duel stage fuel pump question

Unknown
Unknown
edited November -1 in HUDSON
:confused: Ok, the '54 Hornet is running pretty good at times. It has a AC glass bowl type fuel filter right in front of the front carb. (twin H) and Ive noticed a lot of air bubbles going through the filter. I replaced the rubber hose that goes from the intake side of the fuel pump to the metal line going back to the tank, I've check where the metal line goes in to the tank, I've blown compressed air into the gas tank and pressurized the tank and fuel lines....still no leaks. My question: Is it possible that the duel stage fuel pump is pumping air into the fuel line? I'm stumped.

Also, I had a leak around my oil pump. The flat round gasket that sits in the groove around the pump was shot. I replaced the gasket...put everything back together...re-timed and thought everything was "hunky- dory". I went for a ride and when running approx 45 going up a hill, under a load....sounds like my fan scraping on something....never done that before. I've inspected my fan and radiator and everything surrounding and CANNOT FIND where anything is hitting the fan. I can't for the life of figure out what else could possibly make a sound like that.

Any ideas, advice, or comment will be greatly appreciated!!!

Thanks in advance, Tommy T

jackslash@verizon.net

Comments

  • Unknown
    Unknown
    Oh yeah...I did away with the old style fuel filter and put one of those high performance chrome and glass jobbies (I hate it) on there and I'm still bubbling. So it cost me $15.00 to figure out it wasn't my old filter housing.
  • Unknown
    Unknown
    Check for worn or broken motor mounts, or a bad trans mount(s)



    also, if you want a cheap quick way to troubleshoot the fuel pump, go to Autozone, get an 1983 AMC pacer 6 cylinder fuel pump, and give it a shot. it should be a direct bolt on, use your gasket stack on your pump.
  • [Deleted User]
    [Deleted User]
    Tommy T, It is not unusual to see some bubbles in the fuel filter like you are describing. The filter, or the sediment bowl themselves will cause a little separation of air and gas as the gas enters the filter/bowl. I moved my fuel line to the fenderwell and put one of the glass flters inline like you described. It has always had a few bubbles but I have had it to 90 mph and it did not effect it so I just left it alone.
    As for the Noise, check your balancer and lower pulley for scrapes, just a thought.
    Bob
  • SuperDave
    SuperDave Senior Contributor
    Lots of good advice so far also...The bubbles could be the result of a small leak in the supply line from the tank to the pump. The pump can suck air in through a very small leak. Check where the outlet from the tank connects to the steel line on the chassis(body). There is usually a short rubber hose connecting the two. If it gets worse, The car will starve for fuel.
  • nick s
    nick s Senior Contributor
    does it blow bubbles with a full tank? or just a partial? it could be a pinhole in the pick-up tube. your pressure test would not have identified a leak inside the tank.

    as for your noise, a bad mount and a heavy ping may be causing the noise, check your mounts and try backing off the timing a bit.
  • Unknown
    Unknown
    The filter doesn't 'percolate ' when first started and engine is cold. It doesn't do anything weird while it's idling in the driveway. If I go for a 3 mile drive, when I return and pop the hood.....BUBBLES! Not just a few, but percolating. I went for apprx a 10 mile drive this past Sun. and didn't think I was going to make it home.....car was surging and idling rough when I made it back. After searching previous posts, I'm going to do away with the metal line between the carbs and fuel pump and re-route with rubber line and an inline filter. If that doesn't work, I've purchased a 1983 AMC Concorde fuel pump....guess I'll try that. Thanks for all the great advice....I'm hoping to figure it out soon.
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