Fuel Pump problem!

[jims2321]

Here is the 411. When I turn on the key, the fuel pump starts up, but after about 5 secs, without me starting the car, instead of turning off, it keeps pumping fuel, obviously flooding the engine. Any idea where to start diagnosing the problem?

Jim

 

[Adam95GT]

Here is the 411. When I turn on the key, the fuel pump starts up, but after about 5 secs, without me starting the car, instead of turning off, it keeps pumping fuel, obviously flooding the engine. Any idea where to start diagnosing the problem?

Jim

Is the CCRM making a clicking or buzzing sound??? if so check your grounds... I was having the same problem and it ended up being the big black connector in the pass back corner of the bay.

Played with any wiring lately?

 

[toyman]

Here is the 411. When I turn on the key, the fuel pump starts up, but after about 5 secs, without me starting the car, instead of turning off, it keeps pumping fuel, obviously flooding the engine. Any idea where to start diagnosing the problem?

Jim

If it is flooding the engine then the injectors are leaking. That may be the wrong assumption. Have you checked the fuel pressure? The pump is controlled by the PCM. If the fuel pump lead is grounded at the data link connector (OBD1 test port) or anywhere else the pump will run continuously. If you fully depress the accelerator (WOT) that will shut down the injectors and put you in "flood clear mode". See if that stops the pump from running. Possible ignition switch problem as well. Try wiggling the key to see if that stops the pump as the pump will be running in start mode.

 

[Zero Signal]

Well even if the injectors are leaking, the fuel pump should only prime for a couple of seconds. There's no pressure-feedback to the pump that tells it to turn off, only a preset time. But if the engine is flooding, there still may be a leak which would be a second, unrelated problem unless it really is an electrical issue that's causing both the pump to stay on AND sending a signal to the injectors. I would start by checking all the grounds.

 

[toyman]

Well even if the injectors are leaking, the fuel pump should only prime for a couple of seconds. There's no pressure-feedback to the pump that tells it to turn off, only a preset time. But if the engine is flooding, there still may be a leak which would be a second, unrelated problem unless it really is an electrical issue that's causing both the pump to stay on AND sending a signal to the injectors. I would start by checking all the grounds.

I wasn't very clear. The PCM contols the prime duration and that is about 1 second. The OP talked about flooding which I stated was likely the wrong assumption. I mentioned that a grounding issue may be the cause if the fuel pump lead is grounded.

 

[jims2321]

sorry, I did not respond sooner, I will get on the fuel pump issue over the 4th, and let everyone know what the solution was, thank everyone for the starting point.

 

[jims2321]

Sorry about not getting back sooner on this thread. It looks like the fuel issue is resolved. I happened to of picked up an CCRM back in 2000, for some dumb reason and it sat around.

So I swapped the CCRM, changed the fuel filter and oil (just in case some fuel was in it). Turned the key and it fired up. I then took on the local streets to see if it was drivable and to my surprise it ran just fine.

So I suspect it was a faulty CCRM and luck favors the prepared.

Jim

 

[bayellowstang]

You are correct about luck favoring the prepared. I had a friend that worked at the local pick and pull. Had him "pick" me a new EEC and CCRM. Fan went out and took the ccrm with it a few weeks later.

Glad you got it all working.