Paul, The fuel pressure should remain in the system for 10 minutes after shutting the engine off. If you have high fuel pressure, the vacuum should be checked because a low vacuum i.e. less than say 10", will produce higher fuel pressure, which is exactly what the pressure regulator is supposed to do. The vacuum source for the fuel pressure regulator should be beneath the power brake booster. Verify that your vacuum hoses are connected correctly, on Models with cruise control, the vacuum hose from the cruise control vacuum pump, near right taillight, could be crossed. Early models the distributor vacuum could be crossed. Verify your system with Bentley page 24.24,a, b, or c schematic of the vacuum distribution system. Some models have the vacuum source for the fuel pressure regulator from the Intake T-fitted to one nipple on the distributor, with the second distributor nipple connected to the Throttle body. It's worth double checking your systems because of the age and number of times this hoses have been removed and refitted or replaced..
I believe you need to have at least 11" to the fuel pressure regulator at the 880 rpm idle, before you fault the fuel pressure regulator as being bad. Also the idle fuel pressure test value is 29 PSI at full vacuum and 36 Psi with no vacuum, above thirty-two with full vacuum would be cause for suspicion. Sincerely, Mark Keller 91 Carat Cowichan Bay, BC |
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