Erratic fuel pressure
Laughing Gas
Joined: Jan 2012
Posts: 1,103
Likes: 1
From: Lakeland, TN
Needs filters. Last change 36k ago. Recently did the Blue Spring upgrade. I spoke will ISSPRO yesterday and they weren't that surprised that it fluctuates as it reads 1000x per second. However, you and most others that run them seem to feel it should be steady. One thing that ISSPRO suggested was to turn to key on and engine off position and see if it is stable. It is, and they say it isn't the gauge then, and that it is just reporting what is actually happening in the bowl. Thinking I'll do the filters and then reassess.
MMNC (SS)(Ret)
Joined: Mar 2004
Posts: 11,602
Likes: 148
From: SE Georgia
damn, filters are due every 10k or every 2nd oil change
change those puppies out.
the gauges may read 1000 times per second. cool. but it should see the same value consistently when at level RPM and no speed/rpm variances.
change those puppies out.
the gauges may read 1000 times per second. cool. but it should see the same value consistently when at level RPM and no speed/rpm variances.
Laughing Gas
Joined: Jan 2012
Posts: 1,103
Likes: 1
From: Lakeland, TN
Changed them out, but no change. Starting to believe all is well since the gauge readings, while not rock steady, always seems appropriate to the situation and always stay between 60 and 64. Unless you have other thoughts, I'm just going to start being happy. Full disclosure: I wasn't happy on the first day when it WAS rock steady, as I believed it was yet another dummy gauge like the ones on the dash. Seems you can't make me happy.
Junior User
Joined: Aug 2005
Posts: 65
Likes: 0
From: Atlanta
I have had the same problem for a couple of years. I have researched this forum and others and I haven't found a final solution. I even hooked up a mechanical gauge and saw the same fluctuation. I have an electric sender and a DashDaq for monitoring and my fuel pressure still fluctuates. I came to the same conclusion as you. I electronically filtered the signal with the DashDaq so the fluctuation so it wouldn't bug me. I did see one post where one fellow changed his fuel pump and the problem went away.
Laughing Gas
Joined: Jan 2012
Posts: 1,103
Likes: 1
From: Lakeland, TN
I have had the same problem for a couple of years. I have researched this forum and others and I haven't found a final solution. I even hooked up a mechanical gauge and saw the same fluctuation. I have an electric sender and a DashDaq for monitoring and my fuel pressure still fluctuates. I came to the same conclusion as you. I electronically filtered the signal with the DashDaq so the fluctuation so it wouldn't bug me. I did see one post where one fellow changed his fuel pump and the problem went away.
Mountain Pass
Joined: Feb 2011
Posts: 192
Likes: 30
From: Upstate NY
Subscribing.
I also have the fluctuation and like wgcdc and I've been averaging the reading over 1.5 sec on a dashdaq to keep it steady. Mine was also verified using a mechanical gauge.
I'm still under warranty, but do not see the dealer doing anything unless it throws some sort of code. Are there codes for the fuel pump?
I also have the fluctuation and like wgcdc and I've been averaging the reading over 1.5 sec on a dashdaq to keep it steady. Mine was also verified using a mechanical gauge.
I'm still under warranty, but do not see the dealer doing anything unless it throws some sort of code. Are there codes for the fuel pump?
Laughing Gas
Joined: Jan 2012
Posts: 1,103
Likes: 1
From: Lakeland, TN
Subscribing.
I also have the fluctuation and like wgcdc and I've been averaging the reading over 1.5 sec on a dashdaq to keep it steady. Mine was also verified using a mechanical gauge.
I'm still under warranty, but do not see the dealer doing anything unless it throws some sort of code. Are there codes for the fuel pump?
I also have the fluctuation and like wgcdc and I've been averaging the reading over 1.5 sec on a dashdaq to keep it steady. Mine was also verified using a mechanical gauge.
I'm still under warranty, but do not see the dealer doing anything unless it throws some sort of code. Are there codes for the fuel pump?
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Laughing Gas
Joined: Jan 2012
Posts: 1,103
Likes: 1
From: Lakeland, TN
Subscribing.
I also have the fluctuation and like wgcdc and I've been averaging the reading over 1.5 sec on a dashdaq to keep it steady. Mine was also verified using a mechanical gauge.
I'm still under warranty, but do not see the dealer doing anything unless it throws some sort of code. Are there codes for the fuel pump?
I also have the fluctuation and like wgcdc and I've been averaging the reading over 1.5 sec on a dashdaq to keep it steady. Mine was also verified using a mechanical gauge.
I'm still under warranty, but do not see the dealer doing anything unless it throws some sort of code. Are there codes for the fuel pump?
Laughing Gas
Joined: Jan 2012
Posts: 1,103
Likes: 1
From: Lakeland, TN
Well that's 2 unsteady on a mechanical gauge and 1 steady. I don't know about mine since I don't have a mechanical gauge. I'm working on a homemade snubber as described in the "other" thread. I'm now waiting on the Swagelok people to call me back with a quote.
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