kentucky

background-

superchip only run on tow haul
fuel pump replaced at 99,000 miles dealer warranty
lift pump and apps at 170,000miles

driving the other day and the preasure gradually got lower in lower. Usually it resides at 14 or so. it went down to 10 then 8 then 5 then nothing now back up to 4-6 when I start it. There has been absolutely no change in the performance of the truck as far as I can see. I parked it two weeks ago and have only started it to move it around the lot. Checked the preasure with a gauge and it read the same as the truck.

Is this the fuel pump....If so what should I buy... This truck pulls everyday: bobcats, rock, block, snowplowing........

Any Help is greatly appreciated. I'm lost on this one.

kentucky

02 dodge ram 24 vavle. no upgrades.

Shovelhead

Sounds like you're in the same boat as I am....again.

Last road trip I saw the pressure jumping a little, and the WOT pressures dropping a little lower than normal.
Went to drive my truck on Friday evening, fired it up...... ZERO fuel pressure on my mechanical gauge.
Tapped the lift pump with a rubber mallet.... 15 PSI.
Tapped it again..... 20 PSI.
Dead lift pump (armature brushes hanging up) .

My Walbro 392 lasted 3 1/2 years....that's ALOT longer than any of the stock Carter-style pumps lasted.
New pump ordered this morning and on the way ......... waiting for the Big Brown truck.

There are quite a few options available to replace that Carter pump.

It depends on your future mods, and how long you plan to keep the truck.

kentucky

I will be keeping the truck till it cant move, I don't really plan on any future mods as this is a work truck. Just basically need to know what type of pump I need and if I need to take the old one out of the tank or if it can be left in place. When it comes to this issue I have no idea. There are so many different options.

nkennedy

Sounds like it's time for another lift pump. Good time for an upgrade if you have the money.

Shovelhead

First, see if your Lift pump was installed in the tank by a dealer.
The stock Lift pump location was on the lower left side of the engine block, near the starter. (component number 1)


If so, you're in luck.
You can get a replacement stock style pump, or one that fits in the stock location.
Otherwise, you'll need to drop the tank, or lift the bed to get to the top of the tank.

mishkaya

Sounds like your lift pump is going out. There are quite a few options out there...
If you have the in-tank lift pump, Vulcan performance sells a new sending unit with a draw straw already installed. It's not exactly cheap, but with a good aftermarket lift pump, you should be set for years to come. I have had an Airdog installed in my '02 since 2004, with no issues to date. Only fuel filter replacements, and my pressure is always steady at 16 psi.

kentucky

ok so call me dumb but I don't know much about th cummins fuel system so bare with me. In the diagram we just replaced the (figure1) I thought this was considered the lift pump. Now there is another(what seems to be the fuel pump) attached to the top of the fuel tank. When the key is turned on I get no vibration from this, but I do get a noise up on the block wich I thought was the lift pump turning on? There is barely 5,000miles on the new part replaced.

Hope this helps

Thanks for all the input.

Shovelhead

The On The Block lift pump (component 1) is the original location.
As these were failing in increasing numbers, Dodge started a campaign to replace the original lift pumps with an In The Tank pump.
It doesn't seem to last much longer than the engine mounted ones, it's just much harder to replace.
You should have one or the other, but not both.

Just turning the key to the "Run" position should not activate the lift pump.
"Bump" the starter (turn key for a quick second to the start position then back to run) should cause the lift pump to run for approx. 30 seconds.

Make sure you're seeing 13 volts at the pump.
If so, your Lift Pump is most likely shot.
I had 6 dead Carter-style pumps from my 1999 on the shelf in my Garage until I tossed them.

mishkaya

Did you purchase the truck new or was it used? If it was used, someone may have added a holley pump by the tank??? If it was factory work, when they install the in-tank lift pump, they remove the on the block lift pump as Shovelhead has stated. I personally am not a fan of a dual pump setup...

kentucky

These are pics of the top of the tank. If that helps. Nothing moves on this when the key is on, but I assume it would not run until started anyways.

kentucky

bought it used with 17,000miles on it. Gonna check and take a picture of the one on the side of the block.

kentucky

heres the one on the block... just replaced

mishkaya

That is just the fuel sender with it's wiring attached. It would seem you only have the block mounted lift pump. They can be VERY short lived...

kentucky

Bummer. So what is the best replacement for this. I just dropped a butload of money to have this replaced 5,000miles ago.