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271 fuel pump
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WaltDevore View Drop Down
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Joined: 03 Jan 2020
Location: IdahoSprings CO
Points: 143 		Post Options Post Options   Thanks (0) Thanks(0)   Quote WaltDevore Quote  Post ReplyReply Direct Link To This Post Topic: 271 fuel pump
    Posted: 14 Dec 2020 at 9:40pm
Well Gentlemen, the saga continues.

I received an universal fuel pump rebuild kit for my HD5G and of course it's not the right one.  More than that, my parts book the covers all serial numbers does not show this kind of pump.  So a new pump is on order.  I think the side spring plunger mechanism is the problem and don't know if the one in the kit would work.  I don't want to open it  and lose the ability to return it.  The parts guy thinks this is a very old original pump.  It looks too simple, how can it pump?  The double gear is not there.  Any suggestions?
Here are the pictures:
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Coke-in-MN View Drop Down
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Joined: 12 Sep 2009
Location: Afton MN
Points: 41614 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Coke-in-MN Quote  Post ReplyReply Direct Link To This Post Posted: 14 Dec 2020 at 11:56pm
Call it a Wankel engine and you will understand - the rotor is off center on the shaft and travels a elliptical circle inside housing thus creating cavitation and displacement as it travels , it creates pressure as it displaces fuel and discharges it out side port . while the opposite side of eccentric creates a vacuum to draw fuel in .
 Now just like a gear pump the clearance of rotor to casting of body has to be next to 0 or leakage will just bypass the full eccentric . 
 Might have to face both sides by lapping and then see if a thinner or thicker gasket is needed to get proper clearance of rotor to case clearance .
Faith isn't a jump in the dark. It is a walk in the light. Faith is not guessing; it is knowing something.
"Challenges are what make life interesting; overcoming them is what makes life meaningful."
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WaltDevore View Drop Down
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Joined: 03 Jan 2020
Location: IdahoSprings CO
Points: 143 		Post Options Post Options   Thanks (0) Thanks(0)   Quote WaltDevore Quote  Post ReplyReply Direct Link To This Post Posted: 15 Dec 2020 at 12:01am
Thanks for that.  Interesting it didn't make the Parts Book.  I guess the non heroic thing to do is be happy I can put an "updated" pump on.  Must be a good reason it became obsolete
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SteveM C/IL View Drop Down
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Joined: 12 Sep 2009
Location: Shelbyville IL
Points: 8247 		Post Options Post Options   Thanks (0) Thanks(0)   Quote SteveM C/IL Quote  Post ReplyReply Direct Link To This Post Posted: 15 Dec 2020 at 8:18am
The gear pump is definitely more positive pressure. I assume you do have fuel getting to the pump? As I remember, you are to leave outlet injector lines loose and crank with racks closed until fuel purges air from injectors. It's all in the manual.
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WaltDevore View Drop Down
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Joined: 03 Jan 2020
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Points: 143 		Post Options Post Options   Thanks (0) Thanks(0)   Quote WaltDevore Quote  Post ReplyReply Direct Link To This Post Posted: 15 Dec 2020 at 10:12am
Thanks for reminding me.
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