2nd Gen Non-Engine/Transmission lift pump pressure

[JKClark]

Stock 01 4 X 4 with automatic transmission. Gauges have recently been installed. The orginal lift pump shows 7 PSI at idle but it goes down to 2/3 under a load. Is this "normal"? A diesel mechanic neighbor (services school busses) says it's normal to lose pressure when acellerating.



However, the local Dodge dealor said this is an indication the pump is failing and suggested they install an after market in-tank lift pump in to the tune of $1200.



This truck has an extended warranty and the same dealor, Larson Dodge of Puyallyp, WA, claims replacing the lift pump is not covered.



Seeking feedback as to whether it's normal to lose fuel pressure when accelerating.



Thanks, John

 

[B.G. Smith]

It is normal for the pressure to drop on hard acceleration and wot. It is not normal for it to go that low. I guess it depends on the extended warranty you have and for sure the dealers are different but mine was replaced under the 100,000 mile engine warranty at no charge to me. It was a 99 model and the in-tank unit had not come out at that time. bg

 

[Missouri Mule]

Don't know about 2-3 under load though it sounds low but 7 at idle is low it should be 14-16 at idle.

 

[DVR]

your pressures are too low. you need a lift pump.

even if they cover it you will get an in tank pump.

go to the cummins dealer and get a new lift pump like the one you have.

search for the school bus/emergency service vehicle recall lift pump #. i buy those for $64.



the in tank pump does not make much more pressure than what you have. it would be tough to swap on the side of the road too.



you can also search info on the in tank pump. there has been some discussion about it.

 

[02cummins]

sounds like lp going south, at wot I have 12lbs stock lift pump 57,000 miles I just relocated the lift pump using vulcan set up, I would recommend it also don't go in tank pump. just relocate it on the frame rail. It will be very easy to change if needed.

 

[JKClark]

Thanks for the reply. Meanwhile I'm investigating the FASS system.

 

[JKClark]

Thanks for the advice. I'm also looking into the FASS system but I'll also see if a local Cummins dealor has in replacement pumps. Sounds like you've purchased more than one lp is this correct? And does this mean each replacement is only good for so many miles? Assume you watch your gauges and replace as needed. John

 

[JKClark]

Is the Vulcan kit the one sold by Geno's Garage? Anything tricky about doing the relocate if I decide to go this way?

EG does one have to drain the fuel tank?

Any problem in cutting the wrong line? I see there are three lines near each other. Assume the fule line is the larger, lower line is this correct?

Thanks, John

 

[steved]

Thanks for the advice. I'm also looking into the FASS system but I'll also see if a local Cummins dealor has in replacement pumps. Sounds like you've purchased more than one lp is this correct? And does this mean each replacement is only good for so many miles? Assume you watch your gauges and replace as needed. John

While I am completely satisfied with my FASS and highly recommend them, there is also the Glacier Walbro kit , the Airdog, and the RASP as alternatives as well...



steved

 

[DVR]

i have purchased more than one pump. if your truck is still under warranty- i would not do anything but replace the existing lp with another one in the same location. otherwise you may have some trouble with the dealer if you need warranty service.

it is simple to replace. just change it.



if dodge has a lift pump it will be the same one cummins sells for 50-100% more money.

 

[WestTN]

The latest lift pump with internal bypass and relocated via the Vulcan Relocator kit from Geno's is giving me 14. 5 psi at idle and 13. 5 psi at full throttle and 27 lbs boost. Losing all ofthe banjo fittings are the secret to the much improved delivery pressure.

 

[VHolloway]

look into the fass II pump that the way to go

 

[02cummins]

If you don't have the money for fass pump or are not planning to bomb the truck, I would recomend the stock pump only because you can buy them at your cummins dealer, just incase that unfortunate happens. the vulcan system is very easy to install and you do not need to drain the tank just make sure it is not plum fool either, I keep a spare lp with me just in case, I will be ready. also the vulcan kit comes with very easy instructions so you don't cut the wrong line. they will explain everything.