Quick video showin fuel pressure help

[Sidewinded_idi]

i know my lift pump is very old I want to replace it soon but I just installed a gauge and it seems to have good pressure but can you tell me if it's normal for it to fluctuate so much. I know it's pumping off a cam lobe I just always seen even my gassers a lot steadier

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[DaveBen]

I had that on a Kenworth truck I owned. It was the gauge. They are internally dampened and will move that much when to dampener does bad.

 

[Sidewinded_idi]

The gauge is brand new? Could still be bad I guess

 

[Thewespaul]

Had the same gauge on an electric fuel pump and it did the same thing, replaced with water filled jegs gauge and it went away

 

[towcat]

this is what I used for diagnosing a suspected supply side issue. no vibrating needle here. slight overkill since it's a gauge for high psi work, but still it's great for blind mechs.

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[riotwarrior]

Ya my old school tester is same big ass guage...we ahem older blinder handsomer fellas have the good stuff

 

[papadiesel]

yep normal 4-7 lbs working, if over 100,000 or 15 years, id replace, they are not that expensive

 

[Sidewinded_idi]

So I just changed my lift pump. Wanted to show an after video of the fuel pressure difference. Now it’s steady where before it bounced. I noticed a bit more power and more smoke. I knew my old one was going out as on big hills my filter light would come on

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[Hydro-idi]

Be careful with those filter head mounted gauges. Had a cheap one on my rig and it lasted about 10 hours. Left me stranded on side of road in middle of nowhere after it broke & spewed about 10 gallons of diesel all over engine compartment. Scary stuff and can’t believe it didn’t ignite.

 

[Sidewinded_idi]

Thanks for the heads up, I’ll definately be keeping an eye on it