Steve Baur
Former Editor, Modified Mustangs & Fords
October 12, 2006
Aeromotive's Fuel Pump Speed Controller reduces voltage and subsequently pump speed during low throttle situations. While the pump will be fully capable of fulfilling all of your engine's needs at normal speed, the controller will bump it down a few notches when you're not flexing your fuel injectors pulse widths.

Insufficient wiring of the fuel pump can cut performance by as much as 30-50 percent. To ensure maximum flow under boost reference conditions, use 10-gauge or heavier wire for the pump power and ground, a 30-40 amp relay, a 25 amp circuit breaker (blade fuses and fuse holders are not recommended), and pull the main power wire to the relay directly from the alternator charging stud.

If you're considering a switch from gasoline to methanol or ethanol, you won't be able to support the same horsepower with the same components. In fact, figure on cutting horsepower in half. Gasoline has much more heat per pound then alcohol-based fuels. The stoichiometric air/fuel ratio for gasoline is 14.7:1, compared to 6.4:1 for methanol and 9:1 for ethanol 9:1. Bottom line, it takes about twice as much methanol as gas to make the same horsepower.

"If you really want to know what your fuel system pressure is, don't use liquid-filled pressure gauges," says Clow. They report differently than nonfilled gauges, as variations in operating temperature change the pressure in the case, affecting the reading on the gauge." The hotter the gauge, the lower the reading, but fuel pressure in the rail hasn't changed one bit. A quick fix is to pull the plug in the gauge case and drain the liquid, or buy an air-filled gauge.