Engine/Transmission (1998.5 - 2002) what is the lift pupmp PSI out put 2002 in tank pump

[SDozier]

I have a 2002 5. 9 and have had the lift pump up graded to the in the tank type, I am seeing about 8 PSI on the test gage. What is the PSI out put and is there some place to find such information?

 

[Sticks]

That is about right for new. Give it a month and you will likely see 4 psi, and drop to a vacuum at WOT. My advice, put the Carter block mounted pump back on in series with the in tank pump. Just remove the aluminum block they put in it's place, and you will have to splice in some wiring to run the pump off the relay for the in tank pump.

 

[chazj]

I also had the intank pump installed. Was about 8 psi at idle and easily dropped to ZERO under light acceleration.
Ended up with the FASS 95 for the last 100 k... . and counting.

 

[PSpychalski]

Same here... 8psi idle... . 0 psi wot. installed FASS DDRP on frame rail forward of the tank. Now it's 18psi Idle 11psi wot pulling 12,000lb trailer.

 

[WDJeffcoat]

In Tank Question 98.5 3/4 Ton

I am getting about the same results as you are, 8psi normal, WOT drops to below 4psi with low pressure light 4psi blinking and electric SW Gauge reading below 4psi. This is a 98.5 24V and replacement in tank conversion.

You mentioned removing the aluminum block they put in the on block, is that not just a splice thru where the stock Carter was? If so, why remove it?

Also, would I just splice into the wires going to the in tank pump and could/would this draw to many amps on that supply wire, or would need to go all the back to the fuel pump relay and if so, is that in the fuse box on driverside fender well? If the is the case, wire color code would help.

Sorry to be so long winded but am afraid to pull a load. Dealer says no problem, same ole story, in tank puts out more volume so VP44 would be happy, SURE!!
Truck is stock with 102,000 miles, 3/4 ton, extended cab

Thanks!
W.D.

 

[WDJeffcoat]

Frogot, If I put an external pump in line, inside frame, will it pull O.K. thru the in tank stock pump, I do not look forward to doing the draw straw thing.
Again, Thanks!
W.D.

 

[Sticks]

Loose the aluminum block where the carter pump is supposed to be, and put the carter back in. 2 pumps running in series, and one will still pump if the other goes tango uniform.

 

[WDJeffcoat]

Well, quess I ask the question improperly: My question is, Has anyone put a secondary pump inside frame to help the intank pump boost its meager 8psi ??

If installing a secondary pump, ie Carter or whatever, will the stock fuel pump relay carry the Amps O.K. or do I need seperate wiring for secondary pump??

And will the secondary pump draw thru the stock intank put without all that drawstraw stuff?

Maybe this subject has been beat to death somewhere else on the forum?? )
Thanks!!
W.D.Jeffcoat

 

[Road Dog]

I don't think there is a fuel pump relay. It's driven directly by the ECM so when it goes it's time for a new ECM. Some people add a relay and fuse to protect the ECM.

 

[Sticks]

Well, quess I ask the question improperly: My question is, Has anyone put a secondary pump inside frame to help the intank pump boost its meager 8psi ??

If installing a secondary pump, ie Carter or whatever, will the stock fuel pump relay carry the Amps O.K. or do I need seperate wiring for secondary pump??

And will the secondary pump draw thru the stock intank put without all that drawstraw stuff?

Maybe this subject has been beat to death somewhere else on the forum?? )
Thanks!!
W.D.Jeffcoat

.... My advice, put the Carter block mounted pump back on in series with the in tank pump. Just remove the aluminum block they put in it's place, and you will have to splice in some wiring to run the pump off the relay for the in tank pump.

No need to try to mount something on the frame. Just get a OEM carter pump and mount it where it's supposed to belong. The in tank pump kit that the dealer installs includes a relay, so the ECM is now just turning on the relay. Follow the wire that used to go to the block mounted pump, and it will lead you to the realy. The relay output wires go to a connection block behind the drivers front wheel well. Those are the wires you will need to splice into to power the carter, or any other 12v pump you choose.

Yes it will draw through the other pump if it dies, and the strainer sock in the tank.

 

[WDJeffcoat]

Well Sir, I owe you a cup of your favorite drink for the information, will do just that as you suggested.
Thanks!
W.D.Jeffcoat

 

[Sticks]

Drinking it now.

Didn't mean to come off as an arse.