Island15
Veteran Member
I have a 1976 120 Lehman in my 1976 CHB. Can anyone tell me approximately how much fuel gets returned to the tanks at about 1750 rpms?
Thanks
Thanks
One more thing, there is a line out of the top of the filter housing that goes to the return line!
So if I take the return line off the top of the tank where it currently returns and just "T" it into the supply line before the fuel pump will that cause any problems?
That's exactly what I need . I have 5 tanks and valves scattered out everywhere. I just had a problem a few weeks back when I opened a valve by mistake and sucked one tank dry a almost overfilled another and wound up with air in the lines that shut me down .Island15
It sounds like you may be a candidate for a Groco 6 Port Fuel Valve.
This switches both the supply and return with a single lever and will permanently prevent the overflow you experienced. One valve, one handle, easy peasy
I don't think all Fords/Lehmans are plumbed the same. Last one I had in my shop for a rebuild I bench ran it and if I remember right it had a fair amount of return flow.
It's normal practice in the diesel world to have a drilled orifice or pressure control valve from injector pump to return. If you don't have that, it will not naturally purge air and can lead to stalling. On other engines like that (Yanmar GM) I have custom made a bleed rig to the return to get rid of the air problem.