NO fuel pump...

Hozer 88GTConv · 04-02-2007, 05:30 PM

The red/black wire to the relay under the driver's seat shows 11.8 vdc. I'd like to test the output, but don't know which one to pierce.

I have 4 of these advance auto parts relays, can they all be bad?

Does anyone have the wiring diagram? I'm thinking the relay itself, because there is no power on the red wire at the fuel pump.

Reminder: The car was idling fine in my driveway when it just stopped. So, I doubt it was the inertia switch crapping out.

thanks...

Hozer 88GTConv · 04-02-2007, 06:22 PM

I've got 12v at the inertia switch red wire too.
should the red black have 12v also back to the fuel pump relay?

I can feel the fp relay actuate under the seat when the keys are turned so it seems to be working.

It's still dead at the fuel pump connector...hmmm

johnwb · 04-02-2007, 06:39 PM

The relay can still turn on without supplying power to the pump.I have a diagram that helped me before,follow the black/orange wire back to the blue wire with fuseible link at the starter solenoid.This is the power wire to the computer that supplys the relay to power the pump,hope you can make some sense of that,lol.

Hozer 88GTConv · 04-02-2007, 07:51 PM

Okay,
Uh, how do you check a fusable link? continuity on both sides?
That matches my diagram too, I'll check it next.
Thanks, John

Hozer 88GTConv · 04-03-2007, 06:03 PM

Okay Gents,
I performed the items on the "crank but no start checklist"
1. When I removed the connector from the starter solenoid, ignition on, and jumpered the screw to the bolt, I got a crank but no spark from the coil plug to a good ground.
2. New coil, new solenoid, no spark. Checked 12volts at the coil wires. Checked all fusible links at the solenoid, the eec-iv relay by the computer and the fuel pump relay, all good with 12v where it should be.
3. New TFI module.
4. Plenty of fuel pressure, and I hear it too.
5. Battery is great, sat it on the charger to ensure plenty of juice.

What next? The PIP module in the distro??...I can't think of much more.
No codes, the STO light stays illuminated during KOEO tests.
Some of the injectors buzz too with the ignition on.
Thanks in advance.

Dark_5.0 · 04-03-2007, 06:44 PM

I would start suspecting a bad ECU. Phuck it, just throw a carbureter on it.

johnwb · 04-03-2007, 07:50 PM

Is there a tach signal?

04-02-2007, 05:30 PM	#1
Hozer 88GTConv Registered Member Join Date: Feb 2002 Location: Jacksonville, FL Posts: 706	Re: NO fuel pump... The red/black wire to the relay under the driver's seat shows 11.8 vdc. I'd like to test the output, but don't know which one to pierce. I have 4 of these advance auto parts relays, can they all be bad? Does anyone have the wiring diagram? I'm thinking the relay itself, because there is no power on the red wire at the fuel pump. Reminder: The car was idling fine in my driveway when it just stopped. So, I doubt it was the inertia switch crapping out. 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

04-02-2007, 06:22 PM	#2
Hozer 88GTConv Registered Member Join Date: Feb 2002 Location: Jacksonville, FL Posts: 706	Re: NO fuel pump... I've got 12v at the inertia switch red wire too. should the red black have 12v also back to the fuel pump relay? I can feel the fp relay actuate under the seat when the keys are turned so it seems to be working. It's still dead at the fuel pump connector...hmmm __________________ 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

04-02-2007, 07:51 PM	#4
Hozer 88GTConv Registered Member Join Date: Feb 2002 Location: Jacksonville, FL Posts: 706	Re: NO fuel pump... Okay, Uh, how do you check a fusable link? continuity on both sides? That matches my diagram too, I'll check it next. Thanks, John __________________ 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

04-03-2007, 06:03 PM	#5
Hozer 88GTConv Registered Member Join Date: Feb 2002 Location: Jacksonville, FL Posts: 706	Re: NO fuel pump... Okay Gents, I performed the items on the "crank but no start checklist" 1. When I removed the connector from the starter solenoid, ignition on, and jumpered the screw to the bolt, I got a crank but no spark from the coil plug to a good ground. 2. New coil, new solenoid, no spark. Checked 12volts at the coil wires. Checked all fusible links at the solenoid, the eec-iv relay by the computer and the fuel pump relay, all good with 12v where it should be. 3. New TFI module. 4. Plenty of fuel pressure, and I hear it too. 5. Battery is great, sat it on the charger to ensure plenty of juice. What next? The PIP module in the distro??...I can't think of much more. No codes, the STO light stays illuminated during KOEO tests. Some of the injectors buzz too with the ignition on. 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

04-03-2007, 06:44 PM	#6
Dark_5.0 Registered Member Join Date: Apr 2001 Location: Staging lane Posts: 4,337	Re: NO fuel pump... I would start suspecting a bad ECU. Phuck it, just throw a carbureter on it. __________________ 92' LX-Big brakes, Lots and lots of suspension, GT40X heads, Ported cobra intake, stock cam, Vortech SC trim. 00' Lightning-Stock 88'CRX-13 second ego killer

04-03-2007, 07:50 PM	#7
johnwb 88lx work in progress Join Date: Jul 2005 Location: canada Posts: 62	Re: NO fuel pump... Is there a tach signal? __________________ 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

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