Join Date: Mar 2008
Location: placerville, ca
high pressure is caused by a bad regulator or a kink or restriction in the fuel return line.
High fuel pressure will make it run rich like yours is.
To isolate the cause of high pressure, relieve system pressure and connect a tap hose to the fuel return line.
Direct the hose into a container and energize the fuel pump.
If fuel pressure is now within specifications, the fuel return line is blocked.
If pressure is still high, the new pressure regulator is faulty.
High pressure is usually caused by a bad pressure regulator or when a pressure return line to the fuel tank is kinked.
When there is a vacuum line to the pressure regulator, part of the procedure is to pull the vacuum hose off while the engine idles.
The pressure should rise about 8-10 psi in most systems when the hose is pulled.
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Last edited by bigsquat; 12-17-2008 at 09:36 AM.