jponfrank Posted May 2, 2007 Share Posted May 2, 2007 New to the club.I just bought a 1989 Comanche with 68,000 miles. I noticed the vaccum line going to the fuel pressure regulator is plugged. I hooked it back up and it started shaking really bad and stalled. Is that a sign of a bad regulator. Also the truck runs rough. Could that be a reason why the truck runs a little rough. It is a 4.0 2wd. Thanks Joe. Link to comment Share on other sites More sharing options...
HOrnbrod Posted May 3, 2007 Share Posted May 3, 2007 New to the club.I just bought a 1989 Comanche with 68,000 miles. I noticed the vaccum line going to the fuel pressure regulator is plugged. I hooked it back up and it started shaking really bad and stalled. Is that a sign of a bad regulator. Also the truck runs rough. Could that be a reason why the truck runs a little rough. It is a 4.0 2wd. Thanks Joe. Best way to check is with a pressure gauge on the fuel rail Schrader valve. Fuel pressure should read about 39 psi w/o vacuum; 31 psi w. vacuum. Since it only runs decently at the higher pressure w/o vacuum, your regulator could indeed be bad. Link to comment Share on other sites More sharing options...
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