Rochester 2 Barrel Carburetor Accelerator Pump 2.590 x 21/32" - AP427

This is a hard to find accelerator pump. It fits 55 to 58 GM Rochester 2bbl carbs found on most V8 cars, including factory Tri-Power. The pump provided in most rebuild kits are WRONG, they are the 3/4" pump and will fit too tight in the pump bore of these carb. This pump is the correct size (21/32") and fits perfect.

The pump that came with the carb did not have the internal pump cup spring. This replace did and made a huge difference in my accelleration.

5 STARS TO MIKE'S CARBUERATOR PARTS ALWAYS A GREAT EXPERIENCE

Thanks Mike for prompt delivery of this part. It came just in time to get my boat going before long weekend. It fit and worked perfectly. Peter H.

Rebuilding my old 2 Jet for the third time in ten years. This is the first time using the correct accelerator pump assembly, all others were kit components. I always had a stumble under slight acceleration, no more, now it’s fine all around. Thanks Mike for the great rebuild video and the “sudden service” getting the part to me !! I would recommend Mike’s to everyone.

Hello Mike, Unfortunately this pump did not work out for me. I have an early Rochester 2CG on my 1955 Chevy. After doing more research I found that the early Rochester's take a different accelerator pump. The fuel flows into the pump well through the accelerator pump it self, not a channel underneath. Therefore I needed a pump which allowed the fuel to flow through and had a check ball inside. I was able to get one from a supplier on the east coast. Possible you could do an update on you YouTube videos to make mention of these differences as I find there are many who suffered from the same problem that I did. Thanks

Thank you for the follow up. The part was exactly what I was looking for because it came with a garter spring already installed. I had purchased two others elsewhere that did not have the garter spring and they failed almost immediately. So far it’s working perfectly.

Received product as advertised and it was what I needed

customer service and turn around are top notch

As described, good products. Will be ordering again!