Fuel Pressre odd after Banjo install

[smuesse]

About a two months ago I installed a blue spring and fuel pressure gauge. My pressure would hold around 64 and drop under acceleration. This past weekend while doing my oil cooler job, I installed the 6.4 Banjos. Now my fuel pressure bounces around. When idling it will jump around 62,63,65,64... and when driving it will bounce around from as low as 45 all the way up to 72 then will settle back around 62 & 63. The bounce around only happens for a couple seconds, but it happens several times in a short trip. Before the Banjo install the pressure would stay pretty steady. Could my fuel pump be going crazy over this new found freedom, lol. My pressure gauge is hooked to the extension hoes that runs form the fuel bowl to the fender then the sending unit is attached to the hose. Could this be a bad fuel pressure sending unit? Any ideas.

[dannyboy950]

Guite possibly. Try checking fuel pressure with a mechanical gauge at the filter houseing and see if it actually is fluctuateing. You did get the copper gaskets seated correctly on those banjo's right.

[smuesse]

They are seated. There are no fuel leaks.

[smuesse]

I have the hose set up from strictly diesel that has the test valve on it, ill test the fuel pressure manually when I get home.

[michaelaiman]

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[smuesse]

I tested it with the manual gauge and it holds steady at 64. Then after I checked it, my digital gauge started working fine. I must have had a little more air in the line for the sending unit. All is good now. Thanks for the tips.