95 Cobra Won't Start - Bad Fuel Pump?

Discussion in '94-95 5.0 - Specific' started by WHTEVNM, Jul 20, 2014.

  1. WHTEVNM

    WHTEVNM New Member

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    Last week I was pulling into my garage from work and my Cobra just died and hasn’t started since. It will crank and when I sprayed starter fluid in the throttle body and cranked it, it started up. This leads me to believe that I have spark and the ignition system is good. When I turn the key I can hear a buzzing noise from the CCRM in the front of the car so that leads me to believe that the CCRM is good. As far as I can tell, I cannot hear the fuel pump prime the system when I turn the key. I have checked all fuses and they are good, replaced the fuel filter, checked the inertia switch, and checked the schrader valve. When I crank the key and compress the core of the schrader valve, a little bit of fuel trickles out. If the fuel pump was good, I would imagine that a spray of fuel would come out of the valve. I believe that the fuel pump is bad but before I take on the large task of replacing it, I wanted to see what other opinions are out there. Thanks for reading!
     
  2. 94IVGT

    94IVGT Active Member

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    It does sound like a bad fuel pump. But you could also take your meter to the pump harness and check for power at pmp and check the ground as well just ti make sure.
     
  3. ttocs

    ttocs Legend

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    check the inertia switch if you suspect fuel. After that check all your fuses. yes I said all don't forget the ones under the hood.
     
  4. WHTEVNM

    WHTEVNM New Member

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    Thanks for the response. I have heard of the PIP sensor in the dizzy going bad in these cars but, like I said, when we spray starter fluid in the throttle body the car will start so I do have spark. Now I’m starting to think that the issue is the CCRM. I put my ear up to the fuel tank and had someone turn the key and can definitely say that the fuel pump makes a buzzing noise to prime the system. I also put a voltmeter on the wire harness plug to the fuel tank and it was getting voltage. Maybe not enough from the CCRM to prime the system? I got about 9.8 volts. How much does the fuel pump require? Also, when the key is turned, the CCRM makes about 3 or 4 clicking noises. Is that normal? If I do get a new CCRM how do I know I get the correct one? Sorry for all of the questions. I really want to get this car up and running. I just bought it a month ago.
     
  5. CC'S95GT

    CC'S95GT Legend

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    The PIP also restarts the FP after the initial 5 second prime.
    Meaning you might hear the FP when you first hit the key but the PIP isn't sending the signal to turn the FP back on when the engine is running.
    Also when my PIP went out I was getting a weak spark but it wasn't enough to light the fuel.
     
  6. WHTEVNM

    WHTEVNM New Member

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    Any other advice? I have some people tell me it sounds like the fuel pump and others tell me it could be the CCRM or the PIP sensor in the dizzy. I don't think it is the ignition system because the car will start with starter fluid. I can hear the fuel pump kick on when I turn the key on. The CCRM is making a weird clicking noise when I turn the key on. Is that normal? I don't know what else to do other than buy a new CCRM and hope that that is the problem.
     
  7. spank 141

    spank 141 New Member

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    Fuel should squirt out of fuel rail not just trickle. Put a 12v source on the pump directly and see if it comes on. Battery chargers work good for this. Not sure if 9.8v is good enough. Check fuel rail again to see if fuel squirts out if you hear it come on. Ive had fuel pumps get stuck you here the buzz motor trying to turn but nothing coming out. I just soaked the pump in electric motor cleaner and tapped it with a hammer and freed it up.
     
  8. WHTEVNM

    WHTEVNM New Member

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    I hooked up a fuel pressure gauge to the schrader valve and the system isn’t being pressurized. No reading on the gauge with the key on or when I crank the motor. The fuel pump is getting power and I had someone crank the motor while I hit the fuel tank to try and get the pump going but nothing happened. Even though I can hear the pump buzzing when the key is on and a little fuel jumps out of the schrader valve when the core is compressed and the motor is cranked, it doesn’t seem to be priming the system. At this point I think I will order a fuel pump. Any issues with this pump?
    http://www.latemodelrestoration.com...ng-Walbro-255-Lhp-High-Pressure-Fuel-Pump-Kit
     
  9. CC'S95GT

    CC'S95GT Legend

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    looks like it'll do the job. Don't forget to get a "filler neck grommet" or the tank will leak when you fill it up.
     
  10. WHTEVNM

    WHTEVNM New Member

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    It turns out that it was the fuel pump. I got the assembly out of the tank and the hose that connects the pump to the fuel lines was completely shredded and falling apart! It was a crazy sight. Anyway, I threw in the Walbro GSS340 and she started right up. Thanks for the help everyone!
     
  11. BLWNBYU

    BLWNBYU Active Member

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