Help identifying leak culprit

[Patrick H.]

Re: Help identifying leak culprit

Even if the Doc had it, he won't sell it to you.
Other vendors carry this hose too.

FYI my fuel pump showed a seepage like this right before it failed last week.

[Fred H.]

Re: Help identifying leak culprit

Confirming a 3994298 hose is correct for our 72 LT1? Our existing the straight fuel line.

[Leif A.]

Re: Help identifying leak culprit

Even if the Doc had it, he won't sell it to you.
Other vendors carry this hose too.

FYI my fuel pump showed a seepage like this right before it failed last week.

Patrick,
How can you make such a blanket statement? NCRS is almost 70,000 members strong and a miniscule percentage have a vendetta against Doc Rebuild so therefore he has chosen not to sell to those particular members. Why stigmatize a man and his business just because a few don't see eye to eye with him. I, for one of many, have never had anything but good relations with him and his business. He has quality products, mostly made in the USA and, also, has many products that no other vendor has. I think it's time we "live and let live".
To the OP, Michael if you decide this part will work for you I would recommend going to the Doc's website and ordering online...bet you get your fuel line.

[Patrick H.]

Re: Help identifying leak culprit

Patrick,
How can you make such a blanket statement? NCRS is almost 70,000 members strong and a miniscule percentage have a vendetta against Doc Rebuild so therefore he has chosen not to sell to those particular members. Why stigmatize a man and his business just because a few don't see eye to eye with him. I, for one of many, have never had anything but good relations with him and his business. He has quality products, mostly made in the USA and, also, has many products that no other vendor has. I think it's time we "live and let live".
To the OP, Michael if you decide this part will work for you I would recommend going to the Doc's website and ordering online...bet you get your fuel line.

Leif,

I was, I thought, a personal friend of his for almost 30 years. Emails, visits at Carlisle, discussions regarding his parts, and many other interactions. I thought as well that we had excellent relations over the years. I had even told him more than once that if he ever truly wishes to sell the business and retire that I'd be interested.
Despite all of that even my order was cancelled in the midst of this, just days after we conversed by email regarding some parts. The only "sin" I committed was being an NCRS member.

In addition, other NCRS members who were not in the short list of people that he didn't like had orders cancelled.

And that is why I can make the statement.
I'm not stigmatizing him at all, but if he won't even sell to friends I don't know who he would sell to.
I'd love to continue to buy from him but apparently that's not possible any more.

Oh, there are currently just over 12000 current and active NCRS members even though we've had almost 70000 different members over the years.

[Mick D.]

Re: Help identifying leak culprit

Thanks for the note Patrick. I hope mine isn't ready to fail. I am interested in stickers, I will DM you.

Even if the Doc had it, he won't sell it to you.
Other vendors carry this hose too.

FYI my fuel pump showed a seepage like this right before it failed last week.

[Arland D.]

Re: Help identifying leak culprit

Leif,

Patrick is correct and there are many NCRS members who would like to 'live and let live' but that is not the source of the disconnect. Please read the sticky posted above regarding Doc Rebuild not accepting orders from NCRS members. You can read for yourself his words on his website in his email to me. Perhaps after you read his words, you might want to have the 'live and let live' chat with him.

[Mick D.]

Re: Help identifying leak culprit

Hi Joe,

I believe you are correct. Most sites that sell this hose mention it is for "long fuel pump"

The LT-1 pump seems like a short one.

I've had no luck identifying a specific hose from the AIM, but as you said, maybe this one is fine, or can be cut to work.

Leif-------


I think this hose is for the 1970-79 L-48/L-82 which use a different fuel pump than LT-1. However, it might work for LT-1.

[Leif A.]

Re: Help identifying leak culprit

Patrick and Arland,
Thank you both for your thoughtful responses...I get it. I have sent an email to Geoff regarding who can and who can't buy parts from his store. I'll update you all with his response. Whatever the response is, it is truly unfortunate that this situation has sunk to this level. Geoff (as you all know) has great parts and the number of suppliers is dwindling not expanding.

[Mick D.]

Re: Help identifying leak culprit

It looks like it may be S-shaped, hard to tell. This is the one that is on my 71 LT-1. It looks like it snakes behind the fuel pump and then on to the rail. It may be that the one that is on it is wrong, which is why its leaking in the first place (although it looks very old also).

IMG_7631.jpg

[Leif A.]

Re: Help identifying leak culprit

Patrick, Arland, etal,
I don't want to scratch a scab off any wounds, so after I post this we can drop it. I said, earlier, that I had dropped Geoff an email and would report back. Below is a copy of my email to Geoff and only the first line (pertinent to this discussion) of his reply.

Good afternoon, Geoff

Hope all is well with you and your family. Kindly answer a simple question for me (even though I believe I know the answer). Is every member of the NCRS banned from buying parts from you? I cry “bull****” on this but I keep getting shot down by some members on the TDB. I know I have sent several members your way since the “infamous” email went out regarding sales to NCRS members and they all have reported back to me that their order was accepted and they received their parts in good order. I would like to post a definitive answer on the TDB to this question as it has reared it’s ugly head once again.
Thank you for taking the time to read my email and respond.

Regards,
Leif

Geoff's response (again, only the first line of his email)

"You are right. I have shipped many orders to those that answered truthfully regarding their ncrs membership. Those that were dishonest were cancelled. There are some I would never ship to or ship to again...

[Joe L.]

Re: Help identifying leak culprit

Justin
Just as an FYI: My early build 1970 LT1 came with a straight hose. When it wouldn't rev over 5000 (that would have been a PV fail) I tracked the problem to a kinked fuel hose. I was able to get the S-shaped molded hose from the parts department. That cured the fuel delivery problem.

Terry------

Well, apparently the 1970-72 LT-1 did use the same hose as L-48 and L-46 of the same year even though the configurations of the LT-1 and L-48/L-46 fuel pumps were completely different.

The fuel supply hoses were as follows:

1970-------GM #3933330

1971-72---GM #3994298

1973-81---GM #6271610

However, I have researched this exhaustively and I cannot find that ANY of the above hoses were ever available from GM in SERVICE. I cannot find that they ever existed in the GM SERVICE parts system and I cannot find that they were ever cataloged in SERVICE for a Corvette. So, I do not understand how you were able to obtain one in SERVICE from GM. Perhaps, they had a molded hose for some other application and of now unknown part number that they supplied to you.

As I mentioned previously, I used the AC 40709 fuel pump as the SERVICE fuel pump for my 1969 small block and this is the same pump used for PRODUCTION and SERVICE for 1970-71 LT-1. I never had any problem whatsoever using a non-molded fuel hose. However, I offer this caveat: I always used THICK WALL fuel hose, and not the thinner wall type. With the thick wall fuel hose the reinforcing cord does not "show through" on the exterior of the hose. With the thin wall type, the reinforcing cord does "show through". If the latter type is used, it will kink every time.

Interesting side note on the 1968-69 small block fuel pump: the original pump for these applications was the AC 40658, aka GM #6417337 (GM parts system SERVICE part number). This pump was discontinued through the GM parts system in August, 1971 and replaced by the AC 40709, aka GM #6470110 (SERVICE part number). However, the AC 40658 continued to be available through the Delco parts system for MANY years. I discovered that fact LONG after I had replaced my fuel pump a few times. So, I bought several of them after I no longer needed them [none for sale].

[Keith W.]

Re: Help identifying leak culprit

Mick------


I don't think 1971with LT-1 used a molded hose. But, if it did, I do not know of any source for such a hose. In addition, it's very easy to use a section of non-molded, heavy wall fuel hose. Route it properly with no sharp bends and it will not kink.

1971 with LT-1 has essentially the same fuel pump and hose configuration as 1968-69 small block. I can tell you for certain that I replaced the fuel hose several times on my original 1969 small block using non-molded hose and never had any problem. By the way, while 1968-69 small block originally used the AC 40658 fuel pump, that was replaced for SERVICE in the early 70's with the AC 40709, the exact same pump as used for 1971 LT-1. I used the 40709 on my small block from the very first replacement.

Joe, do you think this hose from corvette central would work? My original LT-1 fuel pump is being rebuilt at the moment. When I removed the pump I noticed the hose from the supply line to pump was deteriorated and needs replacing.

https://www.corvettecentral.com/sear...+line&count=42

[Joe L.]

Re: Help identifying leak culprit

Joe, do you think this hose from corvette central would work? My original LT-1 fuel pump is being rebuilt at the moment. When I removed the pump I noticed the hose from the supply line to pump was deteriorated and needs replacing.

https://www.corvettecentral.com/sear...+line&count=42

I have ordered a hose from a few other sources which are the “S” type but they are too short. The original hose that I took off clearly is not of the “S” type.
Thanks

Keith------

The link just takes me to a plethora of fuel system related parts so I do not know which fuel hose among them you are referring to. As I stated previously, a length of high quality, heavy wall fuel hose will work just fine. Purchase a length and, test fit it, and cut it to the necessary length.

If your hoses are original to the car, they don't need to be replaced now; they needed to be replaced at least 25 years ago!

[Fred H.]

Re: Help identifying leak culprit

My 72 assemby manual show the "S" curved hose @ the inlet side of the fuel pump?

manual 1.jpg

[Terry M.]

Re: Help identifying leak culprit

Terry------

Well, apparently the 1970-72 LT-1 did use the same hose as L-48 and L-46 of the same year even though the configurations of the LT-1 and L-48/L-46 fuel pumps were completely different.

The fuel supply hoses were as follows:

1970-------GM #3933330

1971-72---GM #3994298

1973-81---GM #6271610

However, I have researched this exhaustively and I cannot find that ANY of the above hoses were ever available from GM in SERVICE. I cannot find that they ever existed in the GM SERVICE parts system and I cannot find that they were ever cataloged in SERVICE for a Corvette. So, I do not understand how you were able to obtain one in SERVICE from GM. Perhaps, they had a molded hose for some other application and of now unknown part number that they supplied to you.

As I mentioned previously, I used the AC 40709 fuel pump as the SERVICE fuel pump for my 1969 small block and this is the same pump used for PRODUCTION and SERVICE for 1970-71 LT-1. I never had any problem whatsoever using a non-molded fuel hose. However, I offer this caveat: I always used THICK WALL fuel hose, and not the thinner wall type. With the thick wall fuel hose the reinforcing cord does not "show through" on the exterior of the hose. With the thin wall type, the reinforcing cord does "show through". If the latter type is used, it will kink every time.

Interesting side note on the 1968-69 small block fuel pump: the original pump for these applications was the AC 40658, aka GM #6417337 (GM parts system SERVICE part number). This pump was discontinued through the GM parts system in August, 1971 and replaced by the AC 40709, aka GM #6470110 (SERVICE part number). However, the AC 40658 continued to be available through the Delco parts system for MANY years. I discovered that fact LONG after I had replaced my fuel pump a few times. So, I bought several of them after I no longer needed them [none for sale].

Joe
I doubt I will be able to find a part number for the "S" shaped hose I got when my 1970 was a year or two old. (Although Fred provides a clue below.) The friend I developed in the parts department was a wizard at finding items, and those were the days with voluminous parts books and no computers. This guy's memory was just remarkable, like yours.