Update on The Ghost fuel system!
I’ve been fighting an issue on the fuel system (which is freshly tuned up before the big trips last year). The symptoms were hard starting and loping cold idle after sitting for >1 week. If removing the return line from the head, you could hear fuel siphoning back to the tank via the supply like. Since there is a check valve installed in this line, I knew it was suspect. Below is what I found:
A pine needle had placed itself right across the flapper of the check valve, thus holding it open and causing fuel to flow backwards to the tank, draining the head and some fuel out of the filters.
I have since replaced this check valve with the newer check valve (spring/tapered potion) off of a 90 series Detroit I scored off ebay for $25 w/ some other spare parts. I also included (temporarily) a full flow chatter pump w/ internal check valve & bypass. This will help w/ priming the fuel system if the filters are changed or if sitting for an extended period of time. It is powered from 12V and would be on a timer or switch as it would normally not be needed (the engine has a gear driven fuel pump that uses engine rotation).
The goal here is to aide in cold starts and also diagnose any fuel starvation issues if they present themselves. I am also working on including senders on the primary filter housing to display vacuum across the filter. The main filter is pressure so a restriction there usually shows as a low main fuel pressure at high RPM.