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  • 2005 - 2014 S-197 Mustang -General/Talk-
  • 2005 - 2009 Specific Tech

test gt500 pumps to see if both are running

  • Thread starter Thread starter gpp
  • Start date Start date Aug 24, 2008
G

gpp

Member
Jul 3, 2005
137
0
16
Aug 24, 2008
#1
  • Aug 24, 2008
  • #1
how can i test a gt500 fuel pump to see if both pumps are running.ive checked the wiring harness and i think its right but im having a idle problem and low end drivabilty problem with my saleen sc so i want to make sure they both are running.im driveing the crew at jdm crazy over this so before i take it out and put the stock one in i thought i would check the pumps.chris and jim have been great help and i want to make sure the problem isnt my fault.
 

klaw

Member
Oct 11, 2007
343
0
16
Calgary, Alberta, Canada
Aug 24, 2008
#2
  • Aug 24, 2008
  • #2
gpp said:
how can i test a gt500 fuel pump to see if both pumps are running.ive checked the wiring harness and i think its right but im having a idle problem and low end drivabilty problem with my saleen sc so i want to make sure they both are running.im driveing the crew at jdm crazy over this so before i take it out and put the stock one in i thought i would check the pumps.chris and jim have been great help and i want to make sure the problem isnt my fault.
Click to expand...

What makes you think it's a fuel pump problem? - I would think that that would cause problems (starvation) at high RPM/boost rather than idle/low. I've heard of idle problems with a malfunctioning bypass actuator. My Whipple included a procedure for checking actuator function prior to driving. I'm thinking that the actuator might be stuck and not bypassing at low RPM/closed throttle. Would be worth checking?

Do you have boost, wideband AFR, and fuel pressure gauges? I'd recommend them for F/I applications.
 
D

darrik

New Member
Aug 17, 2008
4
0
0
vernon bc canada
Aug 25, 2008
#3
  • Aug 25, 2008
  • #3
fuel pump check

You can check the fuel pumps when the car is idling, you just have to get to the top of your fuel pumps and unhook one at a time, if the car stalls when you unhook one, then that one is not working. I have a whipple setup and thats how I checked them.
 
G

gpp

Member
Jul 3, 2005
137
0
16
Aug 26, 2008
#4
  • Aug 26, 2008
  • #4
klaw,what is the procedure to check the vacumn actuator?
 

klaw

Member
Oct 11, 2007
343
0
16
Calgary, Alberta, Canada
Aug 26, 2008
#5
  • Aug 26, 2008
  • #5
gpp said:
klaw,what is the procedure to check the vacumn actuator?
Click to expand...

The Whipple instruction manual can be found at the link below. The actuator tests are on pages 70 and 73. I would expect that your Saleen actuator would be similar (vacuum operated).

Whipple Supercharger Installation Manual.pdf
 
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