Fuel pump date code? David Liukkonen

[Gerard F.]

Re: Fuel pump date code? David Liukkonen

Chris,

The June 1966 ("FF") fuel pump date matches up very well with your early 1967 with #183 V.I.N. (August 1966). The 40433 pump was used on early 1967's and the 40503 pump was used on late 1967's. Your 40433 pump is definitely original since the 40433 pump was discontinued sometime in the middle of 1967 production.

I recently found a "6942 LE" (where "LE" = Dec. 1965) fuel pump in my garage attic that I bought at a junk yard in Wilton, NH on 4/11/89 from an early 1966 Chevrolet w/283 engine stamped "T1222GA" (Dec. 22, 1965).

Dave

Dave,

Not sure that the 40503 was used on late 67's, at least not on my late 67 (June 29, 1967 VIN22049) S/B. The fuel pump which came with mine is an FG40433 (June 67). Means to me they were still being produce in June 67 near the end of production.

Always thought that the 40503 was a service replacement fuel pump.

[David L.]

Re: Fuel pump date code? David Liukkonen

Dale

Dale,

I assume your AC fuel pump is stamped "140Y 40659". According to my research the AC 40659 pump is GM # 6417338. According to Chevrolet Parts History GM # 6417338 was discontinued in June 1971 and replaced with GM # 6470106 (AC 40718). I would normally say your fuel is dated the 140th day of 1986 ("140Y") but it doe not seem to make much sense. In the picture your fuel pump does NOT look 42 years old. Is it the original fuel pump? Was the pump rebuild or replated? Did AC re-issue the 40659 fuel pump? Is it a reproduction? Is this some like of trick question? I have no other logical answers.

Dave

[David L.]

Re: Fuel pump date code? David Liukkonen

Dave,

Not sure that the 40503 was used on late 67's, at least not on my late 67 (June 29, 1967 VIN22049) S/B. The fuel pump which came with mine is an FG40433 (June 67). Means to me they were still being produce in June 67 near the end of production.

Always thought that the 40503 was a service replacement fuel pump.

Jerry,

You are probably right. My 1967 Chevrolet Parts Catalog (April 1967) lists GM # 6416712 as the part number for the 1967 Chev. & Corvette (327) fuel pump which is AC # 40503.
According to Chevrolet Parts History GM part numbers 6416497, 6416508, and 6416509 (AC #40433) were all discontinued and replaced with GM # 6416712 in Feb. 1967.
The assembly line probably had enough 40433 (GM # 6416509) fuel pumps on hand for the entire 1967 production year. Chevrolet used up all the 40433 pumps until they were gone.
Thanks for that information.

Dave

[Dale C.]

Re: Fuel pump date code? David Liukkonen

Dave

Don't know very much about the cars history. I got it from a collector in Ky. The car sat in storage for many years and had only 52000 origional miles. Most of the parts are in good shape and appear to be correct for that year, had some replacement parts though. My guess, it could be a a refurb, maybe, as I say other parts look good to be that old too. As you know being a 68 there were a bunch of things that were unique to that the car and it's been true concerning those oddities. Just don't know, but I doubt that there is much market for that being a reproduced pump and it was a correct # for production. I guess I would tend to trust it is correct. The other wear parts that I have examined kind of imply little use or wear. I don't know if it's reproduced. It was on the car when I got it. I just went to Corvette Cent and there it is a repo., but I didn't get this one there and I don't know this ones history. Just looked at pictures of repo and compared and mine is different from CC's..

Dale

[Ronald L.]

Re: Fuel pump date code? David Liukkonen

David,

Of the above letter codes, you have examples of all these? Or just a few?

I have seen E F and H in the second digit.

Any idea of what the Diamond and Heart shape are all about???

[John H.]

Re: Fuel pump date code? David Liukkonen

Dave,

Not sure that the 40503 was used on late 67's, at least not on my late 67 (June 29, 1967 VIN22049) S/B. The fuel pump which came with mine is an FG40433 (June 67). Means to me they were still being produce in June 67 near the end of production.

Always thought that the 40503 was a service replacement fuel pump.

Jerry -

I think you're right - the failed pump I just took off my June-built '67 last month has all the typical visual characteristics we look for on an original pump, but the flange is stamped "143H40503".

[Gerard F.]

Re: Fuel pump date code? David Liukkonen

Jerry -

I think you're right - the failed pump I just took off my June-built '67 last month has all the typical visual characteristics we look for on an original pump, but the flange is stamped "143H40503".

John,

If David's date coding theory is correct (which I think it is), the FG would mean it was manufactured in June 67. Perhaps the 40433 was discontinued for service applications in April 67 by the 67 parts book, but it seems that they were still making them in June 67 for the factory applications.

Here's my coffee table piece, original to my car (but slightly refurbed):

[Chris E.]

Re: Fuel pump date code? David Liukkonen

Thanks David, that confirmed what I suspected, that the fuel pump was original to the car.

[John H.]

Re: Fuel pump date code? David Liukkonen

Here's my coffee table piece, original to my car (but slightly refurbed):

Couple of photos below of the 40503 I removed; fittings aren't configured like the 40433.

[David L.]

Re: Fuel pump date code? David Liukkonen

Couple of photos below of the 40503 I removed; fittings aren't configured like the 40433.

John,
I assume the 2 pictures of your 40503 replacement pump is the one stamped "143H40503" where I believe the "143H" = 143rd day of 1968.
Dave

[Gerard F.]

Re: Fuel pump date code? David Liukkonen

Couple of photos below of the 40503 I removed; fittings aren't configured like the 40433.

The base on my 40433 above (as well as the internal parts) are from a replacement 40503. However the inlet fitting from the original 40433 was brazed on in place of the inlet on the 40503 before being recrimped to the body.

The guy did a nice job on it and got the orientation just right.

I hauled this fuel pump around on the last Road Tour as a spare, but it will be off the coffee table and on the car this summer when I put the restored 3810 763 on it.

[John H.]

Re: Fuel pump date code? David Liukkonen

John,
I assume the 2 pictures of your 40503 replacement pump is the one stamped "143H40503" where I believe the "143H" = 143rd day of 1968.
Dave

Dave -

Yes, that's correct.

[Ronald L.]

Re: Fuel pump date code? David Liukkonen

David, a 40148 for 66 350 HP with no date code, AC original, were these supposed to have dates?

[David L.]

Re: Fuel pump date code? David Liukkonen

David, a 40148 for 66 350 HP with no date code, AC original, were these supposed to have dates?

I believe that the 40148 fuel pump was used on the 65 Chevelle w/327 as possibly a replacement but I will to do some resarch in my library to verify this. The 66 350 HP used a 40083 (GM #6415325) pump.

[Ronald L.]

Re: Fuel pump date code? David Liukkonen

They said it would fit 65-67 and other applications; surprised an AC part out of the box did not have any code in front of the number.