1983 Itasco windcruiser fuel pressure issue rebuilt carb replaced fuel pump bypassed valve in fuel line to check value same issue running 6psi of pressure at idle or low throttle running 0 psi at full throttle or heavy load driving uphill etc. what could it be?
Hello , my name is JoeI see your question has been up for some time. I will do my best to help , and have a couple of questions of my own:
Thanks , -Joe
I believe both load and full throttle. There is something that looks like a proportioning valve that was bypassed just to see if the valve maybe the issue. i think what they bypassed was the valve that selects which tank the fuel is drawing from? but I am not sure I did not do this was only told.
Ok , thanks for the replyThe most common problem with these older carburetor fuel systems is that the lines between the fuel tank and the mechanical fuel pump on the engine will deteriorate or corrode , and allow air to be drawn into the lines. The symptoms begin to show when there is a high fuel demand. In your case , the problem could also be accentuated by a dual tank setup or a faulty fuel selector valve.The best solution is to install a small electric booster pump in the fuel line - as close to the tank as possible. 3-4 psi is sufficient as you just need to help feed the mechanical fuel pump on the engine.Be sure to wire the pump through an oil pressure switch so that the pump only runs when the engine is running.An auto parts store such as NAPA should be able to set you up with the necessary pump and oil pressure switch.-Joe
Associates Degree in Automotive Technology , 18+ years as RV and Commercial Bus Technician
Joe put pressure back thru the line to blow off "sock" fuel pressure went to 7psi road tested and pressure went back to 0 Stuff in tank? leaning towards having to pull and replace tank any suggestions?
Ok ,There will not be a sock or filter screen inside the tank. A sock is only used on fuel injected systems. Your tank or tanks will most likely just have a steel tube extended down inside the tank for fuel pickup. It is certainly possible that there are enough pieces of rust or debris that are plugging the tube.-Joe