Bad FPR Diaphragm
Thread Starter
Drifting
Joined: Jul 2014
Posts: 1,426
Likes: 46
From: Lynchburg, VA
Bad FPR Diaphragm
I tested my fuel pressure, and with key on but engine off it would go to 42, then drop about 1 PSI every 2 seconds. I pulled the vacuum tube on the FPR (just to be sure, the vacuum tube is the thin tube that comes off the FPR in the direction of the passenger seat, right?), and gas poured out of it. Since this shows that my FPR diaphragm is bad, I plan on buying this replacement diaphragm and replacing it. Since gas has been sucked through the vacuum line, does anything else need to be done?
Last edited by C4ProjectCar; Jul 19, 2014 at 03:57 PM.
Thread Starter
Drifting
Joined: Jul 2014
Posts: 1,426
Likes: 46
From: Lynchburg, VA
So, it looks like my engine is hydrolocked from gas getting sucked through the vacuum line into the intake manifolds, then draining into the cylinders. I read that this causes gas to get into the oil, necessitating one or two oil changes to get the gas out of the system.
Here's the plan:
Replace the FPR diaphragm.
Pull the plugs, disconnect the coil, and turn over the engine a few times to get the gas out of the cylinders.
Change the oil with some cheap oil, run the engine a while to circulate the oil, then change oil again with some decent oil to keep in there.
Here's the plan:
Replace the FPR diaphragm.
Pull the plugs, disconnect the coil, and turn over the engine a few times to get the gas out of the cylinders.
Change the oil with some cheap oil, run the engine a while to circulate the oil, then change oil again with some decent oil to keep in there.
Thread Starter
Drifting
Joined: Jul 2014
Posts: 1,426
Likes: 46
From: Lynchburg, VA
You mean just leave it with the plugs out instead of cranking the starter? I suppose I could do that, but I'm not sure what the point would be. Is there an advantage to doing it that way?
Team Owner
Joined: Dec 2000
Posts: 90,675
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From: SE NY
Cruise-In II Veteran
Is there an advantage to doing it that way?
Are you sure excess gas has gotten into the cylinders?? Pull a few plugs to see if there is excessive gas smell.
Thread Starter
Drifting
Joined: Jul 2014
Posts: 1,426
Likes: 46
From: Lynchburg, VA
I pulled all of the plugs, but the engine wouldn't turn over (either the starter is bad or a ground isn't connected well) so I'm just letting it sit.
There must have been gas in the cylinders, because it was dripping gas after I pulled them.
There must have been gas in the cylinders, because it was dripping gas after I pulled them.
