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Thread: Fuel pump question

  1. #1
    Not really banned Michael's Avatar
    Join Date:  May 2011

    Posts:    3,247

    Fuel pump question

    So I took my car out for a spring shakedown cruise last week. I ran it for a few hours with ac on which of course blows hot air on the fuel pump area. After getting home the pump was singing a song of woe. The engine ran fine. So, is the pump on it's way out when it makes noise or is this a normal symptom of a pump that just got too hot? Keep in mind it was very hot that day and the engine still ran fine. I have a spare pump I can replace with or shall I get a hot air dam? Or both?
    OE pump btw, not the new ones. Not sold on those quite yet.

  2. #2
    Senior Member Christian Dietrich's Avatar
    Join Date:  May 2011

    Location:  Bunker Hill, West Virginia

    Posts:    630

    My VIN:    11035

    Did it sound like the bearings in the motor for the pump for the impeller? Its possible that the fuel pump can be going out if it's starting to sound like that when it's really hot outside. I have a piece of heavy-duty rubber I got some work that I want to install directly behind the fans so it blocks the air going across the gas tank. I seen Hervey has something like that also. The new fuel pumps that you can get from DMC good and mine is been in my car now for 2 years without any issues at all and it's a really simple install. I know they had issues with them before but even on days when it's been crazy hot outside and everything I've never had an issue once. Was it like a whining sound that you were hearing?

    Sent from my SM-N920P using Tapatalk
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  3. #3
    Not really banned Michael's Avatar
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    Quote Originally Posted by Christian Dietrich View Post
    Did it sound like the bearings in the motor for the pump for the impeller? Its possible that the fuel pump can be going out if it's starting to sound like that when it's really hot outside. I have a piece of heavy-duty rubber I got some work that I want to install directly behind the fans so it blocks the air going across the gas tank. I seen Hervey has something like that also. The new fuel pumps that you can get from DMC good and mine is been in my car now for 2 years without any issues at all and it's a really simple install. I know they had issues with them before but even on days when it's been crazy hot outside and everything I've never had an issue once. Was it like a whining sound that you were hearing?

    Sent from my SM-N920P using Tapatalk
    It was more of a loud groan, changing pitch at times. I started it up again after it cooled and it's fine. Like I said I have a brand new pump I can install but if this is just a normal reaction of one that's got too hot then there is no point in changing it and I will just get a deflector(and if Hervey is the only vendor that offers them, I will make my own).

  4. #4
    Senior Member Christian Dietrich's Avatar
    Join Date:  May 2011

    Location:  Bunker Hill, West Virginia

    Posts:    630

    My VIN:    11035

    My best friend has a stock fuel pump in his DeLorean and I've never heard any noises with his but I wonder with the change of the temperature of the fuel if the pickup hose from the screen to the pump started to collapse causing the fuel pump too groan and work harder? If you do go in there and investigate you probably should also check that pick up hose or replace it! That's one thing I do not like about the original stock fuel pump is a way that hose sits in there all angled and twisted and I always thought that was an Achilles heel to the fuel system
    Quote Originally Posted by Michael View Post
    It was more of a loud groan, changing pitch at times. I started it up again after it cooled and it's fine. Like I said I have a brand new pump I can install but if this is just a normal reaction of one that's got too hot then there is no point in changing it and I will just get a deflector(and if Hervey is the only vendor that offers them, I will make my own).
    Sent from my SM-N920P using Tapatalk
    Vin 11035 wide stripe, flat hood, 5 speed, Spec 1 exhaust, custom grey/black interior, custom lighting, custom stereo and custom alot of stuff!

  5. #5
    EFI'd dn010's Avatar
    Join Date:  Jul 2011

    Location:  Florida: Pinellas County

    Posts:    1,462

    My VIN:    5003

    Club(s):   (DCF)

    I've been running OE style "Hayg orig" 909 fuel pumps in my D ($50 on eBay). I replaced the first operational one with a new one because I used the first to get a Volvo running and was afraid I had damaged it - it still works and now rests as a spare in my trunk. Anyway, this pump seems to make a random groan while cold, hot etc. and it has for years now but its never let me down with the Florida heat. I can try taking a video of the noise if you want to compare.

    Every OE style pump I've run has made noise ever since I've owned the car 16 years ago, it has just come to be something I've accepted as normal.
    -----Dan B.

  6. #6
    Not really banned Michael's Avatar
    Join Date:  May 2011

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    Quote Originally Posted by Christian Dietrich View Post
    My best friend has a stock fuel pump in his DeLorean and I've never heard any noises with his but I wonder with the change of the temperature of the fuel if the pickup hose from the screen to the pump started to collapse causing the fuel pump too groan and work harder? If you do go in there and investigate you probably should also check that pick up hose or replace it! That's one thing I do not like about the original stock fuel pump is a way that hose sits in there all angled and twisted and I always thought that was an Achilles heel to the fuel system

    Sent from my SM-N920P using Tapatalk
    I forgot about the possibility of the pickup hose collapsing. I never did the spring mod. Maybe next tine I have it out I will pit in a piece of fuel hose not made of paper thin latex rubber.

  7. #7
    '82 T3 Turbo FABombjoy's Avatar
    Join Date:  May 2011

    Location:  Lansing, MI

    Posts:    593

    My VIN:    10270

    I had the air dam, Grady's improved pickup hose, and a pump with only 15k miles. Any time the heat index went above 90 that thing would howl. I pulled the original assembly out and the tank & pickup screen was spotless and pickup. No signs of collapse or kinked pickup hose. Ads for air dams/heat shields go back to 1986 in DeLorean World so it just seems that the OEM pump is crappy and cannot handle heat.

    heatshield.jpg

    The all-in-one module is dead silent. Other than the lack of key-on fuel level, I have no complaints. Eventually I'll fix that, too.
    Luke S :: 10270 :: 82 Grey 5-Speed :: Single Watercooled T3 .60/.48 :: Borla Exhaust :: MSD Ignition :: MS3X Fully SFI Odd-fire EFI :: DevilsOwn Methanol Injection

    Console5.com - Game console parts, kits, games and more. [shop] [wiki] [RSS] [f] [t]

  8. #8
    Member hippieman9's Avatar
    Join Date:  Jan 2018

    Location:  Haw River, NC

    Posts:    82

    My VIN:    06668 81' Grey interior, 5 speed, Grooved hood. Previous owner of 16301, in 2001.

    I have noticed that after a good day of driving my fuel pump whines too. Its a high pitched whine. If I stop and fill up with fuel the while goes away. I assume due to cool fuel in the tank cooling down the components. I like the idea of switching to the new style integrated fuel pump. I know I'd rather replace it once then have to worry about it when on a trip or something.

  9. #9
    EFI Squirted DARCOM's Avatar
    Join Date:  May 2011

    Location:  San Antonio TX

    Posts:    64

    My VIN:    2942

    My pump did this and what helped a bit was to make sure the return fuel line inside the tank sprays on to the fuel pump.

  10. #10
    Senior Member Christian Dietrich's Avatar
    Join Date:  May 2011

    Location:  Bunker Hill, West Virginia

    Posts:    630

    My VIN:    11035

    Yeah its really not the best design.
    Quote Originally Posted by Michael View Post
    I forgot about the possibility of the pickup hose collapsing. I never did the spring mod. Maybe next tine I have it out I will pit in a piece of fuel hose not made of paper thin latex rubber.
    Sent from my SM-N920P using Tapatalk
    Vin 11035 wide stripe, flat hood, 5 speed, Spec 1 exhaust, custom grey/black interior, custom lighting, custom stereo and custom alot of stuff!

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