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Classic Mustangs Tech Forum

Technical discussions specific to 1964-1967, 1968-1970, and 1971-1973 Classic Mustang. Discuss all tech related to in-line six cylinder and V8 powered Vintage Mustangs here.

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Unread 12-25-2010   #1 (permalink)
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Default How to remove, replace and install a new fuel pump on a 1966 Mustang 289

Hi

Merry Christmas,

I have a 1966 289 C-code mustang, I want to replace my fuel pump as it leaks I accidentally ordered a fuel pump for 64/65 260/289 Mustangs Unlimited - The Premier Source for Mustang, Shelby and Cougar Parts and Accessories a while back instead of one designed for a 66 Mustangs Unlimited - The Premier Source for Mustang, Shelby and Cougar Parts and Accessories, I want to know will this one work fine as a permanent replacement instead of the one designed for it.

And how do I replace a fuel pump what are the steps involved, do i just unbolt it from the bottom of the car and replace it or do I have to remove other parts. When i had a quick look at it, it seems as the the bolt next to the oil filter would be hard to remove.

Please help, pics would be helpful and tip on how to remove it and replace it

thanks, happy holidays
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Unread 12-25-2010   #2 (permalink)
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Default How to remove, replace and install a new fuel pump on a 1966 Mustang 289

Hello 199,
I think the fuel pump will work - -BUT - -I would swap it out for the correct
one. MU is great about returns.
The 2 reasons I would swap the pump for the correct one are:
1. - The length of the ativation rod could be different
2. - You may run into fit issues with the canister style (early)

To replace the fuel pump is really quite simple.

1. - Remove the line feeding into the pump and out of the pump.

There are only 2 lines - - one feeds to the carb - the other is the inlet which comes from the tank.

PLace a small pan on the ground under the pump to catch any small drops of gas.

Position a small container underneath the fuel pump to catch any gasoline that drips out of the fuel lines when they are removed.
2
Loosen the clamp that secures the rubber fuel line to the fuel pump by squeezing the clamp's metal prongs together with a pair of pliers.
3
Slide the clamp away from the fuel pump.
4
Pull the rubber fuel line off of the fuel pump.
5
Rotate the integral nut on the tip of the metal fuel line in a counterclockwise direction with an open-end wrench until the line comes off the pump.
6
Remove the two bolts that secure the pump to the side of the timing chain cover with a socket wrench.
7
Pull the pump out of the timing chain cover.
8
Apply gasket sealer to a new fuel pump gasket then press the gasket onto the fuel pump.
9
Insert the fuel pump's metal arm into the side of the timing chain cover until the pump rests flush against the timing chain cover.
10
Install and tighten the fuel pump's two securing bolts with the socket wrench.
11
Position the tip of the metal fuel line against the fuel pump then rotate the line's integral nut in a clockwise direction with the open-end wrench until the nut is tight.
12
Press the rubber fuel line onto its nipple on the fuel pump.
13
Compress the metal tabs on the rubber fuel line's clamp with the pliers then slide the clamp onto the tip of the fuel line.

It is a pretty simple task and can be done from on top of the fender.

Any questions - -let us know

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Unread 12-25-2010   #3 (permalink)
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thanks print dad its always a pleasure having an answer from you as its always detailed

I will have my friend who will help me install it look at the existing pump and we will decided later on weather to get a a 66 one or not we will compare the size etc..

on side note I was checking your profile and it says your a printing teacher, do you teach/train press man or you more into the pre-press or in artwork (graphic design) Im in the printing business thats why im curious
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Unread 12-25-2010   #4 (permalink)
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You may also need to remove the oil pressure sending unit. I did in my 68
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Unread 12-25-2010   #5 (permalink)
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Quote:
Originally Posted by mortman View Post
You may also need to remove the oil pressure sending unit. I did in my 68
you did what?

install an early canister type in you 68?

why would or should I remove the oil pressure sending unit?
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Unread 12-25-2010   #6 (permalink)
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Quote:
Originally Posted by Print Dad View Post
Hello 199,
It is a pretty simple task and can be done from on top of the fender.

that would have been the case if i didn't have power steering.
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Unread 12-25-2010   #7 (permalink)
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He only removed the oil pressure sender for more room then put it back afterward.

I did the fuel pump on my 68 with 289 and took the power steering pump off and oil pressure sender also. But this was so I could also clean and detail them and also the engine block in that area before putting it all back together. It became one of those 'while I was at it'...........I think some of you know how that goes! :p
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Unread 12-26-2010   #8 (permalink)
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Today I had a proper look from under the car to talk a pic of the fuel pump, I realized a 65 pump is already installed on the car by the previous owner. I have no idea how long it has been on the car but I suspect its been on for many years for the looks of it, is it possible the the fuel pump is leaking cause the filter hasn't been replaced? as in clogged up with all the elements. (its not a continuous leak as it only drips a bit every time)

a link to the fuel pump on my car
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Unread 12-27-2010   #9 (permalink)
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I'm pretty sure the fuel pump is a diaphragm type pump and therefore it will not leak because of a clogged filter. A diaphragm pump can sit there trying to pump away at a totally blocked line and not be more likely to leak. The leak could be caused by a crack in the diaphragm or a bad gasket. Since you already have a replacement pump, I would go ahead and make the change. And you should replace the fuel filter anyway -- that's a cheap, easy maintenance item.
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Unread 12-27-2010   #10 (permalink)
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A few years back, my fuel pump was going out, so I stopped by the parts store to get a new one. On my way home, the pump gave out completely. So there I was, stuck on the side of the highway, with a busted fuel pump, a new replacement pump, but no tools :-(

While I was pondering my next step, a guy pulled over and he just happened to have some tools in his trunk. So 30 minutes later (I didn't have a jack so it required a bit of wiggling under the car), the new pump was in and I was on my way again.

I guess my point is, the fuel pump is quite easy to change... and to always keep some tools in your trunk when your driving a classic :smilie
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Unread 12-27-2010   #11 (permalink)
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Quote:
Originally Posted by desdain View Post
A few years back, my fuel pump was going out, so I stopped by the parts store to get a new one. On my way home, the pump gave out completely. So there I was, stuck on the side of the highway, with a busted fuel pump, a new replacement pump, but no tools :-(

While I was pondering my next step, a guy pulled over and he just happened to have some tools in his trunk. So 30 minutes later (I didn't have a jack so it required a bit of wiggling under the car), the new pump was in and I was on my way again.

I guess my point is, the fuel pump is quite easy to change... and to always keep some tools in your trunk when your driving a classic :smilie

Yeah im planning on having a tool bag in the car currently i only have a roto wrench ( i haven't tried it yet, looks more like a novelty item)

will replace the fuel pump after new years
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Unread 12-27-2010   #12 (permalink)
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Being unlucky enough to have a leaking fuel pump also, on a I6, I am going to change out the gasket.

Agreed, it is a pretty simple process- but what is the "recommended" process of using gasket sealer?

I have seen anything from no sealer, just use the gasket itself, to using sealer to to secure gasket to the fuel pump, then sealer again on the gasket when you secure it to the block.

What works the best? And, of course, there are several products that one could use to act as gasket sealer- which is a whole different conversation in itself.
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Unread 12-28-2010   #13 (permalink)
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I have never used a gasket sealer on the fuel pump and I have never had a problem. Just be sure to place the gasket correctly and torque the two bolts down to the right spec and do it by alternating between the two bolts so you don't overstress one side of the fuel pump housing or gasket.
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