Show whole topic
Dec 11, 2013 7:06 pm
Dec 11, 2013 7:06 pm
Subject: Re: LG45 Fuel pump
Hi David
I installed this system when I rebuilt my LG as I had put a similiar one on my M45.
I modified the fuel pressure only because I had been experimenting on another car (1950s Jaguar engine) and realised that these SU pumps deliver fuel at far too high a pressure. It is about 4 psi and I ascetained that 2 psi is more than enough provided that you have the flow rate. I suspect that you could probably even reduce the pressure to 1.5 psi as long as the flow rate is sufficient. The standard pressure is in my opinion far too high for the simple SU carb needle valve and this is one of the causes of flooding (possibly Burlen will not agree with that !). I made up a simple test rig to check the fuel pump pressure so that I knew what I was dealing with. I used a "Pro-Flow" Regulator (about £30). It is hidden away out of sight on the tank in the outlet pipe. It is very easy to adjust and you can experiment as to what suits your car (or your driving style !).
Hi David
I installed this system when I rebuilt my LG as I had put a similiar one on my M45.
I modified the fuel pressure only because I had been experimenting on another car (1950s Jaguar engine) and realised that these SU pumps deliver fuel at far too high a pressure. It is about 4 psi and I ascetained that 2 psi is more than enough provided that you have the flow rate. I suspect that you could probably even reduce the pressure to 1.5 psi as long as the flow rate is sufficient. The standard pressure is in my opinion far too high for the simple SU carb needle valve and this is one of the causes of flooding (possibly Burlen will not agree with that !). I made up a simple test rig to check the fuel pump pressure so that I knew what I was dealing with. I used a "Pro-Flow" Regulator (about £30). It is hidden away out of sight on the tank in the outlet pipe. It is very easy to adjust and you can experiment as to what suits your car (or your driving style !).