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GT4 fuel system

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119
197
Exp. Type
Time Attack
Exp. Level
20+ Years
Melbourne Australia
That's a crazy setup!! How does the fuel get into the sump tank? Is that sump open on the bottom?
Was trying to work that out as well. Assume one of the barb quick connects is for a lift pump to fill the surge tank. Twin pumps but also assuming it a primary and reserve pump setup. There appears to be another connection on top that would be a return line from the pressure regulator. Assume they don't run a dead end system. Way too many assumptions, well, educated guesses.
 
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Pump on left ( at angle) fills the reserve tank. ( big blue thing) the other 2 pumps ( on right) are the main pumps that draw from the bottom.
There are also 2 more pumps that feed the reserve tank as well.
All that gets it to the mechanical high pressure pump that is driven off the cam. Then it goes into the direct injection port.
 
119
197
Exp. Type
Time Attack
Exp. Level
20+ Years
Melbourne Australia
Did you end up putting a check valve in to keep up the fuel pressure when you turn off the car?
I didn't, but it hasn't been a problem so far. It does have to crank a bit longer but hasn't been an issue. Given its a dead end fuel system it seem to hold fuel as it would have to pull a vacuum for the fuel to fully drain. I could see a return system draining more easily and being a pain to build pressure after a short time.
 

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