BALLSS

OP

you have a high pressure Walbro 392 inline. You report 55 PSI as FP....which is high. Check FP with new regulator...if still high you may need a adjustable FPR to knock down the FP to a spec reading

was the 392 in the car before the crank swap?

fischdogg1

Yeah the pump was already installed beforehand and it was running perfect.

fischdogg1

Crap I just realized the one that was on their before is adjustable. I'm going to put it back on and try lowering the pressure and see what happens. Hopefully this is it.

BALLSS

do you also still have the in tank pump?

the external in line type are often added for SC applications.

once you get the adjustable back on, don't plug in the vacuum nipple. plug it with something and check FP. it wants to be 43.5 without vacuum. It will drop a few lbs once you do plug the vacuum nipple back on, normal

fischdogg1

No the external pump was already set up when I bought the car. I'm going to check the pressure here in a bit.

fischdogg1

When I adjust the FPR it definitely changes the pressure, but when I start the car the fuel pressure actually goes up just a bit (about 2-3 PSI).? If I remove the vacuum hose on the FPR the pressure does go up a bit more (also a couple PSI), but it's not at 43.5 PSI because the pressure isn't dropping when I start the car. When I plug up the FPR the pressure doesn't change.

fischdogg1

The reason I've been assuming a bad injector is because the fuel pressure gradually drops all the way down after I prime the pump.

BALLSS

could be the fuel pump is bleeding off.

Not saying it couldn't be injector leaking, just saying there are other reasons

So with motor running and fuel pressure gauge hooked up and with the vac line pulled, and plugged, you can't get FP down to 43.5 with the adjustable FPR?

fischdogg1

Yeah I can get it down if adjust the regulator.

fischdogg1

I definitely don't want to spend 250 on new injectors if the injector isn't the issue. The regulator is dry though and pressure does go up when vacuum is unplugged. I ordered a new adjustable regulator in case. I'll try messing with the regulator that's on their a little more.

fischdogg1

I set the FP right around 43.5 with FPR vacuum port blocked off. Now when I prime the pump FP is around 37-38. I'm still not sure why it's lower at prime than when running. There's no engine light on but I've seen it flicker a couple times. I'll try code reading and if nothing comes up I'm going to get the injectors and fuel system checked. I still might try replacing the regulator with the adjustable one when it comes in first.

Purple Poncho

iTrader: (1)

Fuel filter?

fischdogg1

It's possible but not likely. I put in a wix filter shortly before I worked on the engine. I haven't driven it many miles since I replaced the fuel filter. It might be the in-line pump motor after the fuel filter, but I would think the fuel pressure would excessively drop off when I start the car not rise up. The pump in the tank is fairly new also. Fuel pressure rising when starting is usually a bad regulator but I'm having trouble diagnosing that as well.

BALLSS

if you have a in-tank pump and are NA motor...why the additional external in-line pump also?

fischdogg1

I have the in-tank pump without the motor in the tank. Just the external GSL392. I think the guy who had the car before for some reason switched over when he worked on the motor. But I've never had issues with that before.

fischdogg1

Well I checked the plugs and found out injector 6 was causing the fuel in oil issue and the idle issue was due to a bad alternator. But, I did notice I've recently been getting a whining noise from the trans. It only does it when the car's in gear, but not in park or neutral. Most likely the torque converter bearing right?