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Quick ? for the carb guys

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  • #1

    Quick ? for the carb guys

    The electric fuel pump, a very generic off the shelf version, is on its way out. I'm upgrading to a Holley Blue with regulator since there are plans for engine upgrades for the vehicle. The pump that is in it right now is wired in to a 12v source that is keyed hot. That means I turn the key and it's activated and ready for duty. Holley's instructions state that a fuel pump relay, P/N 12-753, is needed. Can someone explain why, and its job? What if I were to wire in the Blue just the way the current pump is wired in?

    I'm lost when it comes to relays and I can't afford for this vehicle to be down at the moment.

    TIA
    --carlos

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  • #2
    Originally posted by projectPONY View Post
    The electric fuel pump, a very generic off the shelf version, is on its way out. I'm upgrading to a Holley Blue with regulator since there are plans for engine upgrades for the vehicle. The pump that is in it right now is wired in to a 12v source that is keyed hot. That means I turn the key and it's activated and ready for duty. Holley's instructions state that a fuel pump relay, P/N 12-753, is needed. Can someone explain why, and its job? What if I were to wire in the Blue just the way the current pump is wired in?

    I'm lost when it comes to relays and I can't afford for this vehicle to be down at the moment.

    TIA
    That pump may pull more than the switch can hold, so a relay (using that wire as a trigger) and a dedicated hot would give it the power it needs.
    "If I asked people what they wanted, they would have said faster horses." - Henry Ford

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    • #3
      So basically it boils down to it needing a dedicated HOT wire.
      --carlos

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      • #4
        Originally posted by projectPONY View Post
        So basically it boils down to it needing a dedicated HOT wire.
        Yes.

        Would it work the other way? Sure, but for how long? It would really suck for the fuel pump to overheat the ignition switch and leave you on the side of the road with few options.
        "If I asked people what they wanted, they would have said faster horses." - Henry Ford

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        • #5
          The funny thing about switches is that sometimes when they get overloaded it'll melt the contacts together instead of burning out. Meaning your pump might stay on one day which could start a fire.

          You say the cheap generic one is going out, what does this mean? Have you made sure it has a steady power supply and checked the flow/pressure? Also loose grounds will cause some strange problems.

          If the instructions call for a relay I'd use one.

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          • #6
            I always use a relay and put it as close to the pump as possible
            Originally posted by soap
            i can fix anything from a broken tractor to an aching pussy!!!

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            • #7
              x2, relay, then you can use a small switch to trigger the relay
              Interested in being a VIP member and donating to the site? Click here http://dfwmustangs.net/forums/payments.php

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              • #8
                use relay
                Vortex rear stand $75
                8.8 410s. $50

                **SKAGG NASTY**
                My goal in life is to not arrive at the grave in a well preserved body.
                but rather to skid in sideways, totally worn out, shouting "holy shit!!!.. what a ride!"

                1990 Foxbody GT for that ass
                11 4 door
                13 FX2 White 5.0

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                • #9
                  Another strong vote for relay.
                  Fuck you. We're going to Costco.

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                  • #10
                    Originally posted by BP View Post
                    You say the cheap generic one is going out, what does this mean? Have you made sure it has a steady power supply and checked the flow/pressure? Also loose grounds will cause some strange problems.

                    If the instructions call for a relay I'd use one.

                    The last couple of days its sound was a little erratic. Almost like when you turn the volume of a radio up and down. Performance wise, it would stumble on take off. Once up to speed it was fine. Idle was on the rough side, as though running out of fuel. On one occasion I touched the pump and it was hot, hotter than I would call normal.
                    --carlos

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                    • #11
                      Well, after a more detailed reading of the instructions I found a couple of sections I seemed to have overlooked. Apparently IT can be wired like the one that is in it right now but it's recommended to use a relay. So the relay is on order and the pump will be wired in with it next time I get a chance. For now, it's up and running.
                      --carlos

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                      • #12
                        Why not run a mechanical pump?
                        Putting warheads on foreheads since 2004

                        Pro-Touring Build

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                        • #13
                          Electric pump was already in there and an upgrade to electric would eventually happen.
                          --carlos

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