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Fuel Pump Feature - Glass Bowl; 12.09 Fuel Pump
Topic Started: Mar 7 2009, 01:50 PM (1,194 Views)
yjcanibul
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yet another question - I am the type that likes to know a bit about something before I tear it apart for a reconditioning ...

so, I have noticed alot of fuel pumps mounted that have the glass bowl , I do not , I think I read its to separate water like a filter ... is that something that would only be used in warmer climates ?

here, you can almost freeze gas in mid winter , so perhaps a bowl was not installed ?

Posted Image


thanks in advance

Randy


EDIT - add picture from 3B Page of bowl type

Posted Image

57 3B : big speedo / Hurricane / YF 938 SD / IAY-4012 / T90 / D18 / 5.375 final drive / open diffs / Firestone 6ply Military NDCC / 12v Delco SI alt / Kayline Top / venting windshield / tub patched / "still fixing leaks one at a time"

89 wrangler : h/duty axles + 5spd / 200+hp 4.2L / arb locked / multiport fuel inj / warn hubs+winch / 1/4 mil km / fishing+trail riding / gets me to work
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oldtime
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Good question Randy,

The glass dome (inverted bowl) seen on all original fuel pumps which were in use on all CJ models was intended for use as a visual aid.
It simply allows one to observe whether or not the fuel pump is functioning satisfactorily.
In use the fuel pump can be observed if pumping fuel.
One should see mainly fuel and some small air bubbles which are located near the top of the glass dome.
That alone indicates whether the fuel is being pumped or not.
It does not indicate fuel pressure which is regulated by check valves.
When the engine is shut off the fuel level in the glass dome will come to rest at about 7/8 full or so.
You can then see that the fuel level is well above the outlet port of the pump body.

Having a similar concept "a glass sediment bowl" is used to seperate and allow observation of fuel contamination
within the fuel system.
This is mainly useful for water seperation but can also employ particulate filtration via screening.

Thirdly some old Holley carburetors (model 1904) use a glass fuel well cover which allowed one to obsrve
for correct fuel level within the well.
Due to the design of this carburetor it is critical that a precise fuel level be maintained.
These model 1908 Holley carburetors can potentialy be adapted for use with the F-134 Hurricane.
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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Willys3b
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Randy, your pump is the double action pump. it is a combination fuel pump and vacuum pump. The vacuum pump is used to boost the engine vacuum used to operate the vacuum wipers. I usually don't see those with the glass bowl. More desireable I would think. I am not sure you can still but those.

Terry
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Rus Curtis
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Randy,
AFAIK the original pump was a double action with a glass bowl. Mine has this type. The glass bowl replacement pumps I have seen do not have the vacuum action. The replacement pumps with vacuum are all metal as pictured. Lawrence Wade's pump is also a double action original as seen here:

Posted Image



I remember reading somewhere (here, g503 or WillysTech) that the bowl was discontinued due to safety concerns. I'm not sure about that as they are still available just without vacuum. Perhaps someone else can explain the difference.
Rus Curtis
Alabama
'54 CJ-3B "Green Gruntt"
Bantam T3-C
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jeeper50
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ol' skool jeeper jeff
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I bought a rebuilt vacuum pump and swapped over my glass bowl fuel pump over to the new pump using the new diaphram.

Posted Image
In the land of the blind... the one eyed man is king
Texan at heart, Georgian by paycheck

'53 CJ3B, F134, 12v alternator, lockrights, Hot-Spark electronic module,11"self energizing brakes, Belleview winch, Beachwood summertop, OD color, built to honor all Veterans of this great country


Kayaks- Hobie Revo 13, Hobie Outback 12' both ready for the salt...
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yjcanibul
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great info

looking around the spec 'single action' showed up so was starting to wonder - I see now what your telling me - so along the way a few combo's could be installed :

- single action glass bowl
- double action glass bowl
- double action no bowl

did I miss any ?

I like the idea of the bowl , I've seen something similar before on garden/lawn or tractors long ago - the term 'separator' comes to mind , originally my thought was if collecting diluted water/gas it would most likely freeze maybe crack if it dipped below -40F

57 3B : big speedo / Hurricane / YF 938 SD / IAY-4012 / T90 / D18 / 5.375 final drive / open diffs / Firestone 6ply Military NDCC / 12v Delco SI alt / Kayline Top / venting windshield / tub patched / "still fixing leaks one at a time"

89 wrangler : h/duty axles + 5spd / 200+hp 4.2L / arb locked / multiport fuel inj / warn hubs+winch / 1/4 mil km / fishing+trail riding / gets me to work
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Rus Curtis
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Randy,
I"m no fuel expert but...

If you observe water in the glass bowl, I feel the expansion will push the fuel forward towards the carb or be forced out around the bowl gasket before the bowl cracked. However, as Ken has indicated, this bowl allows you to observe what's going on and water collecting in the bowl indicates a problem with your fuel system that IMHO would manifest elsewhere, i.e. poor idle, misfire, etc. due to water in the fuel (if its in the bowl, its in the tank and carb). The bowl would allow you to confirm your suspicions. If there's enough water in line to freeze, the vehicle won't start until thawed anyways. I'm not sure, but an additive as a preventative measure may be a good idea for extreme temps that you mention.

Any of the replacement pumps offered by jeep vendors should work. If you want to get an original dual action with bowl, I'd suggest a vendor that offers take-off used parts.
Rus Curtis
Alabama
'54 CJ-3B "Green Gruntt"
Bantam T3-C
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jeeper50
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ol' skool jeeper jeff
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Here's one;

http://cgi.ebay.com/ebaymotors/WILLYS-JEEP...sQ5fAccessories
In the land of the blind... the one eyed man is king
Texan at heart, Georgian by paycheck

'53 CJ3B, F134, 12v alternator, lockrights, Hot-Spark electronic module,11"self energizing brakes, Belleview winch, Beachwood summertop, OD color, built to honor all Veterans of this great country


Kayaks- Hobie Revo 13, Hobie Outback 12' both ready for the salt...
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ewilson
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Good Stuff! You can buy the "no glass" replacement pumps and swap the tops to retain your glass bowl.
Of course, the fuel that goes on to the carburator travels through the fine mesh screen elevated in the center which allows the heavier sediment to settle in the bottom, visible through the glass bowl.

After I installed my poly gas tank, it took several days for the plastic debris to clear and the fuel pump was where I cleaned it out.
Ed
WIRE PALADIN SAN FRANCISCO
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