Fuel surge tank

Fuel surge tank, Catch tank

How do I install a fuel surge tank with internal fuel pumps?

BTR installed after fuel rail
Fuel pump in fuel tank -> Fuel pump in fuel catch tank -> Fuel filter -> Fuel rail / Carburetor -> Fuel pressure regulator -> Return to fuel catch tank -> Return to fuel tank.

BTR installed before fuel rail
Fuel pump in fuel tank -> Fuel pump in fuel catch tank -> Fuel pressure regulator (overflow in return to fuel catch tank -> return to fuel tank) -> Fuel rail / Carburetor.

How do I install a fuel surge tank with external fuel pumps?

BTR installed after fuel rail
Fuel pump in fuel tank -> Fuel catch tank -> External fuel pump -> Fuel filter -> Fuel rail / Carburetor -> Fuel pressure regulator -> Return to fuel catch tank -> Return to fuel tank

BTR installed before fuel rail
Fuel pump in fuel tank -> Fuel catch tank -> External fuel pump -> Fuel filter -> Fuel pressure regulator (overflow in return to fuel catch tank -> return to fuel tank) -> Fuel rail / Carburetor.

Installation of welded fuel catch tank
Note that a welded catch tank for fuel must not be mounted blankly in the chassis. This is due to chassis movements, which eventually cause the welded chat tank to burst with fuel leakage as a result.

Which fuel pump should I use as a pre-pump or feed pump?
You can opt for a pre-pump with a lower flow than the main pump. There are two reasons why this is a good choice:

Firstly, the pre-pump doesn't work with back pressure, so it has a better flow rate.

Secondly, fuel from the engine is returned to the catch tank, which is fed with fuel from two sources.

However, if you decide to use a main pump as a feed pump, it will work just fine.