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Discussion Topic:
Hard starting '36
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Flatbob |
04-07-2012 @ 3:21 PM
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Member
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Joined: Oct 2009
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Recently had carb. & fuel pump rebuilt by the two "97" gurus and car ran better than it ever has. Car sat for a few days & was very difficult to start & would only run roughly with choke out and did not attempt to drive it. Saw some very small pieces of black debris in fuel; removed sending unit & looked in tank & could see the same debris. Removed carb. & disassembled but found no debris (inline filter.) Drained fuel tank & observed the debris caught by nylon filter placed over gas can. I let the tank dry out for a few days & shot compressed air through fuel line to the tank but saw no evidence of above mentioned debris looking through the the top of the tank. Filled tank with fresh clean fuel & freshly charged battery but still have the same problem. This engine has less than 300 miles on it but has low compression on all cylinders (70-90lbs.) Any ideas?
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trjford8 |
04-08-2012 @ 7:59 AM
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You did not state the year of your car, but if it's mid 37 or newer you should check the rubber sleeve that connects the fill neck to the tank. If this has never been changed or changed many years ago it is probably starting to deteriorate due to this new gas. Small pieces of rubber begin to flake off and land in the tank. If you touched the debris ,rubbed it between your fingers, and it turned them black it's definitely pieces of rubber. I had this situation many years ago. I replaced the sleeve and cleanaed the tank and had no more problems. The only other thing that may cause what you are seeing is old tank sealer coming loose in the tank.If your tank sat empty for some time and then you put in new gas, some of these sealers(older type) begin to flake off the tank.The older sealers don't do well with ethanol.
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Flatbob |
04-08-2012 @ 8:49 AM
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Trjford8, it's a '36. The tank is new from Drake and I couldn't see that it had been sealed with anything looking through the sending unit opening with a flashlight. I was thinking about this and it might possibly a bad fuel pump again, even though it was recently rebuilt by Ken ct. Ken rebuilt another pump for me at the same time so am going to put that pump on and see what happens. It seems like engine is starving for fuel & will barely run with the choke full out.....so maybe fuel pump?
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supereal |
04-08-2012 @ 9:45 AM
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Some debris in gas is normal. That is why an inline filter is necessary. Remove the fuel line at the carb, place the end in a container, and crank the engine. If you don't see an ample stream of fuel, the problem is between the tank and the carb. If you do see ample fuel, be sure that you see jets of fuel in the carb throat whn you work the throttle. If your fuel pump was not alcohol proof, the diaphragm may have been damaged. Many rebuild kits don't have fuel proof parts. Seeing debris is usually a sign that alcohol is present. Almost always, an emerging problem is related to the last work done. Finally, switch the ignition condenser with a known good one. A weak or open condenser will mimic a fuel problem, and sometimes allow the engine to run with full choke.
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deuce_roadster |
04-08-2012 @ 9:45 AM
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Was the steel line from the tank up to the firewall replaced? If not, it might be possible rust from inside the line is letting go. Even though you blew through it with air it might be old rust. Seems like you have covered everything else.
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Flatbob |
04-08-2012 @ 11:12 AM
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Okay, not the fuel pump, replaced it with the other rebuilt pump & got the same results; shouldn't have doubted Ken ct's work. Monday will get another condenser. The weather is perfect today, would have been nice to have gone on a Sunday afternoon drive!
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trjford8 |
04-08-2012 @ 12:56 PM
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Deuce roadster brings up a good point on the steel fuel line. If you have not changed that line it very well could be rusty inside. The rust flakes off and plugs the filter and also small particles will siphon back into the tank.
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Flatbob |
04-08-2012 @ 1:09 PM
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The fuel line was replaced during restoration, the line is about 10 years old but the car has less than 300 miles on it.
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trjford8 |
04-08-2012 @ 7:26 PM
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Disconnect the fuel line at both ends and blow compressed air through it. Have a rag on the other end to see if anything comes out of it. The fuel line may have been new 10 years ago, but if the car sat a lot it could still have a rusty line. A car that sat for ten years can have a lot of rust issues in the fuel system. "rust never sleeps".
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deuce_roadster |
04-08-2012 @ 10:13 PM
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You could take the steel fuel line out of the equation by carefully using a known clean gas can and some new fuel line to the pump.
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