Car floods, Engine runs without fuel pump

[6BoltSleeper]

Ok my car is a 90 Eagle Talon TSI AWD. My problem is when trying to start the car, it floods immediately, as in fuel pouring out of my down pipe. I disconnect the fuel pump connector and turn the engine over for a few and eventually it hits, then starts. It runs (like crap) and will continue to stay running for at least 20 minutes. Then while idling, I plug in the fuel pump and it dies. The car is stock with exception of a T-28 killer turbo, 2G Maf, and Wally 255 pump. I'm getting no CEL and I can hear the fuel pump come on and go off like normal. I haven't checked the caps in the ecu yet as I plan on doing that tomorrow and trying another fuel pump/ecu relay. I've searched but found no answers. Somebody please tell me what you think. Sorry for all the reading, but I'm trying to explain as much as I can. Thanks for reading.

 

[gofer]

Fuel pouring out of your downpipe would mean your cylinders are literally FULL of gasoline and your washing your cylinders, it would also mean your oil pan is probably full of gas too. Your cylinder walls are splash lubed, not pressure lubed and the thin layer of oil there protects the pistons from scrapping the block. Excessive fuel (and excessive is an understatement in your situation) will wash this oil off your piston walls and promotes excessive ring wear and cause your pistons to scuff the block.

 

[6BoltSleeper]

So you're saying that I need to change the oil, but then how do I keep the fuel from washing out my cylinders? I need to figure out to prevent it from happening again. Thanks for the reply

 

[gofer]

So you're saying that I need to change the oil, but then how do I keep the fuel from washing out my cylinders? I need to figure out to prevent it from happening again. Thanks for the reply

If fuel is physically dumping OUT of your exhaust mani ports into your downpipe then use that to your advantage to troubleshoot, take off your exhaust manifold and see which runner its coming from. My best guess is your 255 is overunning the stock fuel pressure regulator (fpr) on the driverside of your fuel rail. That, or you've got a fuel injector or two stuck open.

I have NO EDUCATED guess as to whats happening to your car man, it sounds crazy to me if everything you typed up is true. Your car shouldn't idle for 20 minutes with a disconnected fuel pump! Get a fuel pressure guage and check fuel pressure at the rail and 1g fuel pressure is 37psi-M/T or 43psi-A/T with the vacuum line OFF your fpr and the car idling.

 

[6BoltSleeper]

ok I'm doubting very seriously that all my injectors are stuck open, so I'm leaning towards the fpr, as it makes the most sense to me. I'll try another one tomorrow to find out for sure. I'm also gonna try the ecu/f.p relay, and ecu. If I can find a stock pump, I'll try that also, unless I can find an adjustable regulator. Thanks for your help.

 

[bastarddsm]

ok I'm doubting very seriously that all my injectors are stuck open, so I'm leaning towards the fpr, as it makes the most sense to me. I'll try another one tomorrow to find out for sure. I'm also gonna try the ecu/f.p relay, and ecu. If I can find a stock pump, I'll try that also, unless I can find an adjustable regulator. Thanks for your help.

I have seen the ecu do that when the caps go bad. They will hold the injectors open and the fuel pump on while the key is on. I have also seen them still have spark while this is going on.

So start by checking your ecu.

 

[91Bomb]

I have seen the ecu do that when the caps go bad. They will hold the injectors open and the fuel pump on while the key is on. I have also seen them still have spark while this is going on.

So start by checking your ecu.

Exactly!


My '92 N/T car did that and fuel came pouring out the air filter and def was a cap-leaked ecu. Lucky in my case motor or anything wasn't damaged and extremely lucky the car didn't burst into flames