Hilborn Technical Support - Mechanical - Fuel Pumps
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Which fuel pump should I run?

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The first digit of the serial number stamped (not cast) into HILBORN pump castings indicates the pump volume. The following list is a guide to help you select the correct pump size for your fuel requirements:

PG150 series
size #00 - Extremely small engines such as motocycles.
size #0 - Medium size engines, 200" to 360", running gas or methanol. Use with carburetors or small turbo engines.
size #S0 - (Super-0) Medium size engines, 360" to 410", running gas, methanol, or small amounts of nitro.
size #1/2- Same as #S0, just a higher pump volume.
size #1 - Large engines on gas and small amounts of nitro. Also for blown engines on gas, methanol, and small amounts of nitro.

PG175 series
size #2 - Large engines with high percentages of nitro and blown engines on methanol.
size #4 - Very large engines, high percentages of nitro, and blown engines on nitro.

PG250 series
size #5 - Largest pump volume. Very large engines on nitro. Also for turbo or supercharged engines.