Fuel injection return fuel line.
Fuel injection return fuel line.
(OP)
I would like opinions of where the return fuel line from my injection set up should go, either the fuel tank or collector pot.
I have a 35 litre fuel tank with a 3 litre internal collector. There are 2 low pressure pumps feeding the high pressure unit in the collector.
If I put the return into the collector I will be able to maximise fuel usage but will I encounter problems with foul fuel. What would these problems be?
How is it best to feed the return fuel into the collector? At the top, bottom, against the side, down a coil or spiral of pipe?
The vehicle is for road, hillclimb and track day use.
Thank you
John
I have a 35 litre fuel tank with a 3 litre internal collector. There are 2 low pressure pumps feeding the high pressure unit in the collector.
If I put the return into the collector I will be able to maximise fuel usage but will I encounter problems with foul fuel. What would these problems be?
How is it best to feed the return fuel into the collector? At the top, bottom, against the side, down a coil or spiral of pipe?
The vehicle is for road, hillclimb and track day use.
Thank you
John





RE: Fuel injection return fuel line.
RE: Fuel injection return fuel line.
Blacksmith
RE: Fuel injection return fuel line.
Can any body expand on the problems of foul fuel in an injection system?
What happens to the fuel (apart from getting warm) and why does it damage fuel lines?
John
RE: Fuel injection return fuel line.
One argument for not pumping it back to the tank is that it would eventually heat all of the fuel, and the tank would be forced to vent the vapors. Not a strong argument, at least if you aren't concerned with emissions.
Another argument, that since you are in hill climbing and stuff is that if the low pressure pumps are both uncovered, then, the reservoir would be drained sooner without the return fed to it.
I would recommend using two identical high pressure pumps in the system - one feeding the swirl pot, one feeding the fuel rail. And run the return to the reservoir swirl pot. And run a return line to the tank from the swirl pot.
Jeremy
Injection Logic
RE: Fuel injection return fuel line.
RE: Fuel injection return fuel line.
I intend to insulate the hoses and fuel rail in the engine bay.
My hose supplier (Aeroquip distributor) says the act of injection causes oxidisation in the fuel. I can not understand how this happens because it is not the injected fuel that is recirculated.
I have also discovered that the only hose recommended for in tank use is teflon.
John
RE: Fuel injection return fuel line.
I used to run the return fuel to the collector pot but reading the above points re heating I probably won't anymore
RE: Fuel injection return fuel line.