Cobra fuel pumps won't stop priming - Forums at Modded Mustangs
 
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post #1 of 4 Old January 8th, 2017, 09:02 PM Thread Starter
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Cobra fuel pumps won't stop priming

As the title says, my fuel pumps won't stop priming. So bad that the fuel line blew off at the rails twice from just having the key rolled forward.

I ended up having the same problem while installing my BAP and dual FPDM so I brought everything back to stock and I'm still having the same issue. Any suggestions?

A little more info; an fpdm went bad as well but it has been replaced.

Some more info, the previous owner had a return fuel system he had taken off prior to selling. So there are some spliced wires. Not sure if that makes any difference
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post #2 of 4 Old January 8th, 2017, 09:35 PM
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Quote:
Originally Posted by 04MCcobra View Post
Some more info, the previous owner had a return fuel system he had taken off prior to selling. So there are some spliced wires. Not sure if that makes any difference
That sounds like your culprit. It's probably still setup for the return system that would run the pumps all the time. Can you trace the wiring?
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post #3 of 4 Old January 8th, 2017, 09:53 PM
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Your going to need to get out the Schematics there are a few wires hooked up to constant 12V and nothing to regulator pump pressure.. Do you still have the fuel rail pressure regulator installed?


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post #4 of 4 Old January 15th, 2017, 12:32 PM Thread Starter
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Originally Posted by SSG Pate View Post
Your going to need to get out the Schematics there are a few wires hooked up to constant 12V and nothing to regulator pump pressure.. Do you still have the fuel rail pressure regulator installed?
I still have the regulator installed. I bout a new ccrm for $50 as well as a fuel pressure gauge so I can see keep an eye on the pressure while troubleshooting. I'm out of town at the moment but hope maybe the ccrm fixes it. Some relays on the ccrm That's on it now has some soft bubble like spots on them. Almost as if they got too hot and started melting. We'll see what happens with the new ccrm when I get back home.

---------- Post added at 12:32 PM ---------- Previous post was at 11:18 AM ----------

Quote:
Originally Posted by WickedSnake00 View Post
That sounds like your culprit. It's probably still setup for the return system that would run the pumps all the time. Can you trace the wiring?
I can for the most part. The shielded bare wire that runs the length of the harness after that FPDM was frayed so I repaired that as well as the shielding, hoping that was the problem but it didn't change anything. When I get back in town I'm going to do another nice and thorough inspection.
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