Fuel pressure - PowerStrokeNation : Ford Powerstroke Diesel Forum
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post #1 of 7 (permalink) Old 05-07-2019, 10:58 PM Thread Starter
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Fuel pressure

So I have a 1997 f250 7.3 is it normal for the fuel pressure to bounce around?
It steadily bounces from 55psi to 60psi.
And you can feel it in the idle of the truck the whole truck seems to bounce at an idle with the trans in park. But the tach stays steady. I have a video but can figure out how to load it.

1997 f-250 super cab long bed 4x4 215,000 miles
All stock.
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post #2 of 7 (permalink) Old 05-07-2019, 11:10 PM
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Fuel pressure

Yeah thatís the nature of a mechanical pump.


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1995 Crewcab XLT 4x4 7.3, E4OD, 3.55, TS 6 chip, RiffRaff air filter.
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post #3 of 7 (permalink) Old 05-07-2019, 11:21 PM Thread Starter
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Re: Fuel pressure

Is it normal for the idle to pulsate along with the fuel pressure?

1997 f-250 super cab long bed 4x4 215,000 miles
All stock.
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post #4 of 7 (permalink) Old 05-08-2019, 01:04 AM
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Re: Fuel pressure

No, it shouldn't pulsate at idle. Maybe clean the screen between the filter bowl housing and the fuel pressure regulator. Cheers!
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97 F250 SC 4x4, E4OD, 4.10 LS, Basically Stock, Relocated Block Heater Plug, Ext Trans Filter, Tru-Cool Max, I/C Mounted but not Plumbed

SOLD: 94 F350 CC DRW PSD, 5 Speed, 4.10 LS, SBC Con-O, Baldwin Filter, Tymar HPX Hose, 3Ē DP, Bilsteins, $12 AIC, Coolant Filter, Explorer O/H Console, Trans Temp, Boost, and Pyro, Pedestal Mod, Gutted EBPV
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post #5 of 7 (permalink) Old 05-08-2019, 02:44 AM Thread Starter
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Re: Fuel pressure

Thanks.

1997 f-250 super cab long bed 4x4 215,000 miles
All stock.
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post #6 of 7 (permalink) Old 05-16-2019, 03:10 PM Thread Starter
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Ok so I cleaned the screen in the fuel bowl with no change to the idle.
It seems with a small amount of load on the engine at idle, a/c on it seems to idle smooth.

I took the truck on a trip this weekend and averaged 19.5 mpg truck ran great.
But still has a bouncy idle if you are sitting in the truck in park the whole truck just kinda bounces

I did a buzz test and a cyl contribution test everything came back fine. Fuel pressure is 58-60 psi but the fuel pressure seems to bounce between 55-60 psi and the bouncy idle seems to follow that swing in fuel pressure.

I’m at a loss just looking for some guidance.
The tach holds steady while idling.
Thanks in advance for any help.

1997 f-250 super cab long bed 4x4 215,000 miles
All stock.
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post #7 of 7 (permalink) Old 05-16-2019, 04:48 PM
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Re: Fuel pressure

When I use Hot Shot Secret in my oil changes my idle smooths out...maybe try that.

1996 F350 Crewcab lb 2wd auto, tommylift, now over 451k, 355k 3/31/15

1991 F250 Xtracab lb 2wd auto, sold again! Driveline and chassis is under a '65 F350 cab

1965 F100 styleside, power brakes, front discs, 390 all the goodies
2015 F250 CCSB 2wd gasser auto
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