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Fuel Pump and Cursed Avanti

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  • #16
    Wagonne! I've been away for awhile and and almost surprised that your still having the same problem. I have personnally decided that the fuel delivery system on the Avanti is crap. I have been dealing with it since day 1 and still have problems. Have you checked the drain fitting. It's located about midway under the car on the drivers side. It's a brass fitting in line with a square headed bolt in it to take out to drain the tank. There was alot of rust in mine when I removed it and reinstalled it on the new line. I had to beat the rust out of it. Also I remember a vent line running from the top of the tank over the to the passenger side and going up somewhere. On mine, I changed everything but the return line, which I blew out. But I think my problem is still in the pump somehow.
    Charley

    63 R2 Avanti

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    • #17
      Charley: Thanks for the tip about rust in the drain plug beneath the driver's door. I get zero crud in my plastic see-through filter or pump--so I haven't done anything other than blow out the suction (delivery) line, and the vent line, and install a new return line. But I suppose there could be crud (rust, sediment, etc.) in the delivery line and not show up in the pump/filter. I think I'm going to remove the tank and possible install a new delivery line (and also replace the pump as it must be missing a seal). It has become a mite frustrating and I guess I should have done the tank and delivery line sooner, but the line seems clear when I blow compressed air through it and seeing no evidence of crud has made me, logically, not want to mess with the tank and fuel line--that fuel line must be a bear ro replace! I'm going to throw one h*ll of a party when I finally get to the bottom of this (course for me "h*ll of a party" doesn't amount to much compared to others, I suppose). Thanks for your input, and thanks to all--the Avanti will rise again, I hope.

      wagone and cursed Avanti I

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      • #18
        You probably already checked this, but there is a short hose from the line to the bottom of the tank. Mine was rotten. Yours could be collapsed inside. That would be an easy check before you yank the tank. Thats a real "pain in the a**" job I don't wish on anybody. But now the fuel line replacement job wasn't a big deal. Took me about 2 hours. That tank has 2 or 3 baffles in it and if you do the sealing part yourself, your gonna have to really move that thing around to get the stuff through the baffles to coat all sides. If I had to do over, I would probably have found somewhere to send it. If you got no crud and the car didn't spend a few years sitting somewhere with a empty tank(as mine did), then the tank is probably O.K.. I couldn't imagine anyone who feels your pain worse than me. I haven't driven my Avanti in 2 months. Don't even want to. Its got just under 35000 actual miles on it and I know now why. I love the car but it would be nice to have a car that you don't feel like you need to pull a trailer behind with all the necessary emergency parts and tools. I'm not dogging Studebaker so don't anybody get their feathers up. I'm just talking about mine. And really, if it was perfect and didn't need attention, what kind of hobby would that be? So I guess I'll shut up...

        63 R2 Avanti

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        • #19
          Charley (and others): Thanks for your thoughts. I have replaced the short hose coming off the elbow at the tank--mine was NOT rotten, but it was sharply kinked (I used the SAE 9 fuel injection type as a replacement thinking that it would be better able to resist future kinking). My hose is sharply kinked because the nipple end on the elbow faces towards the front of the right rear tire and of course the steel line comes at the elbow from the left side or behind the elbow--not a good situation and hence the new hose is probably already kinked...need to crawl under the car and look. Kids may have (being what they are--and this is not undue criticism) pushed any number of things into that tank at one time or another--who knows. So... I'm trying to screw upself up to tackle the job of removal. There may be nothing inside of it but I don't want to drive it again and risk a several hundred dollar towing bill. As for wishing you had sent your tank to someone to have them coat it, I've had trouble with Stude vendors (and others) not performing up to expectations--and you don't know what kind of job was done until you've paid the bill. My steering wheel needs to be recast (I'm presently using a rather cheap Grant wheel) and I'm very unwilling to pay $700-$1000 when you just can't very well find out what their level of expertise is. So IMHO we are all better off doing whatever repairs we can ourselves. As for not being able to drive our cars, I feel your frustration and pain also--and we are not digging Studebaker, but these cars are over 40 years old and sometimes (generally?) need a lot of TLC. Problem is, mine was anything but cheap to buy and in the last couple years I've put another $8000 in it (and I paid WAY more than that when I bought it)--these cars stretch the definition of a hobby. They are more like a form of insanity--but as you say the therapy is good and analysts worth a hoot "ain't" exactly available for peanuts, either. The damnable thing about my recent experience is that it drove fine for about 100 miles before it started acting up--which tends in my mind to re-enforce the thinking that the problem is something inside the tank--course the new fuel pump was also puking oil all over the place. Anyway, I don't want to give up on it, but I might be close to that point. We need to stay in touch, as our cars are kind of paralleling each other.

          wagone and cursed Avanti R2

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          • #20
            Many years ago when I first started circle track racing a 62 Hawk I would make about three laps and the car would die. I pulled my hair out trying to figure it out. I finally did find the problem when I replaced the engine and found a small piece of gravel in the angle fitting that fed the fuel pump. It acted like an orifice and would only allow a small flow of fuel to the carb,probably enough to let the bowls fill up but not enough to finish the race. I have no idea how that piece of gravel could have gotten in there.

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            • #21
              Wagone,
              I did a fuel pump swap on my Avanti last weekend and found a couple of things. First, I had put the top gasket on the pump on bassackwards, although somehow it works. But mainly what I found wrong was the return line. Like you, I blew out the line to the tank and found no blockage. This time I looked at where the return line goes on.There's a brass fitting that screws on to the fuel pump. That fitting has a place for the line to the carb. and another for the return line. The one for the return line is a fitting in itself. Take it off and you'll find that tiny hole that we've been hearing about. Mine was blocked solid. I had to use my torch tip drill bits to litterally drill it back out. My upper rpm lag is now officially GONE. I think it an oversite bordering moronic that they (Stude engineers) would have designed such a thing on the before side of the filter. Even a clean tank can produce enough debree to clog this tiny hole. I am planning to reroute my fuel line away from my exhaust manifold (mines about 3\8" away), and when I do, I'm putting the fuel filter before my fuel pump and I would suggest everyone who has this same system do the same. Or just install an electric fuel pump.

              63 R2 Avanti

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