Newly designed fully assembled, 21/32" Rochester pump assembly to withstand todays fuel with alcohol / ethanol. Crimped on metal retainer prevents the shaft from pulling out and highest quality pump cup that stands up to todays new fuels. Complete high performance accelerator pump plunger assembly with heavy duty alcohol resistant garter spring cup.
Note: Not all blue accelerator pump cups on the market are resistant to todays new fuels, dont be mislead by the color, demand the best!
WHY IS THIS THE BEST PUMP FOR QUADRAJET CARBURETORS? Click here to read an artical on Rochester Quadrajet Accelerator Pumps
Rochester Quadrajet carburetors
Rochester Dualjet carburetors
This Rochester pump assembly has a lower spring retainer height, which allows for increased pump travel for greater total fuel volume delivery. Also includes a new plunger return spring.
Works great in many early Quadrajet carburetors.
Ethanol resistant accelerator pump plunger
Ethanol resistant garter spring style cup
Duration spring retainer
Over all length (OAL): 2.435"
Pump Bore/Cup Diameter: 21/32"
Stem Length 1.00" (length above from spring retainer to stem tip)
The following carburetor numbers originally used this length pump assembly:
Edelbrock 1901, 1902, 1903, 1904, 1905, 1906, 1910
Rochester 17057230, 17057290, 17057533, 17059280, 17059283, 17059285, 17059286, 17059287, 17059288, 17059289, 17059290, 17059291, 17059292, 17059293, 17059294, 17059295, 17059296, 17059298, 17080560, 17080561, 17080562, 17080563, 17080564, 17080565, 17082403, 17083506, 17083508, 17083515, 17083522, 17084001, 17084507, 17084509, 17084516, 17085013, 17086069, 17086115, 17086116, 17086117, 17089112, 1347-6492A1, 1347-7361A1, 1347-7362A1, 1347-7363A1, 1347-7364A1, 1347-7365A1, 1347-7366A1, 1347-7498A2, 1347-7498A7, 1347-814623A2, 1347 8288A1 , 1347-8289A1, 1347-8290A1, 1347-8291A3, 1347-8292A4, 1347-8296A4, 1347-8588A1, 1347-9142A2, 1347-9415T, 1347-9661A3, 1347-9662A4, 1347-9863A3, 3300-8886A2, 3304-9354A2, 826359-2, 826415-2, 826442-6, 835556-2, 841047-4, 841313-0
May be used in other carburetor numbers to increase pump volume. If pump assembly length is too short, there will be no pump shot during initial throttle opening.
Instructions when replacing Rochester accelerator pumps:
It is very important that the accelerator pump bore is completely smooth. Today's fuels with ethanol have less lubrication and demand super smooth pump bore surfaces. Polish pump bore with crocus cloth as required. Rough pump bore surfaces will cause pump cup to stick to bore and tear or dislodge from plunger assembly.
Do not allow carburetor cleaner come in contact with pump assembly.
Coat outer edges of pump cup with a light coating of grease, if pump bore is not submerged in fuel.
Long term vehicle storage:
If vehicle is dormant and fuel bowl is allowed to go dry, pump cup has a much higher chance of sticking to pump bore. If bowl has run dry, fill fuel bowl with fuel before pumping accelerator pump assembly.
Additional recommended items:
Replacing the accelerator pump requires the removal of the air horn, it's always a good idea to have an extra set of air horn gaskets on hand to replace a ripped or worn gasket.
Replacement accelerator pump cup: Item #1010