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Old 02-25-2011, 06:21 AM
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fuel pressure question

I recently installed my fuel pressure gauge and sending unit. Got everything hooked up and I am seeing 61 psi at idle. Did a WOT run to see what it dropped to, got down to 58 psi. I noticed when the truck shifted the pressure spiked to 88 psi for a split second each time it shifted. Is this normal or have I done something wrong. It only does it when the accelerator is floored. Has anyone else experienced this?
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Old 02-25-2011, 06:25 AM
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Not sure about the spike to 88 psi but it is normal to drop under hard acceleration.
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Old 02-25-2011, 06:31 AM
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Thanks for the response I was pretty sure it was normal to drop a little but the spike for a split second when it shifts has me a little baffled. Not sure why it is doing that.
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Old 02-25-2011, 06:36 AM
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Quote:
Originally Posted by mike125 View Post
Thanks for the response I was pretty sure it was normal to drop a little but the spike for a split second when it shifts has me a little baffled. Not sure why it is doing that.
I know it defuels some during shifting, so maybe after it shifts it allows it to spike. Someone that knows for sure will chime in here and let you know.
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Old 02-25-2011, 07:47 AM
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It is because of the defueling between shifts. The fuel system takes longer to bleed off the fuel pressure than the shift and defuel duration so you see the spike.The HPO also has to bleed down from the 4000+ psi at WOT and being these are fluid dynamics they take time. You probably will also see it spike for a couple seconds when you let off the throttle.
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Old 02-25-2011, 08:34 AM
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Thanks for the info guys as always it is greatly appreciated.
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Old 03-13-2011, 06:14 PM
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how is the quality of the gauge? i assume it the glowshift based on your signature?

which did you get the digital read out or the 7 color gauge ?

also did the sending unit bolt into the test port in the fuel bowl or did you thread it into the cap?
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Old 03-13-2011, 10:21 PM
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I like the gauges. I have the 7 color ones. I got the adapter for the test port and srewed my sender into it. I got a 1/8 in brass street 90 so that the sender cleared easier. It was very easy to install. Hope this helps.
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Old 03-14-2011, 11:35 AM
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hey mike.. im having a problem installing my fuel pressure guage.. i got a adapter, but for some reason. its too large, and i cant find a small one to fit. . the part you put the wrench on is so large it doesnt give me room to clear the bowl.. .any pics of your adapter?.. where did you get it from?.. any info would be greatly appreciated.. thanks..
p.s... i got the autometer adapter.. .
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Old 03-14-2011, 02:38 PM
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I had to sand down the notches where the wrench grabs down at the end where it screws in. Just sand little by little till u get it in there. That fixed my issue
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