Posted by Charlie Biler x on December 25, 2015 at 21:59:16 from (74.51.163.218):
In Reply to: lp gas posted by 16-30 oilpull on December 25, 2015 at 12:49:43:
Sir, If you have three different units with low fuel feed problems; I would instantly look at the fuel.
I would first check the feed pressure at the carb. Low pressure means a plugged filter, or someone has butane in the tanks. Pull the filter and see how much of that black goo and rust has plugged up the bronze fuel filter. If you do not have another filter; brake cleaner solvent usually dissolves the goo. It seems funny that three units all develop the same problems simultaneously.
If the engines are acting up in cooler weather, you may have a tank mix with butane content. Propane boils at -43 degrees and butane boils at 34 degrees Fahrenheit. I once had a new boss, from Mississippi, order a truckload of butane for one of our bulk tanks. Everything was really going well, until fall came along. Every machine on site was running well in warm weather because butane has two more hydrogen atoms and one more carbon atom than propane. Old tired engines run like the devil as long as butane is warm. When it gets cold; the fuel can not boil enough to even get up into the vaporizer. Even the electric solenoid units would barely idle with the "choke button" constantly depressed. I discovered the problem when I put a pressure gauge on the main feed line. A bucket of hot water over a fuel tank brought everything back to life. We ordered a bulk tank of propane and put the tanks of butane aside for indoor equipment.
A lot of southerners call all vapor fuel butane as a habit. We frost people call everything propane. I must make an effort to remember to not call butane or pentane "propane". Here is a quick way to check for propane. The tank pressure should follow the following guide. -44Degrees F Propane is 0 psi 0 Degrees F Propane is 28 psi 32 Degrees F Propane is 59 psi 72 Degrees F Propane is 128 psi 100 Degrees F Propane is 196 psi
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