Gas getting into oil
TECH Veteran
Joined: Apr 2008
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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?
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?
TECH Veteran
Joined: Apr 2008
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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
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
Thread Starter
Staging Lane
Joined: May 2017
Posts: 67
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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.
Last edited by fischdogg1; Jun 12, 2017 at 07:51 PM.
TECH Veteran
Joined: Apr 2008
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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?
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Staging Lane
Joined: May 2017
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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.
Thread Starter
Staging Lane
Joined: May 2017
Posts: 67
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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?
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?
Thread Starter
Staging Lane
Joined: May 2017
Posts: 67
Likes: 0
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.
Last edited by fischdogg1; Jun 13, 2017 at 11:45 PM.
Thread Starter
Staging Lane
Joined: May 2017
Posts: 67
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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.
Thread Starter
Staging Lane
Joined: May 2017
Posts: 67
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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?