Diesel is essentially a thin oil. I think most of us use oil pressure gauges to test fuel pressure on these trucks. You can get an oil pressure gauge for less than half what that Actron setup cost.
Fuel Pressure Tester
Hello, Well I am just wondering what fuel pressure testers are used on our 7.3's. The reason I ask is because I bought a actron model cp7838. It says never us on a diesel. Now I understand that I will not be connecting to a actual fuel rail like on my 302, but the gauge I have is up to 100 psi and our fuel systems stock should be around 50-55 psi. I guess I am missing something here. Any thoughts. Jeremy
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