92rsreed

I just bought a 92 camaro rs w/ a 305 TBI in it. It didn't start when I got it so replaced alot on it since it sat a lil bit before I got it. I've put a new distributor, spark plugs&wires, coil, fuel pump, and fuel pump relay. I had it running for the past few days after replacing the fuel pump and now I just went out and now the fuel pump don't even kick on when the key is on. I'm running out of ideas...smh

thtanner

iTrader: (1)

What have you done to diagnose the fuel pump? Being out of ideas sounds like you did a few things.

Not knowing what you've done, I'd check the relay for the fuel pump. If you crank the engine over oil pressure will kick the fuel pump on (even if the fuel pump relay is not functional).

You can also apply 12v power to the fuel pump and make sure it's working.

92rsreed

The power wire going from the plug in on the sending unit to the plug to the fuel pump in side the tank. The wire terminal in the plug to the top of the sending unit was loose so I had a buddy redo it and seal it up and it worked for the past 2 days I had it running last night but I come out this morning and the pump won't kick on.

Schurkey

The fuel pump harness inside the fuel tank is a known trouble-spot for corrosion and therefore poor connection. I won't replace an in-tank fuel pump without also putting in the new wire harness. They're typically about $20--$25.

Are you sure you have power to the fuel pump hanger connector? Ground? Typically four wires--power and ground to the fuel gauge sending unit, power and ground to the fuel pump. I've found it's common for GM to use undersized wire in those harnesses, and the voltage drop is excessive.

92rsreed

I found out that the power wire from the bottom clip of the ring to the sending unit was shorting out and it fried the terminal it goes on so I already ordered a sending unit for it

92rsreed

So I have replace my sending unit, fuel pump, fuel pump relay, distributor, coil, plugs, wires, and oil pressure switch. It ran for 30 min, took it up the road and back, we to park it in the driveway and it died. So I went to start it up again fuel pump still doesn't kick on. I ran a fuesable link to the connector on the tank to see if thw fuel pump kicks on, which it does. So can someone give me at least some advice or point me in the right direction because after all that I've replaced you would think it would run brand new...?

Schurkey

You've replaced a bunch of parts without doing any diagnosis.

The problem could easily be in the wiring harness. (AGAIN: The harness inside the tank is a known trouble area.)

For that matter, stalling at idle could be a failed IAC; although with the fuel pump failing to run it's likely a pump power-supply (including ground) issue.

If this were in MY driveway, I'd have a low-amperage probe on the fuel pump power wire, looking for anomalies in the pump amperage draw, along with a voltmeter probing that wire as close to the fuel pump as I could access.

I'd also be testing for voltage drop between battery and pump, and between pump and ground.

In addition, I'd be testing to see if the ECM properly powers the fuel pump relay. I'd also want to know if the spark disappears when the pump fails to run--you may have distributor problems.

92rsreed

Ya getting a volt meter tomorrow and going to go from there and the diagnosis is because the car sat for a few years before I purchased it so I'm still working the bugs out of the car. Also I figured them parts needed replaced due to it sitting for a period of time.

Schurkey

NONE of those parts need to be replaced "just because" it hasn't been run for awhile.

They may or may not have been defective, but non-use does not usually cause them to fail. That stuff fails because it's been used, not because it hasn't been used.

Lar98ss

What's the update? Did you find the problem?