No fuel pressure question

[blackbombshell95]

Here is some background. Installed a warbro fuel pump months ago. The pump is noisy from in the cabin, and I can hear it pressurizing in the fuel rails on the 3400 engine. Car would start no prob.
1 week ago the fuel pump stopped turning on so I figured it was bad. I pulled the relay and jumped the connection and the fuel pump turns on! So, 1 of 2 issues that I can think of is the problem. #1 the relay is bad. #2 the signal from the key on isn't there. I have alldata on the 02 GTP but not on the 95 Grand Prix. I had 3 spare used relays that I tried with no luck. Suggestions on where to go from here?

thanks!

[1988GTU]

I THINK you have a 20 or 25 amp fuse that plugs into a cap that houses the fuse. Where it's at I wouldn't know on a W body right off the top of my head, but it is part of the fuel system wiring harness. With that fuse missing or burnt, it will not deliver power to the harness.

[pocket-rocket]

The one for my two cars is on the drivers side between the battery and strut tower. I'm not sure about a 95, though.

[blackbombshell95]

Fuses are good. I am getting 12V at the relay.

[bob442]

you have to check your signal wire, and you have to check your switched power. from there look at a wiring diagram, if you want me to look into it and lead you, post up your specifics of what the car 'use' to be. i'll look into it tmw if i go into work. i would suggest probing with a small paper clip, or tearing the cap off a relay. do not ram a multi meter prob into the relay socket or your going to be FUBAR!

[blackbombshell95]

I j umped the connections with the relay out and the FP turns on. The car is a 95 Grand Prix 3100 from the factory. I think it's also the signal wire from the KEY on. If i know which connector on the relay box then I can repair it.
What would happen if I put my Vmeter in the relay? Ha.
I already popped off the top on one of the relays.

[bob442]

if you spread the connector that the relay pins plug into, it wont make a proper connection and lead to issues down the line. if its your signal its most likely coming directly from the pcm. i would have to look.

[pocket-rocket]

if you spread the connector that the relay pins plug into, it wont make a proper connection and lead to issues down the line. if its your signal its most likely coming directly from the pcm. i would have to look.

QFT.

Different example, but same concept;

I've had to fix light bulb sockets by prying the connectors back together after scraping them clean and then applying dielectric grease to keep out moisture and prevent corrosion. I've yet to have one come back to me after doing this

[TGP37]

Not sure if 95's have VATS. My 96 Grand Prix did and the hammers in the key switch failed one day. The fuel pump will refuse to prime or be turned on by the PCM. If you do have a VATS security system then I believe the security light on the dash will blink several times. Not 100% but pretty sure it flashes.

If it is VATS Passkey failure, you should be able to find a write up on the I-Net somewhere to bypass it.

I was quoted roughly $1,000.00 to fix the hammers by a dealership. I said F**K no and bypassed it for the cost of $5.00 for the resistors.

[pocket-rocket]

The Achieva security light flashed when VATS screwed up. Unplugging the harness to the key let it run. I was shocked, to say the least.

Sent from my Galaxy Prevail using Tapatalk.

[bob442]

A8 from pcm if the fuel pump signal, and its a green white at the relay, the tan wire is a ground that goes to the lower front of the engine, red is fuel pump prime control which i cannot get any info about, orange is ECM BATT fuse, and its connected with the oil pump pressure, so if you are not getting oil pressure that would cause a problem i believe.
so on the under side of your relay, 86 is the tan wire, test that for a perfect ground, 85 is the green, test that for 14.4 volts KOEO. let me know...

If your fuel pump was noisy, it was most likely drawing alot of current, which would cause a relay to burn up, fuse to blow, or connector to melt, or wire to burn. lets start with the basics here.

[blackbombshell95]

Solved the problem. The IGN is suppose to send a 12v signal to the relay which was at 125mv when I tested it. Instead of tracing the break I cut the wire 6" from the relay. I used another unused IGN 12v source and jumped that to the relay and now it works just fine. But while I was in there I decided to add a fuel pump cut off switch .

Thanks to all those who gave their input, it is appreciated.

[pocket-rocket]

I've considered installing a Ford inertia switch in my car for safety.

[TGP37]

I've considered installing a Ford inertia switch in my car for safety.

I was looking into building an engine bay fire extinguishing unit. Have an emergency switch, when pulled, will spray the entire engine bay. Probably could be rigged to fire with airbag deployment too.

I have a normal fire extinguisher in the trunk. I pull it out when I weld & monitor 1st starts after a tear down. I bought it after watching a minivan catch fire at a stop light, the van was 2 cars ahead of me. It started as a small tendril of smoke, the driver opened the hood and flames jumped out at him burning his face. Seconds later the front end was engulfed in flames. We were stuck until the van was towed away. I did look at the bay after the fire department put the fire out. Man, it looked bad.