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    Results 1 to 5 of 5
    1. #1
      Join Date
      Dec 2006
      Location
      California
      Posts
      1,368
      Country Flag: United States

      Think my fuel pump is dying...

      Car's been sitting for a couple years at the body shop.

      It still starts and runs but doesn't run right. I don't think it's fuel related because there's a lot of valve chatter. I need to pull the valve cover to inspect but that's a different story.

      I've got a clear inline fuel filter between the carb and pump and I distinctly remember it being at least half full when I used to drive the car.

      Now there's barely anything in it while it's running.

      I was going to get a new pump because they're not that expensive, but a co-worker is making me have my doubts. I was going to get a $50 summit pump that puts out 110 gph but he's saying it will be too much and I should just go to AutoZone and get a $20 ac delco pump.

      The engine is supposed to have roughly 450 hp, but I haven't dyno'd it yet. I planned to get it running well enough and then get it Dyno tuned.

      Thoughts?

      Matt

      69 Nova - 357, TKO600, Tru Turn, some other stuff, awaiting LS1 swap
      71 Duster - all stock, slant 6, automatic. awaiting HEMI/T56 swap


    2. #2
      Join Date
      Dec 2010
      Location
      Fredericksburg, VA.
      Posts
      3,155
      Country Flag: United States
      I assume you are running a mechanical fuel pump judging from your post. I personally would not buy a cheap pump there are many mid-range pumps that are very nice for not that much money. Keep in mind that a high volume pump will simply bypass fuel that is not used.
      Steve Hayes
      "Dust Off"
      68 Camaro

      Given sufficient initial acceleration, even pigs can fly!

    3. #3
      Join Date
      Dec 2006
      Location
      California
      Posts
      1,368
      Country Flag: United States
      Yes, mechanical pump.

      All the info I can find online says that even a 500 hp engine needs less than 40 gph, and the AC delco one puts out 40 gph so it should be more than enough.

      That's my friend's argument anyway, lol.

      I don't think a $150 pump is necessary, but the $50 summit pump seems like a hard deal to pass up.

      So if I get a higher output pump, it won't cause problems? I vaguely remember reading that too much pressure/flow could overpower the carb and cause issues.
      Matt

      69 Nova - 357, TKO600, Tru Turn, some other stuff, awaiting LS1 swap
      71 Duster - all stock, slant 6, automatic. awaiting HEMI/T56 swap

    4. #4
      Join Date
      Aug 2007
      Location
      Jonesboro, Arkansas
      Posts
      2,506
      Country Flag: United States
      The problem with a high volume pump is that sometimes they have high pressure. A carb only needs between 7 and 14 psi. I would think anything above that and you'll need a regulator, possibly with a bypass. High pressure in a carb just causes float problems that lead to carb running rich.

      Carl Wilson
      1968 Camaro - T-56 6 speed - 383 Stroker, 2014 Mustang GT seats. FiTech EFI, Tanks Inc. Tank with Deutschwerks fuel pump.

    5. #5
      Join Date
      Dec 2006
      Location
      California
      Posts
      1,368
      Country Flag: United States
      Well I got the AC Delco pump from AutoZone. My filter is still basically empty when the engine is running. I could have sworn it used to be more full, but I guess not.

      Seems to be running better now anyway, so I guess I'll leave well enough alone.
      Matt

      69 Nova - 357, TKO600, Tru Turn, some other stuff, awaiting LS1 swap
      71 Duster - all stock, slant 6, automatic. awaiting HEMI/T56 swap





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