Thread: Fuel pressure regulator question
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Old 10-15-2007, 08:39 PM
olddog olddog is offline
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Default Fuel pressure regulator question
My fuel pressure regulator is the type that has a vacuum line connected to it. It is a Mallory model 4305M. It is supposed to lower the fuel pressure 1 psi for every 2" of vacuum.

I put a hand vacuum pump on my fuel pressure regulator. The pump is the type that you can use to bleed your brakes. The regulator will not hold vacuum for more than a second. Pumping as fast as I can, I can only pull up to 15". Pump is good. Plugged the line and it will pulled 22" in one pump and held it for 5 minutes.

Is it normal for a fuel pressure regulator to bleed off vacuum quickly like this?
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