Lift Pump Wiring - Dodge Cummins Diesel Forum
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post #1 of 9 (permalink) Old 02-16-2009, 04:31 PM Thread Starter
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Lift Pump Wiring

So I'm gutting my fuel system and starting over from scratch..

My question is, when I replace the factory LP, and if I source my power from the battery via a relay and use the LP harness plug positive wire to excite my relay.. will this not trip a code as the LP circuit is open? or does the power going to the relay satisfy the computer in to thinking the LP is in place? IE- Ground the negative from the harness out and tap positive to excite?

See crude MS paint diagram below...

Mopar1973Man must know..





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post #2 of 9 (permalink) Old 02-16-2009, 04:47 PM
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Looks identical to my set-up and it never caused a code.

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post #3 of 9 (permalink) Old 02-16-2009, 04:50 PM Thread Starter
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Quote:
Originally Posted by edcasey View Post
Looks identical to my set-up and it never caused a code.
Where did you ground it out on? I suppose you could just tap the ground into the ground for the new pump?

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post #4 of 9 (permalink) Old 02-16-2009, 05:30 PM
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Mine is a 98.5
In my quest to fix code 1689 I have hot wired the lift pump to the Blower circuit and a additional Grd from pump to batt
As far as codes I do not believe this year of truck records anything on or for the lift pump

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post #5 of 9 (permalink) Old 02-16-2009, 05:37 PM
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Are you asking where the original lift pump ground is grounded to? It's not. This is a relay kit that was on my truck when I bought it. You, of course, could easily make your own. The kit uses an OEM connector with just one pin for the 12volt wire. The ground terminates there.







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post #6 of 9 (permalink) Old 02-16-2009, 10:59 PM Thread Starter
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Okay then, what I'm going to do is just cut the connection off on the lift pump side. Open the connection from the pump and break off the negative terminal, push the wire out of the connector and seal it up. Then just tap the remaining live wire to excite the relay. Hopefully I do not throw the voltage low code for the LP..

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post #7 of 9 (permalink) Old 02-17-2009, 12:24 AM
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you will not

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post #8 of 9 (permalink) Old 03-26-2013, 01:23 PM
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reviving a dead post, but does this work?

i just bought a truck and it still has the original lift pump, but it was bypassed with a giant turd of an electric holley fuel pump, prolly for a gasser

if anyone can follow along my description of the relay

1. ghetto wire from driver side battery to small 4 prong relay on the firewall.
2. one of the prongs is grounded out to the firewall where its mounted
3.another wire coming from the original plug where the original lift pump is (yes still bolted to the block....)
4. last prong has a wire running down the firewall, underneath the truck to where the POS holley is right now.

im guessing this ghetto rigging of wires works by still using the key for signal for the pump to spin?

secondly, the orginal lift pump was simply bypassed, meaning the fuel line was cut and left dangling underneath, while new lines were run from the holley mounted on the frame rail, up to the vp44. is this a correct assumption?

ordered a FASS DDRP and a remote relocation kit. expected to be here in a few days.
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post #9 of 9 (permalink) Old 03-26-2013, 04:55 PM
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and aparently these little relays are not stock equipment...

andy from Geno's garage gave me a call and helped a ton. thank you!

will start a thread and share some pictures!
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