Engine/Transmission (1994 - 1998) Fuel Pressure??

[Cummins360]

Hi I have a 95 12 valve and I have a mechanical fuel pressure gauge with an isolator and a pressure snubber that is plumbed directly into the banjo bolt that feeds the injection pump fuel. NOW the maximum pressure I ever see is 20 psi at cruse is that what it is suppost to be??? The truck runs perfect and never skips a beat but I read the latest TDR issue and they said it should be like 40 something psi. Someone please clear this up for me.

-Travis

 

[DDennett]

According to my factory manual your fuel pressure should be 17-22psi at idle and 25-30 psi at 2500 rpm with no load. So if your truck runs fine I would think you have no issues... but of course I am no expert, although I did recently spend quite a bit of time troubleshooting what I thought was a fuel pressure problem.

 

[Joe G.]

20 PSI running down the road is low. It should be close to 30 PSI. Idle should be at least 18 PSI. 25 PSI at speed is ok, but a little lower than I like. I replaced the overflow valve recently because it failed. My cruise is at least 40 PSI now. You can check your overflow valve pretty easy. The spring should be a little bit over a half inch, . 550". If it is shorter you can stretch it a little bit. Be careful if you do that, because too much will wreck the spring. If stretching it increases your pressure then you need a new overflow valve.