Engine/Transmission (1998.5 - 2002) Why is this...

[jeepit]

Seems the last 2 times I changed my fuel filter I lose a lb or 2 of fuel pressure. Am I getting air in the line somewhere thats causing this or what. Truck seems to run the same so there is no change there.

 

[Bschneider]

Where are you testing the pressure? Before or after the fuel filter?

 

[jeepit]

Post filter.

 

[Oasis-3]

PSI drop

I found the same thing happened to me when I changed the fuel filter with less then a full tank of fuel.

I think that changing the fuel filter with a low fuel load is hard on the lift pump when priming the new filter.

Now I fill the tank and change the fuel filter with no more drop in psi.

P. S. I have a gage before and after the filter.



Good Luck

Cliff

 

[jeepit]

I see in another post SNOKING recommended cleaning cleaning pump relay and applying die electric grease. Will try that.