1 Fuel Pressure Regulator FPR Wed Apr 03, 2024 11:17 pm
davemadsen
Silver member
1987 K100RT
How do I test/troubleshoot the FPR? I’m on this quest to resolve a bit of rough acceleration and sub-par fuel consumption (35-38 mpg US driving like the old man I am). Thus far:
Temperature sensor tests good (2.5k ohms at 66°F)
FPR holds vacuum (ie vacuum line and FPR diaphragm function as expected)
No visible fuel leaks at FRP
Fuel filter good, no restrictions
Fuel pressure: 32 psi (low)
Fuel pressure with fuel hose between FPR and fuel rail (return line?) clamped: 80 psi
What else should I be checking before throwing money at the problem?
Dave
How do I test/troubleshoot the FPR? I’m on this quest to resolve a bit of rough acceleration and sub-par fuel consumption (35-38 mpg US driving like the old man I am). Thus far:
Temperature sensor tests good (2.5k ohms at 66°F)
FPR holds vacuum (ie vacuum line and FPR diaphragm function as expected)
No visible fuel leaks at FRP
Fuel filter good, no restrictions
Fuel pressure: 32 psi (low)
Fuel pressure with fuel hose between FPR and fuel rail (return line?) clamped: 80 psi
What else should I be checking before throwing money at the problem?
Dave
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Dave