Engine/Transmission (1998.5 - 2002) In tank fuel pump

[phantomusa]

I'm going to be replacing my 2002 2500 in tank lift pump with a external Airdog lift pump and a bottom sump feed to new pump
My question is how do I disable my in tank pump and still keep power for my fuel sender
Also how can I find power for the new Airdog pump I under stand it's controlled by the ECM I've looked where the engine mounted pump would go and didn't see any type of power plug I would like to use a factory type setup rather then powering the Airdog from a toggle switch...or should I use the power to my in tank pump plug and route it to the Airdog ???
And last question this new pump is mountable where the Carter pump would go but I would prefer to mount it under my truck bed which way is best ???
Pappy
(I haven't gotten the new pump yet should be here after Xmas just tryin to get my ducks in a row)

 

[hcole]

It's been a while since I did mine but I'll give you my experience. First, the fuel sender is on separate wiring from the intank pump. I believe it is only one plug so you can just abandon the power wire to the pump.You can find the wire color for the pump and trace it back to the conversion plug under the hood where the original pump mounted. Do NOT mount the air dog where the original pump was. Mount it on the rail close to the transmission cross member. This pump is built to push, not pull fuel. It will work much better that way. It is always flooded with fuel. Then mount a small 12 volt plugin relay off the fender on the driver side battery and use the power wire from the ECM that went to the fuel pump to power the coil of the relay. Now, insert a fuse in line from the battery + through a normally open contact on the relay to the air dog. Now you have the pump load off the ECM and only using the original power wire as a signal to operate the relay. This is a very reliable set up as the original wire to power the fuel pump was not fused from the factory. Hope this helps.

 

[phantomusa]

Hcole that helps a lot I like the ideal of using the pump wire to relay that way I can use heavier wire to power the pump
I'm going to install a sump delivery to pump which I will frame mount under my bed that way it will be a pusher pump
Pappy

 

[hcole]

Well, I'll stay with my location for the pump. If you mount it on a steel plate that spans the chassis right on top of the transmission cross member then it is easily accessible and after you start it up, and it is lower than the tank and it will siphon to the pump. This is by far the easiest place to access it. You can use rubber isolators to keep it quiet. You just cut into the supply line from the tank and insert rubber hoses to the pump. Digging it out from under your tool box is a lot of trouble and it might get damaged by stuff you put in the bed. Sorry, reread your post and maybe you are going to mount it on the rail instead of under the tool box. Sorry.

 

[phantomusa]

Question about rated fuel hose
I'm replacing my fuel hose from tank to lift pump a Airdog R3SBD100 should I use a SAE J30R7 rated hose in 3/8" id or are there other hoses that are usable I do run bio fuel at times but mostly just fuel up with pump diesel
I've been searching the interweb till my mind is numb and found hose from .99 cent a foot to 5.99 cent a foot and so far this sae spec hose is something I can get from NAPA for less then $.99 ft which is within my budget
Any reason not to use this hose ???

 

[phantomusa]

Guess i got my answer about fuel hose when to NAPA and talked to counter parts person that knew his stuff and got the correct hose

 

[BajaBuilder]

ive got a question and sorry to have to ask here. did not mean to hijack your thread. just running out of solutions etc. does the same electrical line that powers your in tank pump also power my lift pump? i have a 1999 dodge with the vp44 and fass lift pump/ stock pump and new cummins pump. all do this: truck runs fine at idle but going down the road fuel pressure drops to zero. sometimes the truck runs rough if ran long enough. my fedex diesel mechanic friend and i installed the replacement sending unit with pump from ORielly's and it plugs in fine but pump isnt running. on the sending unit there are 4 wires for the 4 prongs so we figured it would have power to it but the pump doesnt run. thanks and happy new year to all

 

[phantomusa]

If you have a fass external lift pump you can't operate it inline with a internal tank pump there would be resistance to fuel flow from the intank pump you need a free flowing supply of fuel .... In other words don't use both pumps use either internal or your fass external pump
Like my setup will be to leave the intank pump in place and I'm adding a airdog external lift pump but I'm also doing a bottom sump draw to supply the airdog with fuel and bypassing the internal fuel pump altogether

 

[BajaBuilder]

Hey Phantom, thanks for that info and gl with your project

 

[JR]

ive got a question and sorry to have to ask here. did not mean to hijack your thread. just running out of solutions etc. does the same electrical line that powers your in tank pump also power my lift pump? i have a 1999 dodge with the vp44 and fass lift pump/ stock pump and new cummins pump. all do this: truck runs fine at idle but going down the road fuel pressure drops to zero. sometimes the truck runs rough if ran long enough. my fedex diesel mechanic friend and i installed the replacement sending unit with pump from ORielly's and it plugs in fine but pump isnt running. on the sending unit there are 4 wires for the 4 prongs so we figured it would have power to it but the pump doesnt run. thanks and happy new year to all

I didn't catch this in your other thread but if you are trying to pull fuel through the in tank pump with your FASS that is at least part of your problem. You need to choose which one you want to run and eliminate the other. Something like this would get rid of the in tank pump.
https://www.genosgarage.com/product/vulcan-ds5/fuel-system-accessories-replacement-parts

If you updated your truck to the in tank pump and wish to go that route (I wouldn't, but that is personal preference) I believe there is a harness you have to run to the back to power the pump. You could check with a dealership on that to be sure. As far as I know there aren't any aftermarket solutions for this but I could be wrong.

This video briefly explains why you can't pull fuel through the in tank pump. They show you how to remove the checks to get by but the right way to do it is to install a draw straw or something similar.

https://www.google.com/url?sa=t&sou...RypO5-XnBHIcLmgSA&sig2=DCIIsSBy-qGsISWUJI062Q