of even small debris. Thus the filter sock on the pickup. once through the pump there is only the very small micron filter in the injector. So a filter after the pump is a must, and it needs a slightly smaller micron rating than the screen in the injector.

 

Gascolators generally have course screens in the top, and are of no value in protecting injected systems. OK for carburetted systems.

 

The pumps should be mounted in the tanks or close to and below the tanks where possible.

 

Pushing fuel under pressure is preferred to trying to suck it uphill from a tank. On a hot day,

and, or, with a length of fuel line close to a heat source, you will boil the fuel in the line, followed by a quiet period of glider practice.

 

Notice that modern cars are nearly immune to vapor lock (boiling fuel). Because the pump is in the bottom of the cool fuel in the tank, pushing the fuel.

 

Auto fuel boils more readily than aircraft fuel. So the shortest suction side run possible is best. Also, for any particular heat load, higher altitude means less pressure on the fuel surface in the tank, and boiling may occur. 

 

 

The race car uses a disposable filter from the parts store (inline can with push on ends) for about $2.00 each. These on the suction side of two sliding vane pumps mounted even with the fuel cell bottom. All of the pressurized fuel goes through a 16 micron filter then to the pressure regulator and the carb. The regulator is right beside the carb, so the highest pressure fuel is maintained to as close to the carb as is possible.

 

Carbs and sliding vane pumps are tolerant of larger debris than are roller style high pressure pumps. 

 

 

Lynn E. Hanover