: Feb 2002 Location: Jacksonville, FL Posts: 706	Re: NO fuel pump... Update: After checking relays, voltages, resistance, etc. I swapped my old speed density computer in to see if the car would act normally. It did. It ran rough (because it's mass air now) so it looks like a bad eec-iv. Found a A9L for $100. I'll let you know... __________________ 1988 GT Convertible 331 10:1 TW heads, GT-40 intake, MSD, TRW flattops, B Cam w/ 1.7's, MAC exhaust, 24's, 70 TB, 76 MAF, 3.73's, Pro 5.0, Koni's, Anderson PMS, Wideband 02, yatta, yatta... One week with new motor, two speeding tickets...joy

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