While I'm no hydraulic or fluid dynamics expert, I can tell you that your pump should be as low as possible, for most fuel pumps, once they are warn a little, have trouble sucking fuel up more than a few inches. Due to the friction in the pipe a long suction pipe can cause the pump to be inefficient, over sizing the suction fuel line can alleviate this but the larger the suction pipe, the harder to prime, also getting air in the line can cause the fuel pump to cavitate and not to prime. These have all been learnt the hard way, but luckily only in racing boats and stock cars (though I hate loosing to mechanical problems).
I'm adding wing stub tanks in the near future and the pump will be under seat behind the main spar mounted to the floor. As low and as close to the tanks as possible. And I'm only pumping up to my header tank. As far as pumps go I only use German made PIERBURG electric fuel pumps, since switching to them I have not had a pump failure yet (you know what's going to fail in my ski boat now, don't you :-) Regards Barry Kruyssen Cairns, Australia RAA 19-3873 [email protected] http://www.users.bigpond.com/kr2/kr2.htm ----- Original Message ----- From: Jack Cooper I have been reading recent post and archives about removing the engine driven fuel pump and going with dual electric pumps. I'm also considering not using my header tank and using only wing tanks. My question is will the firewall mounted electric pumps pull fuel from the wings or do I need another pump to boost the fuel from the wings to the firewall? I have looked over WW's 601 and did not see any pumps except the firewall pumps.
