Engine Not Getting Fuel

misterscalper

New Member
May 20, 2021
4
0
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Ride
2015 F36 N55
Last week, I upgraded my LPFP to a Walbro 525. After the install, I was able to go run errands in the car for a few hours. While parked, the motor stalled. I was able to get it running again but a handful of minutes later, it stalled again. It finally gave up starting all together.

After a tow home, I put the OEM LPFP back in. Still no dice. The EKP was super hot so I thought I may have toasted it with the extra draw from the Walbro. Visual inspection of the circuit board showed no outward signs of damage.

I ordered another OEM fuel pump and EKP. None of which resolved the issue.

Two things that stand out.
- When I disconnect the line from the fuel rail on the motor, there is zero pressure.
- When I disconnect the line on top of the LPFP bucket, there is a lot of pressure.
- Zero codes.

I was extremely careful in my LPFP replacments and am confident nothing went into the tank.

I am at a loss and could use some tips on how to troubleshoot this further.

2015 F36 N55
JB4 + Burger E85 BEF
 
Last edited:

misterscalper

New Member
May 20, 2021
4
0
0
Ride
2015 F36 N55
Pulled the line off the rail and started it. No fuel at all.

How can the HPFP pump fail when replacing LPFP?

Is there any other thing to check that controls the HPFP? I pulled all my fuses and none were bad.
 

Dumaurier7

Lieutenant
May 19, 2020
532
208
0
Sound like your problem is between the tank and the motor, check the fuel line for kinks or blockages.