Rule of thumb: keep the fuel line at least a thumb's width away from the engine block at all times, and DO NOT put a fuel filter on top of the engine (it pretty much ends up like a coffee pot. With that in mind, Iv'e found that more than 90% of "Vapor Locking" vehicles do not actually turn out to be fuel perculation (vapor locking). Well, that's where all the heat is, and virtually no airflow to keep it cool!) Especially in a class C or Van chassis. (a common thing is to bring the fuel lines in from the rear of the engine. "Vapor locking", although common, is easily prevented, by keeping the steel fuel line and carb in the airflow of the radiator fan. Rubber fuel line all the way to the Carb, laying on the engine block.Įlectric fuel pump or fuel selector solenoid mounted too close to the exhaust.Ĭlogged Tank vent/ breather or Improper gas cap. (bad cap, rotor, wires, coil, a leaking carb, sludge in the carb will also produce these symptoms.) (if there are ANY cracks in the rubber fuel lines, or they are 20-30 years old, don't trust them, replace them!).Īll of this matters if the original fuel supply including the mechanical pump, is still intact as supplied by Dodge (or GM if it's a Chevy chassis).Īlso, I'll assume that you're confident that it isn't a carburator, or tune up / maintenance issue. Is this vapor lock? and did any of these things help to fix it?įrom whart you describe, it probably is not vapor lock.įuel filter clogged, rotted fuel lines to the pickup tube, bad fuel pump. At the last fill the air temp had cooled, I added higher octane gas, removed the fuel cap, let her cool for a while and didn't climb quite as much. Next fill I replaced the ignition modual. I stopped at a town to fill and replaced the air filter and added higher octane fuel. I was able to maintain a steady uphill speed of 40-45 mph that way for about 4 hrs. If I completely took my foot off the the accelerator for a couple seconds and then pushed it back to where it was, it would smooth out for a few seconds and then sputter again. Once the engine completely heated up (much higher than normal but still in the safe zone) the engine began to sputter on up hill grades and eventually much more often. Had her towed in because I destroyed the rubber fuel line trying to "McGyver" a bypass of the fuel filter and didn't figure it out.Īnyway, after a nice four day visit we got a late start home and had to drive through the desert in 110 weather. She ran Beautiful until the last 15 miles and konked out 5 miles from town (7500 ft elevation). all the way across the Mojave desert to Williams Az. Hi everyone, We just took our 77 Minnie Winnie "Turtle" on her first real voyage.
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