There is a spring-loaded valve which opens at ~350kPa of pressure, creating an outlet and line pressure of ~350kPa. Then at the fuel rail we have a pulsation damper along with a very fast pressure sensor and temperature sensor. Then in the MoTeC ECU we simply compensate for pressure and temperature in the opening time of the fuel injector. Compensation tables FTW.
As you can see it is vented back to the tank from the top outlet.
I think that this should prevent the backpressure from building up too much.
However I see your point and its quite simple to have the fuel manifold return go straight to the tank. I still think, in addition it would be better to have a tank return from the surge tank as well, as in your diagram. The ebay seller I bought this from will put whatever size unions you require and would also omit a union for your set up free of charge
Last edited by nickincrete; 02-08-2015 at 02:32 AM.
Installing my own EFI system (Megasquirt) and know I need to upgrade the fuel system. I like the idea of a swirl pot for both the simplicity (not messing w/ the tank too much) and the added safety for cornering. While I am not building a race car I do plan to go to a few track days.
Love this thread but wanted to surface a few of my remaining questions. (1970 Opel GT (manual trans) w/ 2.2L EFI Engine running megasquirt)
1.Where and how are people mounting everything? I want this to be tucked up for safety and looks. While I am interested in everything I am particularly interested in the location of the surge tank.
2.What size fuel lines are people running?
3.What type of fuel lines are people running (ex. solid , braided PTFE, a mix?) ?
"Autoholism is an incurable addiction medicated daily with car porn." ~Me
"the sickest of the sick — a car guy who is collecting parts for the restoration of a car he doesn’t even own yet." ~Anonymous
This is how I did it.
'71 Opel Kadett 4 Door 36D (2.0 L w/ EFI & Auto) - "Mary Ann"
'74 Opel Manta - "Barbara"
'05 Pontiac GTO
In the past owned:
'06 Pontiac GTO
2 Bitters (#491/#439)
'73 Commodore GS
ATLAS ( 74 Manta w/ 2.8L LK5 )
'73 Blue Max Manta Luxus
& at least 20 other Opels
im putting mine on the back of the tyre shelf above the fuel tank.
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