Question about 1986 Chevrolet Corvette

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I put a new fuel regulator on my 1986 Corvette and now I have fuel going back into the vacuum lines. Why?

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Regulator would have to be bad. even if its new.

Posted on Sep 05, 2009

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1993 corvette was running great then going about 50 it just quit, cranks but won,t start


check your fuel pressure should be 35 to 42 with key on engine off,and about 5 to 7 more with engine running and vacuum line off the regulator,also check your fuel regulator with vacuum off it should be dry if it is wet with gas it is bad

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Fuel pressure regulator can it stop your car from starting


fuel lines hook up backwards problem solved...

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I have changed twice the MAP sensor in Chevy Corvette 1994, but the car continues to run extremely rich


check the vacuum line on the fuel pressure regulator. If there is fuel in it, replace the regulator.

Dec 06, 2010 | 1994 Chevrolet Corvette

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89 ford f150 in-line 6 cylinder. i have replaced a few injectors both fuel pumps and filter. idles like a dream. when i hit the gas it studders but doesn't die. need more info ask. any ideas?


This is for a 1989 Ford F150 In-Line 6-Cylinder (4.9L) wrongly posted by the Asker under a 1986 Ford Mustang....

Fuel Injector Pressure Regulator. Look it up on line at any of the reputable auto parts websites to get an idea what it looks like.
There should be a Rubber Vacuum Line coming from this (the Regulator is located on the Fuel Line prior to the Fuel Injectors) to the Intake. Take this Line OFF. If there is gas in that line = The Fuel Injector Pressure Regulator diaphram is broken and the Fuel is being dumped into the Intake and NOT being advanced onto the Fuel Injectors; and the Regulator must be replaced.
Let me know if this helped.

Apr 01, 2010 | 1986 Ford Mustang

1 Answer

Falls on it's face when throttled ,but runs good when rpm's are up.rough idle checked forvacume leaks changed iac valve ,egr,cap and rotor,adjust throttle positioning sensor with butterfly


Slimsoul, a bad fuel pressure regulator would cause a problem similar to this. You may already know this but a fuel pressure regulator kinda works backwards from the way you would think. When your car is at idle it produces the most amount of vacuum which power things like brakes. As your RPM's increase your vacuum drops. When a fuel pressure regulator recieves 0 vacuum it fully opens and allows the most amount fuel to flow through. So, you mash on the gas from idle and the car stumbles from lack of fuel. A common cause of this is because the regulator diaphram has a hole in it, which causes it to open slowly. There is a very simple test for this that, yes, even you can try at home. I'm assuming your corvette is a C4 (84-96). Open the hood, stand on the passengers side, and stare towards the back of the plenum just in front of the distributor. Now look underneath the upper plenum, and attatched to the lower manifold at an approximate 45 deg angle is a round piece that kinda resembles a top hat. This is your regulator. There should be a hard black plastic vacuum line attatched to the regulator. Now for the tricky part, unplug it and crank the car. If the regulator is in fact the problem, this should at least improve if not eliminate your problem. If it does not, my next step would be to check your fuel pressure with a fuel pressure gauge available at Autozone for around $40. A TPI motor needs at least 40 psi to operate properly. Back to the regulator, if it is in fact the problem your going to have to replace the diaphram in the regulator which is somewhat of a pain. You have to pull off the throttle body and upper plenum to get to it. Additionally the FPR is secured with special security torx bits, I believe its a T5. The plenum runner gaskets and throttle body gaskets will need to be replaced if they're original. If you're not somewhat handy I would suggest taking it to a shop to do the job.

Aug 10, 2008 | 1989 Chevrolet Corvette

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