Stepdown or Jet - Fuel and Vacuum Pump

Sarah Young
Sarah Young Senior Contributor
edited November -1 in HUDSON
Could You shed a light on what is the second adjusting screw that is located on fuel bowl cover. Has a spring under it and reaches down to bottom of fuel bowl and has a pointy nose for seat. Seems to connected to main circuit via channels. Does this simply hold the cover in place? Or does it serve more of a purpose?

Comments

  • RonS
    RonS Senior Contributor
    Sarah, what adjusting screw? Do you mean #26? That is the fuel bowl bolt. It is to hold the bowl cover on snugly. #1 holds the cover to the vacuum booster diaphram assembly. The only adjustment that I am aware of is at the actuating arm, ie, the raised part that rests against the cam lobe. The pump pressure can be raised or lowered a bit by adding or removing a gasket in the gasket pack. Is this the pump on your Jet? It is for 48 to early 53s. Pumps changed a couple of months into the 53 run to AC/AJ. The new 53-54 pumps don't have those bolts. The non- vacuum Carter M-729-SZ was standard on the Jet, with the upgrade to the AC.
  • Sarah Young
    Sarah Young Senior Contributor
    I was referring to #1 in the picture. A website viewer was asking questions on the pumps. I figured it "held the lid on" but wanted to verify that. I have bypassed the mechanical fuel pump on my Jet and run solely off an electric one, but have left the original bolted in place just in case (although one reason for this was because of fuel leakage around the tops screws).
  • TOM-WA-
    TOM-WA- Senior Contributor
    SARAH:

    Remind me to talk to you about your fuel pump when you get a chance


    TOM BARRETT
  • RonS
    RonS Senior Contributor
    Sarah, a reason gas is coming through the screw holes is because the fuel diaphram is "soaking". The fuel is not being repelled by the diaphram material any longer and is acting like a sponge. The pump needs rebuilding. The ethanol in the fuel is a large cause of this. Consider sending it to Then & Now Automotive in Mass. It will probably be the last time you will ever have to rebuild the pump, for $125. Too many compromises with all electric and safety considerations as well. Pm me if you want to know my experience on my stepdown. I don't want to bore everyone again. Ron
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