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DJ3A Fuel Pump
Topic Started: Sep 4 2014, 12:15 PM (700 Views)
PapaC
Papac
[ *   *   *   *   *  ]
After the recent discussion on the 3B side of this forum concerning dual stage fuel pumps and vaccum wipers I decided to upgrade from the cheap generic single stage glass top fuel pump I recently bought.

I went back to the parts list and wasn't having much luck determiming exactly what I wanted. And then, low and behold I ran across a old post by Ken (oldtime) who knows everything :) and there were my numbers I was looking for.



Quote:
 
KEN...The DJ's used AC 9716, AC 4698 or AC 9562 fuel pumps.



I started looking and couldn't find any of the first two numbers but I found several of the AC 9562 on Ebay.

I'll tell you PRICEY little suckers for a fact at 200.00 give or take and up!!


Negotiated a new one in the box down from what he was asking to less than half price by explaining truthfully my wife was going to KILL me!!!

Still pricey but original and if I ever finish the thing, get a top on it and hit the road I won't have to worry about my vaccum wiper or wipers fading out during a rain which could very well become a safety issue.

Herein lies my question. Shouldn't I now be looking for a modern rebuild kit with neoprene diaphragms to compensate for modern gas or run it as is?

Posted Image


Posted Image
Charles Tate....North Mississippi

1956 WILLYS DJ3A Convertible
Doing ground up nuts and bolt restoration by almost entirely reconditioning original used or a few NOS DJ3A parts.

1962 WILLYS DJ3A Convertible. (For research and parts only)
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D518
Member
[ *  ]

The DJ3A's used a single action metal top fuel pump, no vacuum wiper type! The unusual DJ3A intake manifold accommodates the vacuum wipers and is much, much more reliable!
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PapaC
Papac
[ *   *   *   *   *  ]
See, I knew I should have asked FIRST!! :)

I was 'trying' to go by this from the 1955 preliminary parts list but I didn't know how to cross reference (still don't) the number.


Posted Image

http://www.jeepsurreygala.com/?page_id=1133
Charles Tate....North Mississippi

1956 WILLYS DJ3A Convertible
Doing ground up nuts and bolt restoration by almost entirely reconditioning original used or a few NOS DJ3A parts.

1962 WILLYS DJ3A Convertible. (For research and parts only)
Offline Profile Quote Post Goto Top
 
PapaC
Papac
[ *   *   *   *   *  ]
The AC 9562 vacuum-fuel pump came in today. Appears to have multiple or layered diaphragms, you can see them sticking out in a couple of places.

Even though the box was a bit rough the Nos pump still looks new and what I could see of the diaphragms felt soft and pliable. My intentions now are to use it as is, try to stay away from ethanol as much as possible and in the meantime keep an eye out for a kit just in case it's ever needed.
Charles Tate....North Mississippi

1956 WILLYS DJ3A Convertible
Doing ground up nuts and bolt restoration by almost entirely reconditioning original used or a few NOS DJ3A parts.

1962 WILLYS DJ3A Convertible. (For research and parts only)
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oldtime
Member Avatar
MODERATOR
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I don't llike the adulterated ethanol fuel either but would not worry about it effecting your NOS AC fuel pump.
My experience shows that the original OEM diaphrams should easily outlast your needs.
Currently building my final F-134 powered 3B .
Rock Crawler using factory parts from the Willys Motors era (1953-1963)

http://s4.zetaboards.com/CJ3B_Bulletin_Board/topic/30228766/1/#new
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PapaC
Papac
[ *   *   *   *   *  ]
Emergency Question:

The fuel pump came with two gaskets but no spacer. I installed it without a spacer but now I'm nervous about it and wondering if I did the right thing?

Charles Tate....North Mississippi

1956 WILLYS DJ3A Convertible
Doing ground up nuts and bolt restoration by almost entirely reconditioning original used or a few NOS DJ3A parts.

1962 WILLYS DJ3A Convertible. (For research and parts only)
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PapaC
Papac
[ *   *   *   *   *  ]
EDIT BY ADDING THIS QUOTE FROM OLDTIME WITH CORRECT INFORMATION CONCERNING INSTALLING AN OPTIONAL DUEL FUEL PUMP TO A DJ


Quote:
 
. Oldtime:


Thanks for uploading the pics of your OEM NOS AC 9563 fuel pump.

One of the reasons why we see so many different models of AC pumps used on the Willys 134 engine
was that various models and vintages of jeeps had differing requirements for plumbing of the pump unit.
The earliest (pre 1949) Jeep models were not equipped with vacuum assisted pumps while most later jeeps were so equipped.
The type of crankcase ventilation installed onto a particular jeep model also changes the location and the desired form of the pump fittings.

The finish treatment used was partly dependent on the type of metal being finished.
Steel components could be finished via electro-plating.
Electroplating provided either a yellow or a white zinc finish.
Aluminum based pot metals can be finished via anodizing or using an alodine solution.
None of them used a true hot dipping process.

With dual pumps used on a Willys 134 the fuel section is always on top side with the vacuum section below.

Yes,
Willys did use a spacer on all versions of the 134 pumps having vacuum assist.

To my knowledge I first brought up the topic of the fuel pump spacer several years back.
At that time I did some research into the reasons for it's use.
The measuring was one of my early techniques used to determine what shape and length of various design pump arms could be used to actuate the 134 pump.
Since my initial findings several years have now passed.



"YES" The pump volume is effected by the use of the spacer.
The 134 engine has little need for high fuel volume.
On Willys 134 engines the spacer only serves to relocate the pump further out away from the driving eccentric.
That extra distance increases the leverage and therefore it decreases the pump stroke making it slightly easier to cycle the pump.
Decreasing the pump stroke decreases wear on the pump components and also the camshaft eccentric.

A few pumps like the AC 4693 may require the spacer as an absolute "must have" because of the form or design of the eccentric follower.
On most all pump levers the eccentric needs to ride at the center of the lever concave.
The need for a mounting spacer really depends on the individual lever design.
Some aftermarket pumps may actually be better off without the spacer and that is partly were the measuring comes into focus.

As you know the specific components used on any jeep are dependent on the model and vintage.
Some of your PCV components were identical to very early SW and PU parts while others are unique for the DJ's only.

Early DJ's used AC 9562 pumps while the later DJ's were equipped with AC 4698 pumps.

Now as for your particular application.
The 1956 DJ requirements are further detailed..

First off the pump with the additional "petcock" valve...
To my knowledge that is not a DJ part.
It was most likely used on other vehicle makes or models.

The DJ engine was original with open crankcase ventilation.
Therefore your vacuum pump was not plumbed in like a closed PVC system.

The additional components you need are as follows:

QTY (1) # 647669 mounting spacer (.140 thick)
QTY (2) 5/16" x 18 x 1-1/2" mounting bolts
QTY (2) Rectangular mounting washers
QTY (2) 1/4" tube clips
QTY (1) 1/4" inverted flair tube connector
QTY (3) 1/4" inverted flair tube 90* elbow
QTY (1) Windshield wiper tube assembly (pump to flex hose)


--------------------
Charles Tate....North Mississippi

1956 WILLYS DJ3A Convertible
Doing ground up nuts and bolt restoration by almost entirely reconditioning original used or a few NOS DJ3A parts.

1962 WILLYS DJ3A Convertible. (For research and parts only)
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