montemorris

I just had my 01 2500 in for an oil change and general check up today. The mechanic questioned my fuel pressure (I have an isopro gauge) which is at 7-8 psi at idle. No one in the shop thought that the psi should be that low.

I'm on my 3rd lift pump; the last one has lasted 70,000 miles since they put it in the fuel tank instead of under the hood. This was maybe 5-6 years ago. It was installed by a Dodge dealership and they told me that I would notice that my pressure would be only about half what it was before when the lift pump was under the hood. They were correct as I immediately saw 7-8 psi at idle and sometimes down to 4 psi when towing a fifth wheel.

It seems that the Dodge dealership that installed this last lift pump said that there had been a technical service bulletin about the old lift pumps and that they should now be installed in the fuel tank.

Question. Was the dealership that installed the pump correct that the pressure SHOULD be that low, or are the current mechanics correct that it should NOT be that low? The truck runs fine since the installation, but should I be worried that the injection pump is not getting lubbed? I'm NOT very mechanically inclined, therefore in the dark about this. Thanks.

simplysmn

Well this is the First gen area but from what I have Read your fuel pressure is Way to Low should be 14-15 at idle ?????

mknittle

That low would worry me. especially knowing that low lift pressure can kill the injection pump.

HMX-1

Should be no more than 20 psi at idle, optimal is 12 to 16. At wide open throttle, it should be no less than 8 psi.

You're definitely on the low side.


-Kris

oliver foster

I have a Air Dog lift pump on my '01
20 PSI at idle
If it gets below 15-16 PSI at WOT I know it is getting time to change my fuel filter.
With a fresh filter I can't get it below 17 PSI no matter what I tow or how I drive it.