Hello all, I am still having Issues with my 1945 Chevy pick up breaking down. The engine is all all stock, Rochester carb, mechanical fuel
pump, oil bath, still 6v. Over the last few months it has left me stranded many times. The symptoms are that I will be driving typically at a speed above 35 miles an hour when it starts to hesitate begins to stammer and then dies. Once pulled over, it will not start. After sitting awhile, it Will eventually start up again but most times when you start to takeoff and go the same thing will happen. To troubleshoot so far, My first check fuel flow to the carburetor when the fuel line is disconnected from the carburetor and I turn it over sitting in the Park position it will give a strong stream of fuel every couple seconds indicating what appears to be strong fuel flow. (at rest of course). I’ve not only disassembled the carburetor to clean it but I actually replace the carburetor with a new old stock one and then have even since rebuilt that one a second time to make sure things like the Excelerator pump and other issues were not the cause; The fuel pump has already been replaced in the last couple years with an aftermarket one. (mechanical of course). I also recently flushed out the tank which had been previously restored a few years back I put a new visible plastic fuel filter on the fuel line between the tank and the fuel pump. The fuel line from the pump to the carb is the original hard line That goes up the front of the motor and then over to the carb it has two or three Bends and curves, but it appears to be the stock “route”. Just to rule out any electrical problem, I have since replaced the points the cap rotor plugs plug wires and even the coil, re-timed the engine it will always start when parked and will I will just fine even after 5 to 10 minutes; it will still continue to idle without any issue the problem only happens when the truck is moving and typically in third or fourth gear at a speed of 30 mph or higher. I Recently considered the problem may been related to my aftermarket fuel cap being non-vented and maybe creating pressure in the tank or something? but I even attempted to drive the truck home the other day with the fuel cap entirely removed and half way home the same thing happened. A friend and mechanic, is now talking about vapor lock as a possibly. But if the Fuel system and the route of the fuel lines are the way they have always been from the factory, how could this be such an ongoing problem? it was also early in the morning around 64 degrees outside when it happened most recently. I am fairly certain it’s a fuel issue because once it breaks down I am able to restart the truck using starting fluid shot directly down the carburetor. Any help or thoughts would be greatly appreciated as I an at my wits end here. Thank you all!
Last edited by HarveyRanch; 07/21/2023 2:31 PM.
