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should a fuel pressure regulator hold vacuum?

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Old 04-29-15, 09:44 PM
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should a fuel pressure regulator hold vacuum?

I apply 25-30 PSI vacuum via hand pump to the fpr and it very quickly resets to 0 PSI. Is this normal or should it hold a steady vacuum?
Old 04-29-15, 11:10 PM
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needs to hold vacuum
Old 04-30-15, 05:32 AM
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I bet this explains a lot. 14mpg. Wet plugs. Lumpy idle. Any chance someone has a know good SE unit? 84-88 is all the same right? Guess Ill start a wanted thread.
Old 04-30-15, 07:17 AM
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Rockauto has em: More Information for STANDARD MOTOR PRODUCTS PR29
Old 04-30-15, 06:08 PM
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Well there was either a leak in the hard line or a leak in the pressure solenoid because I connected a vacuum line from the FPR straight to the dynamic chamber and problem solved. I re-tuned the idle and took it for a 5-6 mile drive. Drove perfectly and no more wet plugs and steamy exhaust. Hopefully the 14 MPG issue is resolved as well. Basically how it was before the fix is 1) a vacuum leak at the dynamic chamber, and 2) no FPR. No good. It even sounds better rolling through the gears too. I had to turn the variable resister about 2mm towards L.
Old 05-02-15, 12:11 AM
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Glad you got it sorted out!
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