NOR-CAL General Chat.

[Steven]

Does it matter if I have the right color relay?

[kronus]

nope, as long as it's a typical 4-pin, a relay is a relay

does the pump itself buzz when you turn the ignition on? can you check for voltage?

are your fuel lines backwards

[Steven]

nope, as long as it's a typical 4-pin, a relay is a relay

does the pump itself buzz when you turn the ignition on? can you check for voltage?

are your fuel lines backwards

No it doesn't buzz and how do you check voltage with the rubber gromits around the wires? And I have the fuel lines disconnected now so that's irrelevant

[Vivek]

Lol as soon as you get this working you're gonna have a gas fountain. Is there no nut or anything on the wires you can poke a multimeter on?

[kronus]

No it doesn't buzz and how do you check voltage with the rubber gromits around the wires? And I have the fuel lines disconnected now so that's irrelevant

pull the plug at the fuel pump and stick a voltmeter across the pins

[Steven]

Okay no power at the fuel pump

[Steven]

No power at the c101 either for the green violet wire

[kronus]

[Steven]

No power to the fuse either ahhh

[Steven]

So here's what I've got going on.
No fuel
Checked power at the relay pump and fuse nothing
Figured out that the red wire coming into the relay is getting power but when you turn the car over the green violet isn't. Changed the relay with 3 different ones.

Now I'm onto sensors. Is there any sensors anywhere that could stop it from giving it power?

[PorscheH6]

I had a bad crank sensor on my s38. Without a signal the DME wouldn't ground the fuel pump. Does anyone know if stevens car has a similar system?

[e30partsguy]

So here's what I've got going on.
No fuel
Checked power at the relay pump and fuse nothing
Figured out that the red wire coming into the relay is getting power but when you turn the car over the green violet isn't. Changed the relay with 3 different ones.

Now I'm onto sensors. Is there any sensors anywhere that could stop it from giving it power?

check your ignition switch.

[Steven]

So the main relay isn't giving power to the red/white wire which gives power to the green violet. The relay is fine we've tried 3 different ones in it

[PorscheH6]

Ok this is what happened after I swapped engines in my e34.

It would crank but get no fuel to the rail. I checked voltage at the relay and only the constant on side had power. I checked voltage at the fuel pump and got nothing. Also got 0v at the fuel pump fuse.

I chased the problem for what seemed like forever but I finally tested the cps. No continuity. Turns out the harness was damaged. Fixed it up and the car fired.

I only mention this because the symptoms seem similar

[Steven]

check your ignition switch.

Why would that be bad if it worked perfectly a month and a half ago?