Re: Gas tank pick-up tube/sending unit assy for '39???

Posted by HH56 On 2018/5/18 10:22:33

If the pump is not drawing air as you suspect the only other thing I can think of is the regulator is working like a needle valve and is restricting the flow along with the pressure. Is there an easy way to eliminate the regulator temporarily just to see if the flow is changed?

Maybe use something like a coffee can and run the pump X seconds with the regulator to see the level and then remove the regulator and run the same X seconds to see if the level fills to the same point in the can. If it does then the regulator is probably not an issue but if a significant difference maybe try a different type or brand regulator or see if the carb can handle the pressure without the regulator..