fuel pressure
hi there I have 2 questions about fuel pressure on my classic
fuel system is Rcm pump feeding Swirl pot then Bosch pumps 044 type feeding fuel rail, an6 teflon hose through car to pressure regulator 660 injectors fitted . pressure gauge at rear also Question number one the pressure is 4 bar ,is this too high. When the engine is switched off the fuel pressure drops to Zero . Question number two is this normal for subarus . I was thinking that there should be residual fuel pressure for at least some time any help would be helpful thanks geo :wonder::thumb::thumb: |
pressure
where exactly on the fuel system are you measuring pressure?
is it the very last point before an aftermarket fpr.. pressure on a 1-1 ratio fpr will rise as much as your boost via the hose attached-ie another 2 bar if you run 2 bar of boost to 6 bar total as i understand it-which your pumps must be capable of or the system will not provide efficient fuel pressure to the injectors the system will hold some residual pressure in the line from the pump to rail[one way valving on pump/s but the 4 bar is the running pressure provided by the pumps pumping the fuel through the tiny gap created by the fpr.... |
Originally Posted by g p motor sport
(Post 11778506)
hi there I have 2 questions about fuel pressure on my classic
fuel system is Rcm pump feeding Swirl pot then Bosch pumps 044 type feeding fuel rail, an6 teflon hose through car to pressure regulator 660 injectors fitted . pressure gauge at rear also Question number one the pressure is 4 bar ,is this too high. When the engine is switched off the fuel pressure drops to Zero . Question number two is this normal for subarus . I was thinking that there should be residual fuel pressure for at least some time any help would be helpful thanks geo :wonder::thumb::thumb: When I installed my Bosch external/swirlpot, fuel pressure increased to nearly 4bar, I just tweaked it back to 3.7. I would have thought 4bar was ok providing that's in the map and not as a result of changes made unseen by your mapper. hope this helps Trev |
pressure
another thing to remember is that there is vac at idle[half a bar maybe] negative pressure,so although we all set it pipe off/plugged at say 3.5 bar for a high performance engine -that changes a little as we raise the idle to have zero vac/boost
some folk recommend setting the fuel pressure with pump on,engine off for a more representative reading of actual fuel pressure |
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