Help! Stuck at gas station

[Fusion]

That idea came to mind so I checked yesterday, bought on ebay from TrePerformance and they seem legit.

[Fusion]

Weird ass situation. The pump runs fine off a secondary battery. Both have over 12V.
The car won't start with the pump plug on (car battery) but will with the secondary battery. And while the pump is running off the secondary battery and engine is running, the pump connector (now not plugged in) is showing 13+V.
I tried disconnecting the secondary batt and pluging the pump connector in real fast but the pump won't keep running.

Mind = blown

[Fusion]

I'm not getting 12V at the pump when I jump 86-87. I only get 12V when the car is running off the secondary battery. Could this mean bad CPS?

[Fusion]

I also fixed the pump's connector to make a better connection, no go. Not even stripped wires connected diectly.
Throw some ideas at me.

[devon.818]

what exactly happened when it didn't start?
what were you doing. check all relays and fuses. maybe a pinched wire somewhere.
sounds like you know the pump is good, but when its in your car it doesn't work, so problem with some crap in your car right?

[Fusion]

Yea, but I can't pinpoint the problem.
It started about a week ago, I was driving like 50 and all of a sudden the engine bogged, no accelerator reaction, and died. Luckily noone was around so I just coasted, turned the key and it started right up again. Drove home fine.
Friday I came to the car, started and it died after a few seconds. I drove off anyways and it then died at the gas station I was at (10mi drive).

I did unfortunately have mice in my car, found out because I saw a chewed out hole in the driver Recaro. I woul've killed the fucker if I saw him. No signs of chewed wires though, I don't know where the wires to the pump are lead.

There's a large connector with maybe 12 wires coming from the passenger side that rests under the rear seat. Wonder if pump wires go through there.
Also I need to know if relay jumping 86-87 should show 12V at the pump with just the key on.

Although if a wire was chewed, I don't understand how I could've measured 13V at the connector when the car was running. It makes no sense. It's like the DME is sending voltage to the pump only after it has started. On the other hand I tried "priming" the fuel with the second battery, then connecting the pump connector, then starting and it started up and died after a few seconds.

[Fusion]

Should I try measuring the amperage at the plug?

[dnguyen1963]

Trace your wire from the pump connector back...your mice friend chewed it up somewhere.

[Fusion]

So a 3/4 chewed through wire would show voltage but couldn't tak the load, correct.
Damn, this is going to be a treasure hunt. Douchebag could've chosen something other than the pump wire.

[Fusion]

Couldn't find any obvious damage to wires so I pulled a long wire to the fuse box and I get a continuous multimeter beep all the way from the plug to fuse 11. So can I rule out wires? I visually checked from driver kick panel, through rocker, al the way back.
Also tried sticking that wire in the fuse connection and the other end to pump +, no prime.
What I did notice though is when I had the key on, I could hear a hum in the engine comp., probably coils, but I think this is normal, just never really noticed...

[Fusion]

Looking back, could f34r have such wizardry that the (a) coil is right?
If the DME can "see" a bad coil, does it cut off the pump? This would then all make sense.

[Pdxseth]

Looking back, could f34r have such wizardry that the (a) coil is right?
If the DME can "see" a bad coil, does it cut off the pump? This would then all make sense.

I'm having the same problem I'm gonna try a new coil


Sent from my iPhone using Tapatalk

[Fusion]

Took the cover off and seems the hum is coming from the alternator or something under the intake.

[jlevie]

It sounds to me like there is a high resistance in the current path for the fuel pump or a bad ground. It could be before or after the relay socket. The way to find out where to look is to apply system power to the output pin of the relay socket. If that works the problem is before the socket. If that doesn't help apply system power to the load side of the fuel pump fuse. That will tell if the problem is between the fuse and relay or in the wiring to the pump. Connecting a ground wire to the pump will tell if that is a problem. The pump wiring runs along the left door sill. The ground for the pump wiring is behind the rear seat back.

[Fusion]

Just did the ground test. Pulled a wire from shock tower grounds to pump -, no change.
I'll test your relay idea tomorrow. Thanks!