FRAMING JOHN DELOREAN - ON VOD www.framingjohndeloreanfilm.com
Results 1 to 5 of 5

Thread: Fuel pump rattle

  1. #1
    Junior Member
    Join Date:  Apr 2023

    Location:  Elkhart, Indiana

    Posts:    25

    My VIN:    10620

    Fuel pump rattle

    Hi, folks. Just removed and reinstalled baffle and pump. The top parts of the pump weren't assembled very well, the main large boot was not installed well, and there was no hose from the hard return line feeding back into the center of the baffle. Fuel was just getting everywhere, and I was getting a howling pump after a long drive on a hot day. So I ordered several new parts from DGo and everything looks great, no leaks. Part of the order was the reinforcing spring to push into the pickup hose, and part of the order was a replacement check valve because the PO had gouged one of the hex faces during installation. Spring went in generally problem-free, but there was about 2 inches of leftover spring that did not compress easily into the hose, so I just cut it off. Check valve went on fine. Bench tested the pump. Did not hear anything unusual, but was only able to test in short runs of no more than 10 seconds because I didn't have a very large container for fuel available.

    Please check out the vid. This rattle is only thing that concerns me. The only thing that makes sense is for it to be the ball in the check valve. Is it moving around more than it should? Is this perfectly normal? Is it the check valve at all? Is it the spring somehow moving around in the pickup hose? But it really seems to be coming from the top of the pump. It's like a can of spray paint that you're shaking really slowly, one ball movement at a time. Each ping or rattle is accompanied by a slight surge in the feed hose that you can feel when lightly gripping the hose. It's definitely not the accumulator "thump" that I've read about on here. And I don't have any hot start issues. Also engine idle, sound, and performance don't seem to be affected. If you're standing back there watching the engine idle, you'd never know there was this rattle and surge. It's just an even, normal sounding idle. No hesitation when accelerating.

    I would appreciate input. Thanks, everyone. --Danny

    Last edited by dmcindiana; 06-07-2024 at 09:57 PM.

  2. #2
    Senior Member
    Join Date:  May 2011

    Location:  Northern NJ

    Posts:    8,606

    My VIN:    10757 1st place Concourse 1998

    Quote Originally Posted by dmcindiana View Post
    Hi, folks. Just removed and reinstalled baffle and pump. The top parts of the pump weren't assembled very well, the main large boot was not installed well, and there was no hose from the hard return line feeding back into the center of the baffle. Fuel was just getting everywhere, and I was getting a howling pump after a long drive on a hot day. So I ordered several new parts from DGo and everything looks great, no leaks. Part of the order was the reinforcing spring to push into the pickup hose, and part of the order was a replacement check valve because the PO had gouged one of the hex faces during installation. Spring went in generally problem-free, but there was about 2 inches of leftover spring that did not compress easily into the hose, so I just cut it off. Check valve went on fine. Bench tested the pump. Did not hear anything unusual, but was only able to test in short runs of no more than 10 seconds because I didn't have a very large container for fuel available.

    Please check out the vid. This rattle is only thing that concerns me. The only thing that makes sense is for it to be the ball in the check valve. Is it moving around more than it should? Is this perfectly normal? Is it the check valve at all? Is it the spring somehow moving around in the pickup hose? But it really seems to be coming from the top of the pump. It's like a can of spray paint that you're shaking really slowly, one ball movement at a time. Each ping or rattle is accompanied by a slight surge in the feed hose that you can feel when lightly gripping the hose. It's definitely not the accumulator "thump" that I've read about on here. And I don't have any hot start issues. Also engine idle, sound, and performance don't seem to be affected. If you're standing back there watching the engine idle, you'd never know there was this rattle and surge. It's just an even, normal sounding idle. No hesitation when accelerating.

    I would appreciate input. Thanks, everyone. --Danny

    It will not be as noisy when you put the top cover boot on and get some more fuel in tank and the cover in the wheel well. Make doubly sure the pick-up hose is not twisted or kinked even though you have the spring in it.
    David Teitelbaum

  3. #3
    Junior Member
    Join Date:  Apr 2023

    Location:  Elkhart, Indiana

    Posts:    25

    My VIN:    10620

    Quote Originally Posted by David T View Post
    It will not be as noisy when you put the top cover boot on and get some more fuel in tank and the cover in the wheel well. Make doubly sure the pick-up hose is not twisted or kinked even though you have the spring in it.
    Hey, David. I appreciate it. Just to be clear, it?s not the general hum of the pump. It?s those isolated rattles/pings/clicks. Check out 0:10 for one and 0:18 for a little cluster of them. It?s those clicks that I?m worried about.

  4. #4
    Motors about after dark Michael's Avatar
    Join Date:  May 2011

    Posts:    4,793

    My VIN:    Banged your VIN'S mom

    I had a brand new Dgo pump go bad within 50 miles on a cool day...started the humming that is consistent with a hot pump even though it was only 70 degrees out. Their oe pumps are JUNK!

    Then again, all OE style pumps are garbage these days. Once upon a time, back before Bosch moved their operations to Mexico, you could still get good OE style pumps but even with a good pump, the original design of the fuel system was weak especially in hot climates. Yours may sound good for now but I don't trust any of the oe style offerings today. It will puke out sooner rather than later.

    Dump all that garbage and get a pump from DeLorean Industries. I've had mine for like 3 years now and we have some hot summers here. It's never missed a beat and I have never worried about it since.

    https://deloreanindustries.com/the-e...-sender-gen-3/

    PS: I got the cheaper one with the divorced sensor and kept my original level sensor in use.
    Last edited by Michael; 06-09-2024 at 10:17 AM.
    http://dmctalk.org/image.php?type=sigpic&userid=90&dateline=161808992  9

  5. #5
    Junior Member
    Join Date:  Apr 2023

    Location:  Elkhart, Indiana

    Posts:    25

    My VIN:    10620

    Quote Originally Posted by Michael View Post
    I had a brand new Dgo pump go bad within 50 miles on a cool day...started the humming that is consistent with a hot pump even though it was only 70 degrees out. Their oe pumps are JUNK!

    Then again, all OE style pumps are garbage these days. Once upon a time, back before Bosch moved their operations to Mexico, you could still get good OE style pumps but even with a good pump, the original design of the fuel system was weak especially in hot climates. Yours may sound good for now but I don't trust any of the oe style offerings today. It will puke out sooner rather than later.

    Dump all that garbage and get a pump from DeLorean Industries. I've had mine for like 3 years now and we have some hot summers here. It's never missed a beat and I have never worried about it since.

    https://deloreanindustries.com/the-e...-sender-gen-3/

    PS: I got the cheaper one with the divorced sensor and kept my original level sensor in use.
    Michael, appreciate it. But my question is specifically about those little pings/clicks. In the video you can hear several individual clicks and there?s a little cluster of them at 0:18. Are you familiar with these little rattles?

    I must agree with you, though. The next time even the slightest thing goes south with this setup, I?m going modern.

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •