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+--- Thread: No fuel return line?! (/showthread.php?tid=7659)
No fuel return line?! - Fishman - 03-12-2017
Is it possible to run te mech pump without a return line? Was thinking of putting a low pressure hi flow fuelpump in the fueltank, feeding de ip-pump. Then connect the return line with a T between te electric en mech pump. Will this work?
RE: No fuel return line?! - barrote - 03-12-2017
It will. Question is how are u going to bleed the main gallery?
Instead of doing that use a 1.5bar check valve at pump return line. Actually the return exit is just for this purpose to bleed the system. And some excess pressure when engine is unthr .
U must by pass the mech lift pump at all cost. It reduces flow a lot.
Nevertheless u might find a good solution irespective of what i'm saying
Regards
RE: No fuel return line?! - Fishman - 03-12-2017
Thanks. I will use the 1.5 bar check valve.
RE: No fuel return line?! - starynovy - 03-12-2017
Would not do that.. spent fuel which leaks trough spill ports is hot as fuck. So if you drive on low power there is lot of it and temperature builds up quite fast. Same goes for VE pumps, there is tiny 0,15mm orifice with spring loaded plunger for even more recirculation at high revs.
RE: No fuel return line?! - Fishman - 03-12-2017
My problem is that my Jaguar has 2 fueltanks, wich can be switched with a switch. So when i use tank 2 and the return line is in tank 1, it can overflow.
RE: No fuel return line?! - matfield - 03-12-2017
Could you put an overflow between the two tanks, or join the two tanks and save the need for two in tank fuel pumps?
RE: No fuel return line?! - Fishman - 03-12-2017
Think that is the best option.
RE: No fuel return line?! - AlanMcR - 03-13-2017
The standard setup is to switch the return lines when switching the feed lines. This way one can run veggie in one and diesel in the other and not get them mixed up (much).