'71 Z28 LT1 fuel pump replacement?

[Eric winkel]

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

 

[Chevyforever]

Yes.

 

[Eric winkel]

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]

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:

Pure-gas.org - ethanol-free gasoline in the U.S. and Canada

Pure-gas.org is the definitive web site listing stations that sell pure gasoline in the U.S. and Canada.

www.pure-gas.org

 

[Twisted_Metal]

Did your original pump haves three ports? (One for a return line.)

 

[Eric winkel]

Original only had two.

 

[Eric winkel]

Pic of pump

 

[70lt1z28]

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]

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]

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.