Fuel System
From M-Tech Automotive
When converting from a carburated system to fuel injection, the injection system requires a constant regulated high pressure fuel supply (around 3.5 Bar/50-60psi) at all times. This can be achieved using an external swirl pot, or indeed all EFI fuel tanks will already have something similar built in, requiring only one 'in-tank' high pressure fuel pump.
Here you can see the fitment of swirl pot and high-pressure pump to Martin's Pilgrim when we carried out his Zetec transplant.
In vehicles which were previosuly carburated, you will generally need to fit a fuel swirl pot, which is in essence a smaller tank which is fed by a low pressure lift pump to keep a decent head of fuel above the high-pressure pump, ensuring that during hard cornering or heavy braking, fuel supply is contsant. If this were not the case, the engine may run lean, which could cause severe damage, usually resulting in engine failure.
The following diagram outlines your basic fuel injection delivery system utilising an external swirl pot. Please click it for a larger picture if required. Note that under hard cornering, the fuel in the main tank may surge away from the low-pressure pickup pipe, but the shape of the swirl pot almost guarantess that the high pressure pump will always have fuel available, if only to cover these short 'starvation' periods. We can supply you a complete Swirl-Pot Conversion Kit if this is something you require.
