| rospar | -- 06-21-2014 @ 4:51 PM |
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I recently purchaed a 1941 Merc that had been stored fro over 20 years with few startups.We have it running now. It starts easily, idles well and runs smoothly on the highway for about 20 minutes when it begins to sputter and buck and then quit. It can be kept running a little longer by choking it and pumping the accelerator. After 30 or 40 minutes it will restart by pumping the accelerator and using the choke and run well again. The fuel pump and carbeurator have both been rebuilt, a new coil and sparkplugs have been installed. The gas tank was emptied and flushed and a fuel filter installed. Any Suggestions?
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| TomO | -- 06-21-2014 @ 5:43 PM |
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Your problem sounds like fuel delivery problem, but it could also be a spark problem. Unfortunately, putting in new parts is no guarantee that you have put in good parts. Check your spark for a nice blue 1/2" when idling. A weak spark could be caused by a bad coil or condenser. To check fuel delivery, you need a graduated 16 ounce or larger container to determine the amount of fuel delivered in a measured time. Disconnect the fuel pump line from the carburetor and direct it into a graduated container. Crank the engine long enough to get 2 ounces of gas in the container and then continue cranking for 15 more strokes of the pump. The pump should have delivered 6 more ounces of gas. You may have a partially plugged fuel line or the flex line is collapsed inside. The fuel delivery test will let you know if you are getting enough fuel to run the car. Tom
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| rospar | -- 06-22-2014 @ 4:07 PM |
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Tom - Thanks for your quick response. By following your suggestions we have determined it is a fuel flow problem. We it drove it again until the problem occured and then ran the flow test. We got less than two ounces in 15 revs. We primed it by turning it over with the ignition switch off. It then started easily and I was able to drive it home slowly in second gear at lower revs on the available flow. Since we have not found any problems with the lines to the pump I have decided to replace the rebuilt pump with a new one. Thanks again for your advice. Happy Driving - Bob
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| TomO | -- 06-23-2014 @ 8:44 AM |
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Bob, You are welcome. I hope that the fuel pump fixes your problem. Most of the time, problems like this are caused by the fuel line from the tank being rusted inside or debris floating in the tank and being sucked into the pickup inside the tank. If the problem persists after replacing the fuel pump, disconnect the line at both ends and direct the tank end into a container, while someone blows trough the line from the pump end. If rust comes out, replace the line. The tank should probably be taken to a radiator shop and boiled out and coated. The gas that was in the tank, probably left a coat of varnish on the inside of the tank and the Ethanol will dissolve it into a gel like substance that will clog the pickup. Tom
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| rospar | -- 06-30-2014 @ 7:38 PM |
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Problem solved,at least temporarily. Replacing the fuel pump improved the flow but only to abour 4 ounces in 15 pumps.So we redrained the tank, found some rust in the first quart but little more in the remaining 10 gallons or so. Rechecked the fuel line from the pump to the tank and blew out a bit of crud but did not improve the flow. We then disconnected the fuel line at the pump, removed the gas cap and blew air into the line to try to clear any blockage at the pickup. It worked and we got the desired flow, confirmed by a few successful road tests. THANKS. Happy Driving. Bob This message was edited by rospar on 6-30-14 @ 7:42 PM
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| TomO | -- 07-01-2014 @ 6:31 AM |
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Bob, You are correct in stating that you have a temporary fix.Your tank and fuel line will continue to rust and will clog the fuel line again. It may also develop a leak. You should plan on having the tank boiled out and coated by a reliable radiator shop. The ones that service trucks usually provide this service. I would replace the line while the tank is being serviced. Tom
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| supereal | -- 07-02-2014 @ 11:40 AM |
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Every old car with an original gas tank should have an inline filter installed as near to the tank as possible. They are inexpensive and readily available at most parts places. Be sure to use the worm gear type clamps for the short rubber hoses that go between the filter and the line The spring type usually leak fuel or admit air.
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| blarge | -- 07-07-2014 @ 5:03 PM |
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I have a NOS fuel tank in the original Ford shipping box for sale at $300 plus shipping, if you are interested. Bill Large 586-677-4790 Michigan
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