'71 Z28 LT1 fuel pump replacement?

Eric winkel

Member
Mar 3, 2021
61
Didn't want car down for the rest of the season so grabbed an AC Delco fuel pump off of ebay, not sure what I bought as # on flange says 42080. Still have my original but too much downtime for a rebuild. Will this pump work with factory 780 holley carb? Thank you
 

Attachments

  • Screenshot_20220801-100620_eBay.jpg
    Screenshot_20220801-100620_eBay.jpg
    50 KB · Views: 50
  • Screenshot_20220731-213029_eBay.jpg
    Screenshot_20220731-213029_eBay.jpg
    41.6 KB · Views: 53
  • 20220731_192356.jpg
    20220731_192356.jpg
    136.3 KB · Views: 57

Eric winkel

Member
Mar 3, 2021
61
Is pump a service replacement, it's not a 40987 as nos box states correct? Figured it was better than something made in china.
 

70lt1z28

Veteran Member
Gold Member
Oct 3, 1999
5,036
Beavercreek, Ohio, USA
Is pump a service replacement, it's not a 40987 as nos box states correct? Figured it was better than something made in china.
Possibly. The diaphragm and rubber parts in an old NOS pump may not stand up well to the ethanol that is in most pump gas today. I say may not as I seem to find many conflicting opinions on this,just like most things on the internet. Maybe why your original pump gave up the ghost?
If you want to steer clear of ethanol, here is a good web site:

 

70lt1z28

Veteran Member
Gold Member
Oct 3, 1999
5,036
Beavercreek, Ohio, USA
Don't lose the original pump. It is dated the 153rd day of 1971 and can be rebuilt by Fred Ballard. Original 40726 pumps are hard to find. 40726 were Z28 only pumps.
 

Eric winkel

Member
Mar 3, 2021
61
After I install the nos pump from ebay I'll send original to Fred. Because of its age the NOS pump might not even work. Thanks
 

Gary S

Administrator
Lifetime Gold Member
Apr 14, 1999
24,719
Bismarck, North Dakota
The 40726 pump was also used on A body with 350 engines, and B body cars with 350 and 400 engines in 1970 so it shouldn't be that difficult to find.
 




Latest posts

Top