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Thread: Fuel pump going out?

  1. #16
    dangrus is offline Cadillac Owners Member
    Automobile(s): 06 CTS-V
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    Re: Fuel pump going out?

    Having your car start after being towed home is a good sign that it is the fuel pump. I replaced mine in Sept with one from Oreillys because it was the only one in town. It then went out a couple weeks ago. It lost power on the highway for a few seconds, kind of seemed like I left off the gas pedal, then it resumed. About 10 minutes later it died when I stopped at an intersection and never started again. I looked through the different fuel pump threads and decided that the stock one was good enough for my limited mod plans so I bought an AC Delco off of Rock Auto and had it shipped to me. I had a full tank of fuel and it was 0 degrees out so I paid the dealership to replace it with my new pump because I needed it back ASAP.

    I never got any codes, and I also checked the fuel pressure OBD PID but I could never get a reading. I have replaced a lot of fuel filters, never seen any positive results, but it is a cheap check prior to ripping into this project. You can hear the pump pretty well when you have your back seat out of the car. There is a harness above the rear axle that I toned out to see which wires power the pump, that way I could power it straight from the battery to verify wiring/relays. Here is a picture of it. I can't remember right off hand if this was where I was measuring the voltage coming from the relay or power the pump.

    fuel pump wiring.jpg

  2. #17
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    Re: Fuel pump going out?

    Went ahead and ordered the DW200 pump and racetronix harness. Hopefully, it'll be a solid combo for years to come. Don't plan on exceeding 500rwhp any time soon.

  3. #18
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    Re: Fuel pump going out?

    So I have this pump set up now:


    Still waiting on the Racetronix harness.

    I went ahead and cut the access panel tonight.



    Got a little closer... Take a look here:



    Yeah, melted through at the electrical connection. What are my options guys? Am I going to have to buy a whole new pump assembly? Is there anything I can use to patch it? I'd rather not have to spend $250+ on a new assembly just to have to rip it apart and swap in my DW pump.

    On a side note, I realize this is exactly what happened to the guy in the other thread (albeit to a lesser extent), but he was running a BAP increasing the voltage for over 10k miles. This is a 100% stock fuel system on this car with only 88k miles. Does anyone else think it's a little scary that this could happen to you?

    ----------

    Anyone know where I can source the connector with pigtails? All I've been able to find is the connector itself from Racetronix and I don't want to spend $16 on shipping for an $8 part.

    Thanks.

  4. #19
    JD03Cobra's Avatar
    JD03Cobra is offline Cadillac Owners Connoisseur
    Automobile(s): 2010 Thunder Gray 6MT
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    Re: Fuel pump going out?

    Mine just died on my the other day. Stopped at a gas station, filled up, jumped in and she wouldn't start. That sucked.

  5. #20
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    Re: Fuel pump going out?

    Went ahead and found a used pump assembly on eBay for cheap that I bought. Since I'm replacing the pump anyway, it's not a big deal to me how many miles it has on it. Also sourced the connector, so I should be set on the repair.

  6. #21
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    Re: Fuel pump going out?

    So I finished up the install yesterday.

    Simple as can be. Pulled out the bucket and swapped in the DW200. DW said they thought I might need to modify the mounts, but it was literally a drop in. The only modification I had to do was to dremel out the front of the bucket slightly to clearance the rubber hose off the output of the pump. I only snapped a couple pictures as I was in a time crunch to get it done.



    You can see the mounting brackets worked perfectly.



    I couldn't get a hose clamp on the opposite side of the hose as there was no room where it went, but it was a SNUG fit, so I'm not worried about it.

    The harness was a major PITA to install without dropping the tank or removing the alternator. But I got it done. No pictures of that. I was too dirty and angry getting that sucker installed.

    Overall, I'm pleased with it thus far. A couple key cycles to get it primed and it fired right up. No noticeable noise while driving, but the priming is loud enough to hear, unlike my factory pump. I like that.

  7. #22
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    Re: Fuel pump going out?

    So I tested my fuel pressure today. 40psi after primed and while idling. Any idea why it would be low? It holds at that pressure. What should I check first? Would it be due to the wiring harness, or the pump, or regulator, or what?

  8. #23
    darkman's Avatar
    darkman is offline Cadillac Owners Master
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    Re: Fuel pump going out?

    The specification (55-62 psi) is with the engine off. See attached.

  9. #24
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    Re: Fuel pump going out?

    I checked it without the harness to rule that out, no such luck. With harness, 40psi, without 35psi. Double checked my gauge on my jeep, reading 47psi which is normal on it...

  10. #25
    darkman's Avatar
    darkman is offline Cadillac Owners Master
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    Re: Fuel pump going out?

    Quote Originally Posted by ForcFed93 View Post
    I checked it without the harness to rule that out, no such luck. With harness, 40psi, without 35psi. Double checked my gauge on my jeep, reading 47psi which is normal on it...
    I hate to be dense, but I do not understand the significance of with or without the harness in the context of whether the engine is running or not running. As I read the literature the pump (the oem pump actually) was supposed to deliver 55-62psi at the fuel rail with the ignition on, and the engine OFF, which means with the engine idling (as in your post #22) it would presumably deliver lower pressure.

  11. #26
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    Re: Fuel pump going out?

    The racetronix hotwire kit. It's a full harness that pulls power directly from the alternator.

    Key on engine off it runs 38-39. Running it's a tad higher at 40. Using the factory harness, presumably running lower voltage, it is 35 key on engine off.

    I'm guessing it's either the regulator, or DMM mentioned on tech possible a leaking jet pump. Thoughts on either of those?

  12. #27
    darkman's Avatar
    darkman is offline Cadillac Owners Master
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    Re: Fuel pump going out?

    Quote Originally Posted by ForcFed93 View Post
    I'm guessing it's either the regulator, or DMM mentioned on tech possible a leaking jet pump. Thoughts on either of those?
    No, I would just have to run the troubleshooting chart.

  13. #28
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    Re: Fuel pump going out?

    Gotcha. I'm going to try to change the fuel filter. Possibly got some junk into it with the swap. Cheap/easy option to start with. I don't think it's the regulator since it holds pressure well.

  14. #29
    heavymetals's Avatar
    heavymetals is offline Cadillac Owners Master
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    Re: Fuel pump going out?

    I would hook a voltmeter and an ammeter up to the pump input and now that you have an access door, even easier.

    You would be surprised how just a minor voltage drop affects pressure.

    Deatschwerks has charts for their pumps:

    http://www.deatschwerks.com/resource...fuel-pump-tech

  15. #30
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    Re: Fuel pump going out?

    Problem solved. The line where the pump feeds was too loose. Snugged it up and clamped it and now I have solid pressure.

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