Fuel Pressure - Fluctuations?
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Elder User
Joined: Sep 2004
Posts: 821
Likes: 1
From: Nashville
Fuel Pressure - Fluctuations?
I finally got around to installing my Isspro EV2 gauges: fuel pressure, EGT, and rear axle temp. Love em!! I had installed fuel pressure regulator upgrade kit back in the summer and my fuel pressure is around 62 psi, so I'm very happy about that, too.
My question is this: the fuel pressure fluctuates up and down 1 or 2 psi once or twice a second. Is this fluctuation typical? If not, could it be from air in my sensor plumbing, or is something else wrong?
My question is this: the fuel pressure fluctuates up and down 1 or 2 psi once or twice a second. Is this fluctuation typical? If not, could it be from air in my sensor plumbing, or is something else wrong?
Post Fiend
Joined: Oct 2009
Posts: 12,123
Likes: 35
From: N. Fort Worth, tx
should be pretty flat and stationary. I have seen a small 1-2 psi bounce with eletric gauges before. even a high quality dvom will do it some times.
also check your ground for the gauge/sender. should be less then .3ohms
also check your ground for the gauge/sender. should be less then .3ohms
Posting Guru
Joined: May 2003
Posts: 1,990
Likes: 1
From: Middleburg, FL
I installed my Autometer fuel pressure guage a few months back and have a 0.5-1 psi fluctuation at idle. Under power it's rock sold steady. I'll check out my ground thanks to Cheezit's post and I'll also attempt to bleed the line to the sender just in case there's some trapped air in the line. Should have already done it but been too lazy of late.
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Elder User
Joined: Sep 2004
Posts: 821
Likes: 1
From: Nashville
Well, I double checked all wiring connections and no issues there. Maybe it's a little air between my sender and the fuel regulator port. I guess I'll try to bleed the sender fitting and see if that makes any difference.
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Hotshot
Joined: Jul 2005
Posts: 13,834
Likes: 25
From: Middle Tn.
1 or 2 psi @ 62 psi, you have nothing to worry about. It may bug you but your way over the 45 psi min. Digitals are awesome but sometimes not as stable as analog.
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Elder User
Joined: Sep 2004
Posts: 821
Likes: 1
From: Nashville
Yeah, I'm very pleased about getting 60 to 65 psi, and I don't mind the fluctuations so long as they aren't due to an imminent problem. Do you think it's just the EV2 gauge being more sensitive, CJ? If I knew for sure it was the gauge then I wouldn't even worry about it. Just want to be sure it isn't due to the fuel pump getting ready to go out or something. Probably not, but thought I'd run it by the forum to see if anyone else has seen this with their EV2 fuel gauge.
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1996, 60, 60l, 73, 87, air, diesel, f150, fluctuates, fluctuating, fluctuation, ford, fuel, powerstroke, pressure, psi
