How generic are Chevy 6 fuel pumps

[Brad in Wisconsin]

I've been struggling of late with a usable fuel-pump for my 33 1 1/2 ton Chevrolet truck. Just looking for a usable one. What years fit what? they made six's for 70 some years gotta be some cross over from other marques or make? Thanks

[Dave39MD]

AC type number 405 was used from 29-33. They are out there as well as aftermarket pumps that work. The early ones has a fragile top cover and starting in 32 they used an air dome on one of the valve covers. 

 

Dave

Edited April 17, 2021 by Dave39MD (see edit history)

[John348]

I will check tomorrow I think I have a rebuilt in the box leftover from when I had my 31

[BearsFan315]

the AC405 are out there, plenty of them. rebuilt a few myself. saw an NOS one on ebay yesterday. main issue as noted was the cap warping so it would not seal. but can sand/machine that flat if not too ad. think it was 31 or 32 they put on the vent on the top. also have to watch out for the lever arm wearing down and or the cam lobe that it rides on to work. 

 

Gary has a good selection of used parts and some NORS/NOS , Bob may be able to assist as well, from time to time he has one rebuilt for sale.

 

*Gary Wallace in Missouri
.....Website:Early Chevrolet Parts
.....Phone:(314) 293-1991
*Bob Marx in Wisconsin (Posts on here as marxparts)
.....Website:Marx Parts LLC: Antique and Vintage Car Parts
.....Phone:(715) 652-2405
.....email:bob@marxparts.com

 

if not let me know

 

few picts of the AC 405 that i rebuilt for my 1929

[Brad in Wisconsin]

Thanks all for help. seems top half is a lil more generic than bottom. The hole in crankcase changes . I got parts from Mr Marx and rebuilt what I had which is the type with no access door  to hook up to camshaft bell-crank  to the diaphragm shaft. Fun fun fun