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Blocking off fuel return

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    #1

    Blocking off fuel return

    I just bought a 93 auto sedan today. The previous owner attempted to replace the fuel pump only to damage the return line on top of tank, so when started it spews fuel out on the ground. I was able to tow it to a nearby friends place but I need to get it about 10miles to my house to drop the tank and repair the line. Question is, would it be possible to cap off the return line at the rail just long enough to drive the short distance?
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    #2
    not really... the fuel system needs a constant flow through the fuel rail, to make sure fuel is available to each cylinder. It does this by over-filling the rail to its pressure limit, and the excess gets returned back to the tank. If you capped off the return, something would burst from the pressure...


    - 1993 Accord LX - White sedan (sold)
    - 1993 Accord EX - White sedan (wrecked)
    - 1991 Accord EX - White sedan (sold)
    - 1990 Accord EX - Grey sedan (sold)
    - 1993 Accord EX - White sedan (sold)
    - 1992 Accord EX - White coupe (sold)
    - 1993 Accord EX - Grey coupe (stolen)
    - 1993 Accord SE - Gold coupe (sold)
    Current cars:
    - 2005 Subaru Legacy GT Wagon - Daily driver
    - 2004 Chevrolet Express AWD - Camper conversion

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      #3
      The regulated pressure is in the 35-40 psi range. Based on a brief test I did once to see if the pump could develop reasonable pressure, a blocked line results in the pressure going up to about 60 psi. The pump is essentially a centrifugal pump, not positive displacement (like a piston, gear, vane, or gerotor), so the pressure won't go sky high. Keep in mind that the injector timing the ECM calculates is based on the regulated pressure.

      I'm not sure of the capacity of the pump, but I suppose if you felt sporty, you could route the return line to a gas can (although that would need to be vented). If it gets too full, stop and pour it back into the tank.
      90 LX 4dr 5 spd 396,014 (sold 1/1/2022) - MRT: http://www.cb7tuner.com/vbb/showthread.php?t=201450
      08 Element LX FWD AT 229,000 - MRT: fleetw00d : 2008 Honda Element LX - CB7Tuner Forums

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        #4
        Originally posted by fleetw00d View Post
        The regulated pressure is in the 35-40 psi range. Based on a brief test I did once to see if the pump could develop reasonable pressure, a blocked line results in the pressure going up to about 60 psi. The pump is essentially a centrifugal pump, not positive displacement (like a piston, gear, vane, or gerotor), so the pressure won't go sky high. Keep in mind that the injector timing the ECM calculates is based on the regulated pressure.

        I'm not sure of the capacity of the pump, but I suppose if you felt sporty, you could route the return line to a gas can (although that would need to be vented). If it gets too full, stop and pour it back into the tank.

        lol, just take a hose and run it from the return to the gas inlet on the side of the car :P Technically it should work.

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          #5
          Originally posted by Raf99 View Post
          lol, just take a hose and run it from the return to the gas inlet on the side of the car :P Technically it should work.
          I thought about doing just that lol

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