Rochester 4G Accelerator Pump (Garter Spring) Assembly, 3/4" E
Our Part # 1007EG

Brand New GARTER SPRING Style Pump Assembly for Rochester Four-Jet carburetors!

More durable and reliable than original Double Lip style pump.

3/4" Rochester 4G carburetor pump assembly is designed to withstand today's fuel with alcohol / ethanol. Comes with highest quality pump cup that stands up to today's new fuels.
 

Dimensions:
Pump cup/Bore diameter: 3/4"
Overall length (OAL): 3.022"
Stem Length 1.30" (length above from spring retainer to stem tip)
Cup Style: Garter Spring (ethanol resistant)

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.

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.

Replacement accelerator pump cup: Item #1011