1964-1966 rubber fuel hose connection from hard line to 40083 fuel pump

[Gary B.]

I have a couple of questions about the rubber hose that connects the hard fuel line from the fuel tank (that terminates near the top of the frame on the passenger’s side of the engine compartment) to the fuel pump on a ‘64-‘66 with the 40083 fuel pump. This photo shows the tip of the hard line and the tip of the fitting on the fuel pump. The straight line distance between the two tips about 2.5”

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I don’t have the original rubber fuel hose, but I’m guessing the hose needs to be about 5” or 6” long in order to have 1.0” or 1.5” at each end to be clamped at each connection, and some extra length to make the smooth 90 degree turn downward after leaving the hard line to connect to the vertical directed fitting at the fuel pump. Does 5” or 6” sound about right?

Also, what is the best orientation to leave the ears of these spring clamps?

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When working on the rolling chassis, accessibility to not really an issue, but I think it’s going to be much harder once the body and chassis are back together. Has anyone replaced their ‘64-‘66 40083 fuel pump and/or the rubber hose on a fully assembled car who knows the best place to position the ears on those two spring clamps?


Gary

[Ed S.]

Re: 1964-1966 rubber fuel hose connection from hard line to 40083 fuel pump

Gary. I installed a 40083 on my 64 L76 when the care was completely assembled. I did have the alternator removed - that will give you some room to work from the top. As I recall, installing the hose you ask about is a bummer. I installed the hose on the rigid pump pipe first, including the correct square clamp. Then I installed the pump - with the 2 bolts very loose - a lot of play or movement of the pump I was able to slide the rubber hose off of the steel tube from the tank. Clamp orientation - the clamp on the pump, with the pump installed, the square ends are pointing towards the right front tire - straight out to the right. The top clamp - square ends pointing up - but turned to about the 1 o'clock position - about 15 degrees towards the block. Be sure to shoot some silicone lube into the hose ends - it will slide over the tubing real easy. Also the upper clamp - install it on the hose before you install the pump on the block - have the clamp about 2 inches back from the end of the hose - no further or you won't be able to get a grip on it to expand. The length of my hose - hard to measure on the car - but I would guestimate between 5 & 6 inches.

[Gary B.]

[Ed S.]

Re: 1964-1966 rubber fuel hose connection from hard line to 40083 fuel pump

It is a knuckle scraper either way - live and learn! The silicone makes a big difference - you can probably get the hose on the pump from the top with silicone - moving the clamp might be a real challenge.

[Gary B.]

[Ed S.]

Re: 1964-1966 rubber fuel hose connection from hard line to 40083 fuel pump

That stuff comes in real handy - I that tip from a thread on this forum. It really pays off when you are installing radiator hose clamps - the tower clamps. Put some silicone on the rubber all around - under - where the clamp will be - as you tighten the clamp - if you don't have the silicone lube on the rubber the clamp has a tendency to bite into the rubber and resists getting tighter as you turn the nut. With the lube there is very little friction between the hose and the clamp surface against it - the clamp snugs up real nice - reduces the risk of breaking that dated clamp.

[Jim L.]

Re: 1964-1966 rubber fuel hose connection from hard line to 40083 fuel pump

Something else which is good to know: Under pump vacuum, that section of hose can collapse which reduces/stops fuel flow to the pump and, subsequently, to the carburetor.

Mitigation is easy: Insert a coil spring inside that length of hose.... similar in concept to the coil spring we are all used to seeing in the lower radiator hose. Suitable springs can be found at any hardware store.

[Gary B.]

Re: 1964-1966 rubber fuel hose connection from hard line to 40083 fuel pump

Something else which is good to know: Under pump vacuum, that section of hose can collapse which reduces/stops fuel flow to the pump and, subsequently, to the carburetor.

Mitigation is easy: Insert a coil spring inside that length of hose.... similar in concept to the coil spring we are all used to seeing in the lower radiator hose. Suitable springs can be found at any hardware store.

Very interesting!

[Gary B.]

Re: 1964-1966 rubber fuel hose connection from hard line to 40083 fuel pump

Ed, Jim,

I almost followed your suggestions. First of all, the silicone lube worked perfectly. That technique is a keeper. In terms of the hose length, by holding the bent hose next to the tubes, and estimating length needed, I thought 5.25” would be good. But after cutting a piece to that length and test fitting it like the final install, it was clearly too long. I shortened it to 4.75”, which is what I used in the end. I could have shortened it to 4.5”. But either length will work. I have the top clamp with the ears near vertical, figuring any future access from above should be manageable. The bottom clamp, at the fuel pump connector, I have pointing toward the center of the right tire. That might be rotated forward from your description of pointing directly outboard. I chose the tire center direction because in the future it looks like I will have a straight shot up to the clamp ears from the gap directly below. Or maybe it can be done from above like this installation was. I hope that all these new parts will outlive me and I’ve never have to undo what I just did.

Jim, I’m hoping I don’t ever regret not sourcing a spring to keep the hose from collapsing at the 90 degree corner. I was just too anxious to get this project done today so I can move on to another task. Often to my detriment, I get impatient.

Thanks guys,

Gary

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The black line on the blue tape shows me where the supply line has the start of the expanded end. My clamp is about 3/16” upstream of the start of that end enlargement.

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[Jim L.]

Re: 1964-1966 rubber fuel hose connection from hard line to 40083 fuel pump

Nice installation, Gary. And I totally get the need to just "get'er done". I've experienced hose collapse on my '63 during brisk acceleration, so the phenomenon is real. Just keep the spring trick in the back of your mind in case it ever feels like your car stumbles due to lack of fuel.

Jim

[Gary B.]

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[Patrick H.]

Re: 1964-1966 rubber fuel hose connection from hard line to 40083 fuel pump

PS - After searching the ‘66 AIM and not finding a sketch showing the 40083 fuel pump or fuel line connections, I finally found a sketch in the ‘64 AIM in the L76 section. It didn’t really help...

Remember, at times and all too frequently, AIM drawings are nothing more than an approximation.
Observe them with the proverbial large grain of salt.

[Gary B.]

[Patrick H.]

Re: 1964-1966 rubber fuel hose connection from hard line to 40083 fuel pump

Gary,

Agreed.
I just see people using the drawings at times as 100% accurate when they're not.

PH

[Joseph S.]

Re: 1964-1966 rubber fuel hose connection from hard line to 40083 fuel pump

Patrick, One thing I preach at the Judging Retreat is the fact that you can only draw something 1 way. Just because it's drawn that way doesn't mean the assembly line worker installed it that way. If he/she found it easier to rotate or reverse it then that's the way it was installed.