Fuel PSI Rhythmically Drops

[firefighterwhite89]

I install a Fuel Pressure Gauge about a week ago, and I noticed today going down the interstate, at 60% Throttle in fifth gear the fuel PSI was 40 but kept rhythmically dropping ever 2 seconds about 2 PSI...Is this a sign the Fuel Pump is going out slowly?


I wouldn't attribute this to the FPR or Filter...What could it be? Maybe the gauge ground or power supply is hooked into something that's causing it to pulse?

[cygnus x-1]

Eh, I wouldn't worry about it. That's only a 5% change in pressure which isn't that much. And since it only happens under those conditions it's probably just some kind of resonance phenomenon.

C|

[AccordB20A]

could be anything. the solder joints in your main relay even or your alternators regulator

[Dr_Snooz]

My guess would be that's when the pump actually pumps.