| silverchief | -- 06-27-2010 @ 8:17 AM |
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Took my 49 flathead to coffee this morning about 3 miles away. Cruised about 30 mph and it ran fine with no problems. Coming home is a long moderate hill about quarter mile long. Immediately after starting the climb it began to stall, buck, and lurch. Jumping and bucking I barely reached the top where it improved considerably and I was able to nurse it the few blocks home. Now I am afraid to take it out of the garage. The stock 6 volt engine starts easily and idles smooth. But it is somewhat rough when reving to fast idle. Didn't use to be. If it stalls after initial start, going to full choke will get it to jump off. I run an electric fuel pump full time, and my pressure regulator set at 2 or 2 1/2 In testing, it pushes a steady small stream of fuel into a container, but certainly not a forceful spurt. Trusting the fuel gauge, I ran out of gas recently. Now the glass at the pump shows a very small amount of granular residue at the bottom but is otherwise clear. Twice within past couple of weeks I drove it about quarter mile away to grocery with no problem. No hills involved. I think it has to be fuel, but really have no clue. Suggestions appreciated.
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| supereal | -- 06-27-2010 @ 9:51 AM |
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I'd bet on a partially clogged fuel line, probably rust and some dirt. As I have often mentioned here, I had the same symptoms with my '47. It started OK, ran well until it was on a pull or at hiway speeds, and then balked, and tried to die until I switched on my booster pump. I saw a steady stream of gas from the mechanical pump when I checked it, but replaced it, anyway. I put in a new flex line at the firewall, and replaced the inline fuel filter. I even swapped out the condenser, as a weak or failing condenser will mimic lack of fuel. The plastic tank is new, and all the clamps along the line were worm type and tight. That left only the fuel line from the tank to the firewall. It was rare to see a problem there, but I put 100 lbs of air on the line, and barely got any thru! After removing the old line, I straightened it out and tried to force a wire thru it. I could blow lots of crud out of the line. After installing a new line, the car came back to life, and my wife wasn't afraid to join me on the road. I know many are sick of hearing this story, but the moral is: don't take anything for granted, and remember, just because fuel comes thru the line, it may not be enough when more is needed! The line is only 1/4 inch, and just big enough, when clear, to deliver necessary fuel.
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| BMora | -- 06-27-2010 @ 9:52 AM |
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Last season, I had a problem where I could drive about 1/2 a mile down the road and then would start bucking and baulking before finally deciding to stall. After a short rest and full choke, I could get her started again and drive 100-500 feet before having another episode. I replaced the fuel, fuel pump, fuel filter, and fuel line before finally taking my gas tank to a radiator shop and having it boiled out (cleaned). I had a few small rust particles in my bowl like you describe, but the real culprit was the fuel exit in the tank was clogged with a sludge of these. For a temporary band-aid, I disconnected the fuel line from the fuel filter and connected the end leading to the tank to my hand bulb siphon pump, and gave it a few blast into the tank to relieve the blockage.
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| silverchief | -- 06-27-2010 @ 3:48 PM |
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Thanks guys. I'm going to take another look at the pump output. Also check carb bowl to see what if anything I find there. When trying to make the hill it would help for just a few seconds if I went to full choke.
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