Meanwhile, the outlet side of the pump has an optional bypass assembly along with wire connections (the wiring is dead simple: red-plus, black-negative). More on the by-pass in the next photo.

Our engine combination is old school carbureted. It needs a bypass. The bypass we're using is a spring-type arrangement (shown here "blown apart" - it resembles a giant carburetor needle and seat assembly). It is not physically adjustable, but you can change the spring to change the specific pressure at which the pump returns fuel to the tank. MagnaFuel can supply you with various springs for this combination, although they'll likely nail down the right spring with your order.

A fuel pressure regulator is an essential piece of the fuel delivery puzzle (that's no secret). As pointed out in the text, when selecting a regulator, you first have to choose if your car is carbureted or fuel injected. And there's also a special series of regulators for Corvettes with blowers or turbos (they're boost referenced). For certain EFI applications, there are some companies who build fixed EFI regulators, but for a modified Corvette application, an adjustable regulator is absolutely necessary. Because of the design, this particular adjustable regulator doesn't pressure creep (this is something that's critical in any engine--fuel injected or carbureted). Just like the pump, the regulator body is machined from 6061-T6 aircraft-grade aluminum alloy. Fuel pressure is set using the adjusting screw/jam nut system found on the topside.

Once the application is determined (EFI or carbureted), you then have to figure out how many ports the regulator will require. The 572 we're building is set up with a single four barrel, hence the two port arrangement. If you look closely, you'll see the serviceable, stainless steel cartridge mentioned in the text.

Also note the port for fuel pressure gauge. MagnaFuel recommends installing a pressure gauge right on the regulator for adjustment purposes then they advise you should remove it (most of the little fuel pressure gauges out there eventually leak).

For a serious street driven Corvette application, it's a very good idea to use two filters - a pre-filter mounted between the fuel tank and the pump followed by an after-filter, mounted between the fuel pump and the fuel regulator. Note that these in-line filters are engineered so that the fuel flows from the outside of the element to the inside. The filter bodies (also built from 6061-T6 aircraft-grade aluminum) are marked with the direction of flow. They're also color coded: Blue end caps on the filter signifies a 74 micron filter, black end caps are used for a 25 micron filter.

SOURCE
MagnaFuel Inc.
Colorado Springs
CO
www.magnafuel.com