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Electric Vs Mechanical Fuel Pump?

Discussion in 'Early CJ5 and CJ6 Tech' started by Jonbbrew, Feb 28, 2020.

  1. Mar 1, 2020
    47v6

    47v6 junk wrecker! 2020 Sponsor

    Washington DC.
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    I did keep the Astro/safari in tank fuel pump. The tank itself was huge and plastic and not much use otherwise. I didn't want to do the in tank option, but how much more work is it going to be overall in the whole project? Probably not a lot.. I may just weld up a new tank.
     
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  2. Mar 1, 2020
    timgr

    timgr Jeepin' Nerd 2020 Sponsor 2019 Sponsor

    Medford Mass USA
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    There are kits that allow conversion of existing tanks to in-tank fuel pumps. Check Summit. Likely not cheap.

    Lots on the net about this:
    in-tank fuel pump conversion - Bing
    CPP Universal EFI In-Tank Electric Fuel Pump Conversion Adapter Kit | eBay

    You can run a low-pressure pump (mechanical or electric) into an accumulator and put the high pressure pump somewhere below that. More complicated, but an option if you fear the single high-pressure pump outside the tank won't be ok. The GM in-tank pump runs at a fairly low pressure I recall, something like 20 psi? If you want higher pressure, you'll need to use something else.

    [​IMG]
     
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  3. Mar 1, 2020
    47v6

    47v6 junk wrecker! 2020 Sponsor

    Washington DC.
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    I was thinking about this very concept, but it may be as time consuming and expensive as just making my own tank to work with the correct OEM Astro/Safari in tank pump. The stock 76, or so, tank I am using is not ideal.
     
  4. Mar 1, 2020
    Dphillip

    Dphillip Sponsor

    Omaha NE
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    This is how I built mine.
    Pump is simply attached to the pick up tube by a length of submersible hose and clamps. I also ran a piece of safety wire from the pump to the sending unit in the unlikely event the hose clamps would fail and the pump would detach from the tube.

    EE942299-B4FA-4954-9135-67A2ABD4D903.jpeg
     
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  5. Mar 1, 2020
    Howard Eisenhauer

    Howard Eisenhauer Super Moderator Staff Member

    Tantallon, Nova...
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    To the OP- if you're already plumbed for the electric just put in a repalcement, wire the ground lead to the low oil pressure sensor. Carry a spare. Enjoy.
     
  6. Mar 1, 2020
    65CJ5 SRD

    65CJ5 SRD Member

    NM
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    Electric mounted to the frame. I prefer the old mechanical from an originality standpoint but was tired of the hassle. So far the electric has been fine.
     
  7. Mar 1, 2020
    47v6

    47v6 junk wrecker! 2020 Sponsor

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    Its that easy?!?!?!?!!?!?!?!?!?!?!
     
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  8. Mar 1, 2020
    PeteL

    PeteL Member 2020 Sponsor 2019 Sponsor

    Hills of NH
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    No hassle to me. Mine just work and work. I rebuilt maybe two in 40 years.
     
  9. Mar 1, 2020
    Dphillip

    Dphillip Sponsor

    Omaha NE
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    Yes, it really is!
    I put that contraption in my tank about 20 years and 60 thousand miles ago with zero problems.

    Last year my poly tank developed a leak so I swapped it for a new metal tank. While I had things apart I decided to put in a new fuel pump just for peace of mind. Rock Auto had a Bosch replacement pump with a lifetime guarantee for about fifty bucks. I also noticed the small length of submersible fuel hose had become somewhat soft so that was replaced as well. Not surprising for being submerged in gas for 20 years.
     
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  10. Mar 1, 2020
    45es

    45es Member 2019 Sponsor

    Naches, WA
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    It may not be quite that simple. If I'm not mistaken, Dphillip is using a 1993 Chevy 4.3L engine which uses throttle body EFI. That system operates at 12psi. 47c6 is planning to use a 2000 Chevy 4.3L engine which uses central port EFI (spider injection) which operates at approximately 60 psi. Point being, I know cartridge style fuel pumps are readily available that provide the necessary 12 psi and even 43 psi like the one I am utilizing for my multiport EFI system. I'm not sure of one available for the higher 60 psi. Maybe Chris can remove the pump from the canister assembly that he saved from the Astro and install as Dphillip has done. If not, he may need to modify his fuel tank to accept the canister style pump assembly.
     
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  11. Mar 3, 2020
    BadGoat

    BadGoat How High Can You Climb?

    St Croix, USVI
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    Yes, if you want Novak or Holley or Tanks Inc. will sell you one already made up, but you can make your own. Tanks Inc. has all the parts you'll need and you can go fancy and do -AN connectors if you want.

    I do recommend adding an access door to the bed of your Jeep, above the fuel tank sending unit so you can get to it if you do have a problem.

    I used the Novak kit, but changed their pump to a Walbro 255 lph from Tanks Inc. The Novak pump broke at the outlet fitting (plastic). The one from Walbro is all metal. You also need a pressure regulator and need to know what pressure your system needs. You also need to know if the EFI system has it's own fuel return requirements or if it just needs a supply line. I have one of each. My CJ5 is a returnless system so it uses a Corvette style regulator that is mounted on the frame and brings the pressure down to 58psi, near the fuel tank. My 64 F100 has a Holley Sniper kit with an internal regulator and needs both a supply and a return line. Both options work fine.

    Fuel Pumps and Accessories

    Mike
     
    Last edited: Mar 3, 2020
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  12. Mar 3, 2020
    PeteL

    PeteL Member 2020 Sponsor 2019 Sponsor

    Hills of NH
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    Yes! I've cut one or two of these after-the-fact, but that's a bit scary.

    Why in heck vehicles don't come with them, I cannot understand.
     
  13. Mar 3, 2020
    45es

    45es Member 2019 Sponsor

    Naches, WA
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    This an interesting site which offer a large selection of parts. Listed are cartridge style pumps which look as though they can satisfy the requirements of the EFI system that 47v6 will be using. By using one of those pumps he could possibly do as Dphillip did in his straight forward in tank pump setup.
     
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  14. Mar 6, 2020
    Jrobz23

    Jrobz23 Member

    Northern, WI
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    Glenn, I’d second the Holley. I used a Holley FPR on my Dodge TBI to Carb conversion with a HP pump. The unit held nice adjustable pressure and mine saw 90F to -20F use.
     

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