Fuel Starvation Problem on Hornet

[Deleted User]
[Deleted User]
edited November -1 in HUDSON
Need sopme help...Ok... so I've had this continuing fuel stavation problem on my Hornet. It sometimes starts sputtering under a load (like going up a hill). I changed the fuel filter, didn't fix it. Then put on a back up electric fuel pump (manual on / off) and this DID fix the problem but ONLY when turned on. I just put on a brand new mechanical fuel pump and this didn't fix the sputtering... it only goes away when I turn on the electric pump. The sputting isn't constant, just under some conditions. I'm thinking I should perhaps disconnect the fuel line from the gas tank and blow out the fuel line with a high pressure hose? Thoughts?

Comments

  • [Deleted User]
    [Deleted User]
    Sounds like a problem with the carb. Maybe float level needs adjustment. Some one will correct me if I get this Backwards. If the float is too low it will not allow the fuel bowl to fill with gas thus starving the engine for fuel, turning on the Electric pump over comes the float letting it get more fuel into the bowl, no more starvation. I hope I put that right.
    Bob Hickson
  • [Deleted User]
    [Deleted User]
    Is the electric pump causing flow problems for the mechanical one when its switched off. Have you tried the new mechanical without the electric one in the circuit ?
  • [Deleted User]
    [Deleted User]
    Neils

    The best way to get to the bottom of your problem is to do a fuel pressure and volume check. Getting this done under load is the dilemma. Installing the pressure gauge in a manner that will allow you to view it under load conditions will take ingenuity.

    Guessing now, I will make an educated guess. The volume and pressure that a mechanical fuel pump outputs when attached to an unobstructed fuel line is determined by the stroke of the fuel pump arm. Arms on Hudson fuel pumps come in a variety of shapes and lengths. The full stroke on any pump is set by the height of the arm as it is installed inside the engine. The cam lobe then presses this arm to get the pump stroke. When installing the pump the arm should be placed at the highest possible point and at the base of the cam lobe. The two mounting bolts establish this height based on the size of the mounting holes in the fuel pump. Hudson and its vendors assured maximum fuel pump stroke by inserting a sleeve into each of the fuel pump mounting holes. Then the pump body was pushed UP when installed to maximize the achieved stroke. Aside from these mounting techniques, the heat insulating gasket pack is required for Hudson pumps and without it the maximum stroke cannot be achieved.

    Using the electric pump overcomes the lack of volume your engine is experiencing using the mechanical pump alone. Even with a properly installed mechanical pump the full stroke of the fuel pump arm may not achieve the fuel volume required by your particular engine.

    Hope these comments help.
  • [Deleted User]
    [Deleted User]
    You said it works great with the electric back up so you put in a new mechanical pump . But it still did not work, I have never seen this my self but I've heard of cam lobes wearing down. Thereby not pushing the pump lever as far as it should. Not sure how you could check for this however,
    Roger
  • TOM-WA-
    TOM-WA- Senior Contributor
    Oh Oh now you have done it. Whenever you have a question regarding Fuel or Electrical issues you open a CAN OF WORMS.

    It's been my experience that you will recieve a bevy of well meaning comments that will run the gammet of replys. You go from the logical to the bizarre rapidly. Some will have you checking out the Brakes and the directional signals.

    My advice is to forgo the most of the advice and bite the bullet. Take the car to a
    professional if you can find one or if possible have one of the HUDSON experts such as Wildrick help you one on on.

    By the way I think your problem is being caused by the cd changer or the factory installed seat belts....LOL



    TOM
  • [Deleted User]
    [Deleted User]
    Tom is quite correct , very hard to troubleshoot something you cant see,
    Roger
  • ArkieJazz
    ArkieJazz Member
    A couple of "culprits" to check. There could be a pin hole in the fuel pick up tube...and you might check the fuel flex line. Sometimes those flex lines are weak inside and actually collapse under pressure which causes interruption of fuel delivery
  • RonS
    RonS Senior Contributor
    Neils, What kind of electric pump do you have in line? Only recommended one for inline installation is a Solenoid type. Just because your mechanical pump is rebuilt does not mean it is putting out correct PSI or that suction from the tank is proper. Test the fuel pump WITH and WITHOUT the electric in line. As said The mech pump stroke can be adjusted by adding or removeing a gasket from the gasket pack. If the pump is too close to the block there is less leverage on the pump arm and therefore less travel/PSI. Test it first. Get back to us.
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