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Thread: Hot start problem resolved due to failed check valve in the DMCH fuel pump

  1. #1
    Senior Member
    Join Date:  Aug 2012

    Location:  St. Louis, MO

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    Hot start problem resolved due to failed check valve in the DMCH fuel pump

    I finally got rid of the hot start problem due to the failed check valve in the new DMCH fuel pump combo. I installed the S.U.R. and R. check valve.

    It took about thirty minutes and after 3 days of running it I've not had a single hot start issue. Hopefully this is now a non-issue; my thought is an external check-valve will be an included item in the revised DMCH fuel pump combo.

    A few shots of the installation...fairly straight forward.
    Michael Todd
    St. Louis

  2. #2
    aka RacerX Ryan S.'s Avatar
    Join Date:  Jun 2011

    Location:  Sacramento, CA

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    My VIN:    2567 (Sold)

    I installed mine over a month ago and still works. Mine is located much closer to the pump. The kit didn't come with hose clamps but fortunatly I had some left overs from accumulator job.
    i think amazon was a little cheaper.

  3. #3
    Senior Member
    Join Date:  May 2011

    Location:  Northern NJ

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    My VIN:    10757 1st place Concourse 1998

    Quote Originally Posted by cybercusp View Post
    I finally got rid of the hot start problem due to the failed check valve in the new DMCH fuel pump combo. I installed the S.U.R. and R. check valve.

    It took about thirty minutes and after 3 days of running it I've not had a single hot start issue. Hopefully this is now a non-issue; my thought is an external check-valve will be an included item in the revised DMCH fuel pump combo.

    A few shots of the installation...fairly straight forward.
    In fact, it is probably a good way to fix a problem with the check valve in the OEM pump setup too. The only question remaining is how it will hold up to E-10 fuel. Just be SURE to install it in the correct direction!!!!!!
    David Teitelbaum

  4. #4
    Senior Member - Owner since 2003 Patrick C's Avatar
    Join Date:  May 2011

    Location:  Northern Michigan

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    Club(s):   (DCO) (DCUK)

    I was unaware that the new DMCH unit was having such problems with check valves. Good fix you developed here!
    Patrick C.
    VIN 1880
    Modifications done to my car can be seen in this video: https://youtu.be/ncMjW2pI2e4

  5. #5
    Mostly Harmless... refugeefromcalif's Avatar
    Join Date:  Aug 2012

    Location:  Duncanville, Alabama USA

    Posts:    825

    My VIN:    6599

    I just ordered my check valve.

    George
    George.



    1974 BMW RS90 motorcycle
    1981 DeLorean. Cruise Control, Wings-A-Loft, Eibach springs, Spax shocks, Stage1 exhaust, Manual, Grey and Grooved, LED clock and fixed pulls.
    1993 del Sol S (With a Few, Upgrades)
    2017 Chrysler Pacifica Limited

  6. #6
    LS Swapper Josh's Avatar
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    Location:  Illinois

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    Club(s):   (DMWC) (TXDMC) (DCUK) (DOI)

    I am going to be ordering one of these pump/sender combos in the near future, I find it very dissapointing that this is the fix if it is a common problem. I will be spending 400+shipping+duties, and I do not want to be spending 40+shipping more.

    Supercharged 5.3L LS4 + Porsche 6spd
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    lsdelorean.com

  7. #7
    Banned
    Join Date:  Sep 2011

    Location:  Sunfield, Michigan, USA

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    Quote Originally Posted by Josh View Post
    I am going to be ordering one of these pump/sender combos in the near future, I find it very dissapointing that this is the fix if it is a common problem. I will be spending 400+shipping+duties, and I do not want to be spending 40+shipping more.
    Yep it is a very known problem - even on units that should be good according to DMCH's supplier (such as mine). But you don't need to buy such an expensive check valve. Unless you want to be adding an external in-line check valve later, then I suggest doing it when you install the pump/sender combo, if not for anything more than insurance.

    Here's the one that I just ordered - $14 including worldwide shipping, ships from Memphis, TN:



    http://www.ebay.com/itm/5-16-Check-V...df8304&vxp=mtr

    Or, you can get the $8 plastic unit, including worldwide shipping, ships from Miami, FL:



    http://www.ebay.com/itm/5-16-8mm-One...249e78&vxp=mtr

  8. #8
    Senior Member Bitsyncmaster's Avatar
    Join Date:  May 2011

    Location:  Leonardtown, MD

    Posts:    8,679

    My VIN:    03572

    I don't see a pressure rating on that plastic valve. Looks like a vacuum type check valve. I would never trust it for 75 PSI fuel.
    Dave M vin 03572
    http://dm-eng.weebly.com/

  9. #9
    Senior Member DMC5180's Avatar
    Join Date:  May 2011

    Location:  Reedsburg, WI

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    My VIN:    5180

    Club(s):   (DMWC) (DCUK)

    Quote Originally Posted by Josh View Post
    I am going to be ordering one of these pump/sender combos in the near future, I find it very dissapointing that this is the fix if it is a common problem. I will be spending 400+shipping+duties, and I do not want to be spending 40+shipping more.
    You may Not have any issue with your combo/sender unit. But nothing is 100% failure proof. I don't see a need for you to get the Extra Check valve (insurance) unless you choose too. Even then you should be able to find a suitable check valve in CANADA.
    DENNIS

    VIN 5180, Frame 3652, STAGE II​, DM-eng Solid State Solutions (RPM Rly, Dm.Lt.Mod., Fan Fail Mod. , FAN Rly, HS.Rly) , HID headlights, SPAX user since 2009, Eibach springs, M Adj. Rear LCA's, DPNW poly-sway bar kit, DMCEU LCA Stabilizer link kit, DMCMW Illuminated door sills, Aussie Illuminated SS Shifter plate, REAL MOMO EVO Steering wheel, DELOREANA Extended View Side Mirrors w/ Heaters, DELOREANA LED Door Lights.

  10. #10
    LS Swapper Josh's Avatar
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    Location:  Illinois

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    Quote Originally Posted by DMC5180 View Post
    You may Not have any issue with your combo/sender unit. But nothing is 100% failure proof. I don't see a need for you to get the Extra Check valve (insurance) unless you choose too. Even then you should be able to find a suitable check valve in CANADA.
    Yeah I know I can find the CV. However what I was getting at is buying a drop in solution for the pump/sender and having to upgrade parts right off the hop.

    Supercharged 5.3L LS4 + Porsche 6spd
    [email protected]
    deloreanmidwest.com
    lsdelorean.com

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