after filling racor and secondary engine starts and runs above 1000 rpm , if idled back it quits and filters are empty, I heard there is a check valve in the fuel pump on this engine and if bad will allow the fuel to return to the tank? Could possibly the pump be weak , and at higher rpm its pulling fuel from the tank but at idle it can just suck the filters? Also my other engine runs fine off the same tank so im sure the tank pick up is ok,

any thoughts ?

8-71 TI

Thanks Mike