The car needs a fuel pump upgrade. The V4 original will not do with dual Webers… 😀
You could ofcourse just go to a store and buy a bigger and better fuel pump. But, as this is something of a budget build we decided to go with what we had. And we have a lot of Mitsubishi in-tank pumps… Used, but in good condition. So we went on to fit one of those in the regular V4 fuel tank.
I need to use a fuel pressure regulator to reduce the pressure of the Mitsubishi unit from 38 psi (2.6 bar) to around 4 psi suitable for the Weber 45s. I have this old Malpassi fuel pressure regulator that I hope will do the trick. But if it doesn’t a suitable regulator is not very expensive.
Here’s how we fitted the Mitsubishi pump:
The tank is filled to the brim with water before anything that might create sparks is done! Here a hole for the pump has been cut.
Making the fuel pump flange and cover plate.
Fitting the flange inside the tank. Threads were tapped to the flange.
Drilling out screw holes in the tank.
Removing some unwanted stuff inside the tank.
I made a very simple bucket for the pump of a used paint thinner can and some aluminium pieces. Hopefully the bucket keeps the pump from sucking air in hard cornering. If not – I’ll make a better bucket.
The fuel pump in the bucket – inside the tank.
The pump frame was welded to the cover plate. It’s a tight fit, but the pump and bucket can be removed in single unit and taken apart by opening two screws.
Cover plate (and pump) in place.
Fitting the fuel pump pressure and return lines, and electric line.
Fittings waiting to be brass soldered. This is how far we got to day.
