Testing Fuel Pressure Regulator

[chiefmd]

Is there anyway to check a fpr off the car? I was thinking about drawing a vacuum with a vacuum pump and checking to see if there is any leak down over a period of time. I would think that the fpr should hold the vacuum. If it didn't would that indicate a leaking fpr? Thanks

[Carl Beck]

Just go buy an inline fuel pressure gauge, they don't cost much - and put it on the outlet side of the fpr. Most fpr's work by pushing a spring up to allow fuel flow.. I don't think pulling a vacuum on one would tell you anything useful..

[sblake01]

All three sides should hold a vacuum. But, as Carl said, I don't think that's a definitive test.

[bobs77]

Just go buy an inline fuel pressure gauge, they don't cost much - and put it on the outlet side of the fpr....

Carl--shouldn't the gauge go between the filter and the inlet to the fuel rail?