2013 Fuel Pump not running?

[Wheel House Motorsports]

Have a 2013 Pro in the shop that has us stumped, looking for some other input!

300 miles on the sled, ran great before we did some work. Tank was removed and reinstalled, but that is it, never touched the fuel pump besides unplugging it and taking the tank off.

Now what we are seeing is, 14v on the fuel pump side of the connector, good continuity to the ground on the sled. Problem is fuel pump isnt running, but if I apply 12v via a battery to the primer plug above the primary in the wiring bundle it will run the pump fine and the sled runs great.

SO somehow I can have power at the pump but it wont run the pump, but If I feed battery power from downstream on it, the setup works.

Very perplexed, anyone got any ideas?

Thanks!

 

[tuneman]

Failed voltage regulator? Sled is sending 14v AC instead of DC?

 

[kanedog]

I tried a mtntk ac-dc rectifier to switch the electrical load to the ac plug. Sled wouldn't stay running and ran on half a cylinder. I back tracked worked done, disconnected from ac power and connected back to dc. Problem solved.
Mtntk rectifier now has permanent spot on bench.

 

[Wheel House Motorsports]

Setup a Silber reflash turbo kit on the sled, but aside from swapping to larger injectors, nothing changes electrically on the sled, no power draws added. So really perplexed what we have going on with it.

 

[BJorgy17]

I am dealing with a similar issue on my 15 pro with 450 miles right now too. Fuel pump runs fine when connected to 12v power via the connector above shock tower. However will not fire. I have replaced my fuel filter and that has changed nothing. Did you have it connected to 12v running the pump and try to start it? I am currently in the process of testing my fuel pressure with a gauge on the return line, hopefully that will show if its sending 50-60psi (service manual specs).

 

[mountainhorse]

gut tells me that you dont have enough current under load.

Swap out the regulator then ECU from similar sled.


You have a bunch in your "tribe"... right???


.

 

[diamonddave]

Nick when you say you have 14 volts at the fuel pump connector, is that taken from both leads at the connector? Pos and neg? Or is your meter taking a ground from somewhere else?

I would try cleaning the laughable wad stack of ground wires at the bumper and recheck.