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Thread: Another fuel pump buzzing thread!

  1. #1
    Senior Member
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    Another fuel pump buzzing thread!

    It finally happened. After driving for 5 hours yesterday my fuel pump started buzzing. The car would buck if I pressed the accelerator pedal down quickly but did ok with a steady pressure. I limped home by filling up every 100 miles then letting the car sit for 20 minutes before continuing on my next 100 miles. Fun!

    I see lots and lots of threads about this problem with various ideas on what causes it and how to solve it. Iím mostly curious about the different fuel pumps that are available. Is one of them less susceptible to the hot fuel problem? One that sits lower in the tank maybe?

  2. #2
    Senior Member Parzival's Avatar
    Join Date:  Apr 2018

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    Iím going to upgrade to the one from DMC Huston. They are currently back ordered, but are expected to be back in stock very soon


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  3. #3
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    Quote Originally Posted by Parzival View Post
    Iím going to upgrade to the one from DMC Huston. They are currently back ordered, but are expected to be back in stock very soon


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    Seems like itís a good unit. Iím leaning that way as well. Iíd really like to be able to drive long distances without issue.

  4. #4
    Senior Member mr_maxime's Avatar
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    I have a lightly used one available for sale. My old fuel pump had a similar problem but it completely gve out on the highway. I changed it to the DMCH pump in Aug 2017.

    It also fixes the bad fuel sender if you have one.

  5. #5
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    Quote Originally Posted by mr_maxime View Post
    I have a lightly used one available for sale. My old fuel pump had a similar problem but it completely gve out on the highway. I changed it to the DMCH pump in Aug 2017.

    It also fixes the bad fuel sender if you have one.
    Pm on its way

  6. #6
    Senior Member DMC5180's Avatar
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    Quote Originally Posted by CFI View Post
    Pm on its way
    Sounds like you a broken pickup hose at the bottom of the pump. The pump sucks air, you lose fuel pressure, engine dies, fuel in tank sloshes forward, gets picked by the pump, engine fires up, sloshing fuel the other way. Rinse and repeat, aka stumble and bucking. Keep the fuel tank level above a 1/3 of a tank keeps the pump hose connection submerged in fuel.

    5 hrs of driving is pretty long trip, how low was fuel level when it started bucking? What was the OAT and were you using A/C?


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    DENNIS

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

  7. #7
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    Quote Originally Posted by DMC5180 View Post
    Sounds like you a broken pickup hose at the bottom of the pump. The pump sucks air, you lose fuel pressure, engine dies, fuel in tank sloshes forward, gets picked by the pump, engine fires up, sloshing fuel the other way. Rinse and repeat, aka stumble and bucking. Keep the fuel tank level above a 1/3 of a tank keeps the pump hose connection submerged in fuel.

    5 hrs of driving is pretty long trip, how low was fuel level when it started bucking? What was the OAT and were you using A/C?


    Sent from my iPhone using Tapatalk
    5 hours was just half the trip. After the first 5 hours the problem would occur about every 100 miles or so, even at 3/4 tank of gas. Temps in 80ís, AC on. Plenty of gas in the tank when bucking, it wasnít unporting.

  8. #8
    Senior Member DMC5180's Avatar
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    Quote Originally Posted by CFI View Post
    5 hours was just half the trip. After the first 5 hours the problem would occur about every 100 miles or so, even at 3/4 tank of gas. Temps in 80ís, AC on. Plenty of gas in the tank when bucking, it wasnít unporting.
    In that case probably hot fuel collapsing the soft pickup hose. I have a spring in mine to prevent that. But on rare occasion When driving in hot temps with low fuel in the tank, I would occasionally get the loud pump syndrome but never the bucking problem. I always knew it was just hot fuel.




    Sent from my iPhone using Tapatalk
    DENNIS

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

  9. #9
    Senior Member Bitsyncmaster's Avatar
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    Quote Originally Posted by DMC5180 View Post
    In that case probably hot fuel collapsing the soft pickup hose. I have a spring in mine to prevent that. But on rare occasion When driving in hot temps with low fuel in the tank, I would occasionally get the loud pump syndrome but never the bucking problem. I always knew it was just hot fuel.
    Sent from my iPhone using Tapatalk
    I had the same buzzing and I had the spring in the hose also. It wasn't until I added my fuel cooler that the buzzing stopped. But I've since upgraded to the new style GM pump.
    Dave M vin 03572
    http://dm-eng.weebly.com/

  10. #10
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    Trying to contact mr_maxime via pm but your box is full.

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