NOS LT-1 Fuel Pump

[Kevin G.]

Re: NOS LT-1 Fuel Pump

Kevin,
That appears to be a 1989 box and likely a 1989 fuel pump. Nice useable NOS pump but likely has some differences in the casting, stampings and external detail from a 1972 pump.

Hit the nail on the head! Minor casting, stampings and external detail differences!

Does this pump have the "AC" logo on the sides of the casting?

Yes, see side by side comparison pictures
Side by side right (original/NOS)

Side by side left Notice stamping numbers on lower flange -original vs. upper flange -NOS

Right side original

Right side NOS

Stamping numbers original

Stamping numbers NOS

[Kevin G.]

Re: NOS LT-1 Fuel Pump

Clock on inside top flap of box: 10/89 = Oct 1989

Top of Box Code: 0002J9 = 2nd week, October, 1989

Flange Code: 282F = 282nd day (non leap year) = October 9th

Therefore, the character "F" would represent "October" in 1989.

Still have some questions as far as the code, compared to my original (build date of 5/10/72) vs. the NOS and the example above?

One of the more visible differences is the angle of the fuel inlet fitting. We detail that difference in the TIM&JG.

It does appear that the fittings are angled the same on both.

[Terry M.]

Re: NOS LT-1 Fuel Pump

It does appear that the fittings are angled the same on both.

Both of yours are 40956.

Now compare a 40956 to a pump stamped 40709 -- THAT is where you will find the inlet angle difference. Original 1970 and I think some 1971 LT1 pumps are stamped 40709.

[Dave S.]

Re: NOS LT-1 Fuel Pump

Both of yours are 40956.

Now compare a 40956 to a pump stamped 40709 -- THAT is where you will find the inlet angle difference. Original 1970 and I think some 1971 LT1 pumps are stamped 40709.

My 70 and 71 original fuel pumps are both stamped 709. I always thought 72's were as well.

[Terry M.]

Re: NOS LT-1 Fuel Pump

My 70 and 71 original fuel pumps are both stamped 709. I always thought 72's were as well.

And I always thought later 1971 and all 1972 were 40956. I haven't looked it up yet, but one of those pumps has the inlet pointing to the right rear tire and one to the left rear. The later design pump used a formed "S" shaped hose between the pipe and fuel line. The 40709 used, at least in 1970, a straight rubber hose that was bent to accommodate the fuel pipe and pump inlet. If not properly installed this straight hose could kink causing fuel starvation. The pre-formed S-shaped hose and relocation of the fuel pump inlet mitigated that issue.