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Old 08-05-2015, 08:53 PM   #1
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Default Fuel Pressure Regulator Vac Hose Disconnected, Car Still Runs

My roommate bought a 1997 Grand Prix se v6 for $700 knowing it had some problems, but it starts right up and drives ok. But it failed smog check. Turns out the former owner removed the vacuum line going to the fuel pressure regulator and crimped shut the regulator where one would connect the vacuum line. Looks like fuel was leaking out there.

Clearly the regulator and hose need replacing but my question is this:

how the heck is the car not having any startup or stalling problems or even running at all with no properly connected and functioning fuel pressure regulator? If we pop a new one in, are we going to cause other problems?

Thank you for any advice or input!

edit: check engine light is on but she'* not yet had car scanned

Last edited by slyjay; 08-05-2015 at 08:54 PM. Reason: addendum
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Old 08-05-2015, 08:55 PM   #2
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I gotta see this. Any chance for pics?
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Old 08-05-2015, 11:51 PM   #3
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I gotta see this. Any chance for pics?
Sure thing. I'll post 'em tomorrow (it'* nighttime now).
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Old 08-06-2015, 08:58 AM   #4
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Assuming the port for the vacuum hose has been plugged, what you describe would cause the car to run rich at idle, which is what caused the emissions test failure. This won't cause the car to not start, or cause it to stall, particularly if the fuel pump is starting to go and pressures are down a little. I can't think of a problem that would be caused by installing a new FPR and hose, but once they were installed I would check the fuel pressure.
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Old 08-07-2015, 08:06 AM   #5
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Thanks you guys!

Hope this photo is clear enough. See how the spout has been bent back around:



It'* supposed to look like this:


Well we gotta put the new FPR and hose on regardless, don't know how we could proceed otherwise.

Yes, that is a thick pool of oil you see below the FPR and rail. You might be seeing more of me ... looks like we're in for some fun with this car haha ...
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Fuel Pressure Regulator Vac Hose Disconnected, Car Still Runs-fpr_zpsrye1efgx.jpg   Fuel Pressure Regulator Vac Hose Disconnected, Car Still Runs-fuel-pressure-regulator.jpg  
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Old 08-07-2015, 09:19 AM   #6
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Fortunately it'* an easy install and a relatively inexpensive part. Let us know what happens.
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Old 08-07-2015, 01:41 PM   #7
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We will probably see a lot more of you if that is their idea of fixing a leaky fuel pressure regulator. Wow.
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