quote:
Originally posted by Jim:
Return line?? With a carbureter?? You must be thinking of an injection system.
Electric pumps usually run higher than 7 PSI. You will probably need a regulator.
Have you checked float levels?
I had a problem with weak spark, but that resulted in backfiring when the back two barrells opened.
Yes, A return line with a carburator!
Otherwise you get a maximum pump fuel pessure
with low fuel demands.
And if there is no restriction in the return line, there is less resistance in the return fuel line than in the carb. fuel input line, so most of the fuel goes back to the tank, and there may not be enough left for the engine.
Another problem that can occur when there is no return fuel line, is that at very low speeds on a hot summer day, when you are cruising in the city, the fuel consumption is so low that the fuel heats up too much, because it takes up much heat in the long period that it travels too your carb, you could get your fuel boiling in your float chamber.
With a return line just before your carb. there always is enough fresh cold fuel with the right pressure for your carb. fuel intake.
Greetings Paul.