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Which electric fuel pump Vortec longblock?

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  • Which electric fuel pump Vortec longblock?

    Putting a reman Vortec headed 5.7 longblock in my 1992 Rinker Captiva 206 and need to run an electric fuel pump. Which one is a good choice and how to wire it?

  • #2
    use the search function on wiring. must be a few hundred posts showing proper wiring

    I would get a Carter P4389 universal marine electric fuel pump (about $65)

    you will need a VF4 relay (about $3) and an oil pressure switch (about $10)
    Cheesehead boating the Gulf Coast of FLA 27.51° N, 82.53° W

    1988 Cruisers Rogue 2420 -VP 290 DP now powered by custom 468 - https://forums.iboats.com/forum/owner...988-rogue-2420

    Past Boats
    1970 Wooster Hellion - Merc 9.8
    2002 SeaRay 190BR - 5.0 - A1G2 - "Cheeseheads in Paradise"
    1984 Avanti 170DLI -3.0 stringer- "Ship Happens"

    What’s behind you doesn’t matter.Enzo Ferrari

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    • #3
      Wire like this:

      Click image for larger version

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      17 Foot '90 Bluewater
      Alpha 1 3.0 Merc - repowered in 2016
      now - 4.3L Vortec - Alpha 1 GenII
      Honda BF100L kicker
      Engine custom - Transom 0D65328 - Drive 0D648864
      If you ain't fishin, then yer working too much.

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      • #4
        Very cool Scott and Rick...thanks !!

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        • #5
          Standard motor PS64 for the oil switch

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          • #6
            I used a Holley Red - Marine pump when I did the conversion. I too had a mechanical pump prior. One thing to remember is that electric fuel pumps do better pushing fuel than pulling fuel. I had problems with losing prime when I first switched using a Carter pump. When I switched to a Holley Red it seemed it solve the problem but it reemerged later. You need to be careful not to use too fine of a pre-filter for one thing I think 20-or 30 micron is max.. I also re-plumbed mine so the the Mercruiser water separator was after the fuel pump thinking I was getting cavitation. As it turned out I was getting a tiny air suction leak at the Floscan sensor before the fuel pump that during prolonged idle would allow the fuel pump to loose prime and starve the VST tank so the engine would die. It only did this at idle and there was never any gas leak. (A section of clear tubing to insert in the fuel line is how you find small air leaks BTW) Once I found the problem it has been flawless and I have tried it with both pumps (although I still am using the Holley Red). I'm sure the air leak was present with the mechanical fuel pump too but they seem to handle very small suction leaks better I think. Others have covered the wiring and the oil pressure safety switch. Good luck. The Vortec heads make a very noticeable difference in performance Good choice!!!.

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            • #7
              Hnt....good info...thanks. I've been combining a list of parts to get and gather in preparation for yanking the motor

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              • #8
                I used the Airtex pump that was OEM when my motor was used by Mercruiser. That let me get any fittings, mounts and the stainless preformed fuel line between pump and carb.

                Using the factory mount puts the pump on the end of the head, after the water separator. I had the same issue with the fuel draining back down and losing prime. So I added a marine check valve between separator and pump.

                Click image for larger version

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                17 Foot '90 Bluewater
                Alpha 1 3.0 Merc - repowered in 2016
                now - 4.3L Vortec - Alpha 1 GenII
                Honda BF100L kicker
                Engine custom - Transom 0D65328 - Drive 0D648864
                If you ain't fishin, then yer working too much.

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                • #9
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                  I wish I had used the Mercruiser fittings and lines. I became a virtuoso line bender making up lines for two different carbs and two different fuel pumps.
                  I'm so bullheaded, I had to do it myself. Waste of time and money in the long run, but they are done and nice now!

                  I ran an Airtex for 2 years. Pulled it when I had a different problem. I'm sure now that I didn't have to toss it. But it's gone now.

                  I wasn't satisfied til I got a Holley Marine pump, which is rated for everything my carb could demand. It seems not to drain back, much if at all. If I don't run the boat for a week or so I get fire in 3 or 5 seconds of cranking. If I watch the fuel pressure gauge it jumps around for a good 10 or 15 seconds til the bowls are full and things get steady. But the engine can't tell, so it must be getting fuel.
                  Last edited by NHGuy; August 16th, 2019, 07:29 PM.
                  87 Formula F223LS, 2016 383 Stroker, 2019 Davis Unified(HEI) Ignition, Quickfuel Marine 750
                  Lake Winnipesaukee, NH

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