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No power to fuel pumps

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4 replies to this topic

#1
cpthurm09

cpthurm09

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I opened the car up on the highway and after wards (about 20miles later) stopped at a rest area and when I came back the car started and quickly died. The car cranks fine but does not start.

 

The fuel pump is hard wired. I did a continuity check on the lines and there is no power to getting to the fuel pump. I hooked the fuel pump up to a 12v source and it worked. All the fuses checked out good and I replaced the relays for the fuel pump and still a no go. There are two wires running from the main harness that I have not checked (a green and brown running off the main harness down the floor panel). I think they run to the ECU. 

 

I am out of ideas what it could be. If the Hobbs switches go bad would it cause it not to start? Could the ECU or the fuel control module be bad? 



#2
240Z TwinTurbo

240Z TwinTurbo

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in addition to the relays are they fused?


2006 EVO IX (601hp/462tq @ wheels Shell 93 pump gas)
2009 GTR Premium (707hp/628tq @ wheels Shell 93 pump gas / 10.24@138)
Built RB26 with no home (everything is for sale...lots of stuff)

DIY700 - 700hp on a Budget

BW S362 SXE TwinScroll Project

Curt Brown 2.15L / S362 SX-E (68mm) / EVO IX / Pump Gas


#3
cpthurm09

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Yes, they are also fused. I just picked up a fuel pump controller. Hopefully that will fix the issue.



#4
240Z TwinTurbo

240Z TwinTurbo

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You just need to start tracing power from the source to the pump at all points in between.  Also, make sure you have a good ground.

  • Are you getting power from the battery to the fuse
  • Are you getting power on the backside of the fuse
  • Are you getting power to the relay
  • Are you getting power to the backside of the relay when activated

 

I chased a similar problem on my EVO a few years back and it ended up being a short in the damn fuse holder.  This should be a relatively easy process to diagnose if you have access.


Edited by 240Z TwinTurbo, 06 July 2018 - 07:47 AM.

  • 7racer likes this

2006 EVO IX (601hp/462tq @ wheels Shell 93 pump gas)
2009 GTR Premium (707hp/628tq @ wheels Shell 93 pump gas / 10.24@138)
Built RB26 with no home (everything is for sale...lots of stuff)

DIY700 - 700hp on a Budget

BW S362 SXE TwinScroll Project

Curt Brown 2.15L / S362 SX-E (68mm) / EVO IX / Pump Gas


#5
cpthurm09

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I'll retrace it out again. The car is down in Charleston and I will not be able to get to it until the next weekend. I'll let you know how it turns out. 






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