990 Fuel Pump

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txtractorguy
Posts: 32
Joined: Wed May 04, 2016 11:15 pm
Location: Houston, Texas

990 Fuel Pump

Post by txtractorguy » Mon May 07, 2018 5:44 pm

I'm getting ready to purchase a fuel pump for my DB 990, and I see there are two listed in the parts manual.

K944997 for the original AC-Delco E/FP63154/B, and
K909944 for the original AC-Delco E/FP93154/A

What's the difference between these two?

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db2d
Posts: 2083
Joined: Fri Feb 24, 2012 10:01 pm
Location: Monmouthshire

Re: 990 Fuel Pump

Post by db2d » Mon May 07, 2018 6:38 pm

The 909944 pump incorporates a sediment bowl and the other one as far as I am aware,without checking, dose not.

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mc
Posts: 111
Joined: Mon Jan 17, 2011 8:35 pm
Location: Yorkshire

Re: 990 Fuel Pump

Post by mc » Mon May 07, 2018 10:59 pm

K909944 is the original one with glass bowl
K944997 is the same with glass bowl, but with the top moved round in relation to the base by one screw hole.
Both these are replaced by K311939 which does not have a glass bowl.
K311939 has now been replaced by 47672994 (without glass bowl) by CNH.
All the above are interchangeable but you may need to remove the 6 screws to realign the top & base.

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txtractorguy
Posts: 32
Joined: Wed May 04, 2016 11:15 pm
Location: Houston, Texas

Re: 990 Fuel Pump

Post by txtractorguy » Tue May 08, 2018 3:05 pm

Thanks for the replies. After posting, I realized I was looking at a parts list for 1971-1976 model 990s. Mine is a 1968. I don't have a parts list for 1968.
I'm hoping it's the same. Can anyone help with that?

1952CROPMASTER
Posts: 93
Joined: Thu Dec 15, 2016 12:24 pm
Location: Moncton NB

Re: 990 Fuel Pump

Post by 1952CROPMASTER » Wed May 09, 2018 2:23 am

Google SPAREX USA & enter DB Part # K909944 or K944997 & both #'S will give you the SPAREX # S.63034, most Farm Equipment Dealers deal with sparex or another aftermarket parts,

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txtractorguy
Posts: 32
Joined: Wed May 04, 2016 11:15 pm
Location: Houston, Texas

Re: 990 Fuel Pump

Post by txtractorguy » Mon May 14, 2018 3:13 pm

I was able to get a picture of the fuel pump this weekend. See attached.
Attachments
Fuel Pump.jpg
Fuel Pump.jpg (88.06 KiB) Viewed 2357 times

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txtractorguy
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Location: Houston, Texas

Re: 990 Fuel Pump

Post by txtractorguy » Mon May 14, 2018 3:14 pm

As you can see in the picture in the previous post, the orientation of the lines coming in/going out are 9 o'clock/3 o'clock. Most of the ones I've seen on the internet have the orientation at 7 o'clock/1 o'clock. I've only found one fuel pump from my internet searching so far that has the 9/3 orientation, like this picture. I hope this is the correct one I need.
Attachments
s-l1600.jpg
s-l1600.jpg (19.67 KiB) Viewed 2357 times

jazo
Posts: 773
Joined: Fri Jun 15, 2007 7:13 am
Location: New Zealand

Re: 990 Fuel Pump

Post by jazo » Mon May 14, 2018 9:26 pm

Hi as mentioned earlier you can just undo the 6 screws and rotate around to your desired position
1394 4wd
1294 4wd
30D
990x2
880
780x2
900

philedge
Posts: 236
Joined: Sun Dec 03, 2006 11:27 am
Location: Chester UK

Re: 990 Fuel Pump

Post by philedge » Tue May 15, 2018 8:47 am

I cant quite understand the purpose of the glass bowl when its mounted on top of the lift pump. Any water or debris will just drop back into the pump and pass into the fuel filters?? Shouldnt the bowl be beneath the pump to trap water/debris?
'66 880 Selectamatic rat.

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db2d
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Location: Monmouthshire

Re: 990 Fuel Pump

Post by db2d » Tue May 15, 2018 9:53 am

There is a gauze filter under the glass bowl and if any water is present it will be visible

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ollek
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Location: South West Finland

Re: 990 Fuel Pump

Post by ollek » Tue May 15, 2018 4:28 pm

And if you look at the picture of the lift pump you have supplied, you will se that there is kind of a pipe in the centre of the glass bowl. The mesh sits on top of the pipe and the space below the gauze and around the pipe is where the water and dirt is collected. The fuel to the filters and injection pump travels trough the gauze, sitting higher up.

philedge
Posts: 236
Joined: Sun Dec 03, 2006 11:27 am
Location: Chester UK

Re: 990 Fuel Pump

Post by philedge » Tue May 15, 2018 5:28 pm

I can see now how it would trap dirt and water on top of the pump but seems an odd arrangement to have bowl seemingly inverted as the moment you release the bowl the contents dump all over the pump and leave a film of dirt sat on top of the pump. I suppose its cheaper to manufacture than a unit with the bowl before and separate from the pump.
'66 880 Selectamatic rat.

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ollek
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Location: South West Finland

Re: 990 Fuel Pump

Post by ollek » Tue May 15, 2018 6:09 pm

The pump type in question have been used by almost every tractor manufacturer and fitted to millions of tractors. You can wipe the pump and the surroundings dry and clean after removing the glass bowl, if you have a cloth at hand. Do you have any other minor things you might want to make a complaint about.

philedge
Posts: 236
Joined: Sun Dec 03, 2006 11:27 am
Location: Chester UK

Re: 990 Fuel Pump

Post by philedge » Tue May 15, 2018 9:07 pm

Its just an observation- no ones complaining. My 880 must be different to the millions of others as it has the glass bowl before the pump orientated so the bowl can be removed without dumping the contents on the floor. Seems a better solution to me, but thats just an observation/opinion, not a complaint:)
'66 880 Selectamatic rat.

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ollek
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Joined: Tue Apr 10, 2012 1:20 pm
Location: South West Finland

Re: 990 Fuel Pump

Post by ollek » Wed May 16, 2018 10:05 am

The glass bowl orientation can be different from one pump to another, but the bowl is always before (on the suction side) the actual pump diaphragm and the valves.

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