Rochester 4G Carburetor Accelerator Pump AP316

Rochester 4G Carburetor Accelerator Pump AP316 – Premium Replacement for 4G, 4GC, and 4 Jet Carburetors

Restore your classic Rochester 4-barrel carburetor's performance with the Rochester 4G Accelerator Pump AP316. This U.S.-manufactured, ethanol-resistant pump is engineered for durability and optimal fuel delivery, ensuring smooth throttle response and eliminating hesitation during acceleration.

 Key Features:

• Precision Fit: Designed for Rochester 4G, 4GC, and 4 Jet carburetors.

• Durable Construction: Ethanol-resistant materials withstand modern fuel blends.

• Exact Specifications:

  • Overall Length: 3.176" (fully extended)

  • Cup Diameter: 21/32"

  • Stem Length: 2.618"

 Vehicle Compatibility:

Compatible with select Oldsmobile models:

• 1954–1956:

• 1958–1965:

 Installation Tips:

• Apply a few drops of oil to the pump cup before installation.

• Avoid soaking the pump in fuel or solvents.

• Polish the pump bore with crocus cloth prior to installation.

• Ensure the pump does not dry out during storage

 Customer Reviews:

Rated 5.0 out of 5 stars. Customers praise the AP316 for its perfect fit, quality construction, and noticeable improvement in engine performance.

Frequently Asked Questions – Rochester 4G Accelerator Pump AP316

1. What carburetors is the AP316 accelerator pump compatible with?
The AP316 is designed for Rochester 4G, 4GC, and 4 Jet carburetors. It fits various models used in Oldsmobile vehicles between 1954 and 1965. Always verify your carburetor model number before purchasing.

2. Is the AP316 accelerator pump ethanol compatible?
Yes, this accelerator pump is made with ethanol-resistant materials, making it safe to use with modern fuel blends such as E10 and E15.

3. What are the dimensions of the AP316 pump?

• Overall Length (fully extended): 3.176 inches

• Cup Diameter: 21/32 inch

• Stem Length: 2.618 inches

These specs match many Rochester 4G applications

4. Does this pump require any special preparation before installation?
Yes, to ensure proper performance:

• Lightly oil the pump cup before installation

• Do not soak in gasoline or harsh solvents

• Polish the pump bore with crocus cloth

• Store it lubricated and sealed to prevent drying

5. Is the AP316 made in the USA?
Yes, this is a U.S.-manufactured product, built to meet high quality standards for classic vehicle restoration and performance.

6. Does this pump fix hesitation or bogging during acceleration?
Yes, a worn or hardened accelerator pump is a common cause of throttle hesitation. Replacing it with the AP316 typically restores smooth throttle response and eliminates bogging during acceleration.

7. How quickly does the AP316 ship?
Orders placed before 12:00 PM PST Monday–Friday typically ship the same day. See shipping info for details.

8. Is this item in stock?
Availability is shown directly on the product page, just below the price. Most AP316 pumps are kept in stock and ready to ship.