450c fuel tank sump

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kodiakman178
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450c fuel tank sump

Post by kodiakman178 » Mon Mar 26, 2018 10:41 pm

Did like the operators manual says and drained a cup from the fuel tank sump. It barely trickled out and was full of sediment. Has anyone removed the sump or the plumbing from it to the drain cock? Should I mess w this or just continue to drain a cup a day till it clears up? New dozer owner is like having your first kid, I don’t know what’s going on ha ha ha

B Town
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Re: 450c fuel tank sump

Post by B Town » Tue Mar 27, 2018 4:51 am

I had the same issue. I ran the fuel tank down to about 5-10 gals. I bite the bullet, I felt the drain would never clean out with 1-2 cups at a time. I removed the pipe hardware and used a combination of picks, screwdrivers, wire and small fingers to break open and flush out a bunch of compacted scale. The fuel left in the tank was helpful in flushing. Now it works as it should. Take care, Bruce

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amos
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Re: 450c fuel tank sump

Post by amos » Tue Mar 27, 2018 5:12 am

After 30 or 40 years you would be surprised what collects in the fuel tank.Run the fuel down and bite the bullet an take it apart for a good cleaning. Will save you troubles in the future and you probably won't need to do it again for another 30 or 40 years.....
Amos
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Stan Disbrow
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Re: 450c fuel tank sump

Post by Stan Disbrow » Tue Mar 27, 2018 5:44 am

Hi,

Yep. This is one of those periodic maintenance items listed under '20 Years' in the manual....well, it ought to be, anyway! ;)

Stan
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kodiakman178
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Re: 450c fuel tank sump

Post by kodiakman178 » Tue Mar 27, 2018 9:51 am

Thanks for the replies. I’m sure I’ll be back w more questions soon. Thank you

B Town
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Re: 450c fuel tank sump

Post by B Town » Tue Mar 27, 2018 12:59 pm

One more word of advice. Be very gentle with the metal fittings in the sump drain. They are cast, they have a fairly large grain structure and have become more brittle over time. Ask me how I know!! I upgraded to steel fittings and I replace the valve with a 1/4 turn valve. Bruce

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DBaker98
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Re: 450c fuel tank sump

Post by DBaker98 » Tue Mar 27, 2018 1:53 pm

Yeah I had same issue with mine. It would run 30 mins and die. Had to clean fuel filter every time. I removed the fuel line and drain petcock and stuck the pressure washer in it. Clean as a whistle now. And that was several hours ago. Grass still doesn't grow where I cleaned it. Good for 30 more years.
1978 450c loader

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DBaker98
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Re: 450c fuel tank sump

Post by DBaker98 » Tue Mar 27, 2018 1:54 pm

Yeah I had same issue with mine. It would run 30 mins and die. Had to clean fuel filter every time. I removed the fuel line and drain petcock and stuck the pressure washer in it. Clean as a whistle now. And that was several hours ago. Grass still doesn't grow where I cleaned it. Good for 30 more years.
1978 450c loader

slabguy
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Re: 450c fuel tank sump

Post by slabguy » Tue Nov 10, 2020 8:57 am

Digging up an old thread...does anyone know what thread size the fuel sump drain is? The original plumbing from mine was removed and someone just replaced it with a pipe plug but I can't tell what size it is. I plan to replace with a street 90 and small ball valve for draining.

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Re: 450c fuel tank sump

Post by Jim B » Tue Nov 10, 2020 9:06 am


slabguy
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Re: 450c fuel tank sump

Post by slabguy » Tue Nov 10, 2020 9:08 am

Thanks Jim. Should have thought to look there

B Town
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Re: 450c fuel tank sump

Post by B Town » Tue Nov 10, 2020 9:19 am

IIRC there is a reducing bushing, goes from 3/4” NPT to 1/4”. I have updated several of these. I like to use the forged SS fitting, the are less likely to become brittle/crystallized over time. 1/4” NPT ball valve that is 1/4 turn is the way to go. I use an airline fitting with quick connect and plastic 3/8” airline(the kind used on OTR trucks). I route the airline to the side of the machine to keep my machine cleaner. The airline is coiled and I use the coiled memory to point the sump stream to behind the right track. I keep the line tucked in front of the ROPS down brace. Hope this helps, Bruce

slabguy
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Re: 450c fuel tank sump

Post by slabguy » Tue Nov 10, 2020 9:23 am

That sounds like a good plan. Thanks Bruce

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