Hilborn Technical Support - Electronic - Fuel Injector Manifolds
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Noisy fuel pump

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This concern is a direct result of poor fuel supply to the inlet side of the pump. Due to this concern, intermittent drivability problems could possibly result. Causes are as follows:

• Does the tank/cell have a 3/8 vent minimum?

• Have you substituted the originally supplied fuel filters?

• Is the fuel pump inlet filter correct for the application and is it a minimum of 40 microns? Are the fuel supply fittings full flow? Do not use brass or machined aluminum fittings.

• Does the return line dump into the highest and most forward part of the tank/cell, positioning it as far as possible from the outlet?

• Except for the model 600A, fuel pumps should not suck UP more than 12 inches.

• Does the tank/cell have enough fuel?