Does fuel filter need to be full

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nicoz
40C crawler
40C crawler
Posts: 11
Joined: Sun Jun 10, 2018 5:39 pm

Does fuel filter need to be full

Post by nicoz » Sat Aug 11, 2018 9:46 am

I am having issues with my machine randomly stalling out but restarting without a problem. One thing I noticed is that the primary fuel filter doesn't fill completely (stays about 1/3 full. I seem to recall that when I replaced it and primed it a while ago, it filled and then came out the bleed screw. I tried bleeding it again and it flows fine out the bleed screw but doesn't fill the filter completely. Am I wrong to assume it needs to remain full always or am. I just remembering incorrectly?
Current Machine: 1981 John Deere 450C w/ 9300 Backhoe

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Rincon
420 crawler
420 crawler
Posts: 35
Joined: Tue Jan 16, 2018 3:00 pm
Location: Las Vegas , NM

Re: Does fuel filter need to be full

Post by Rincon » Sat Aug 11, 2018 10:56 am

My 450C C filter is always full

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Stan Disbrow
350 crawler
350 crawler
Posts: 2548
Joined: Fri Jul 15, 2005 3:13 pm
Location: Raleigh, NC

Re: Does fuel filter need to be full

Post by Stan Disbrow » Sat Aug 11, 2018 1:38 pm

Hi,

Needs to be full. Time to bleed it again. If it keeps happening, you need to find the source of the air leak.

Stan
There's No Such Thing As A Cheap Crawler!

Have: '58 JD 420c 5-roller w/62 inside manual blade
Have: '78 JD350C w/6310 outside manual blade
Useta Have: '68 JD350, '51 Terratrac GT-25
Also Have: 1950 M, 2005 x495, 2008 5103 (now known as 5045D)

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gregjo1948
2010 crawler
2010 crawler
Posts: 735
Joined: Mon Aug 30, 2010 5:58 am
Location: Newark Valley,NY,USA

Re: Does fuel filter need to be full

Post by gregjo1948 » Sun Aug 12, 2018 5:24 am

Does a 450 have a fuel lift pump to put fuel to the filters?
JD 350B diesel w/rops & 6way blade, Case 580B Loader/backhoe, Farmall 504 highcrop, International 404 utility, International 284 diesel w/belly mower, 1972 Ford F600 dump truck, Galion 3-5 roller

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Rincon
420 crawler
420 crawler
Posts: 35
Joined: Tue Jan 16, 2018 3:00 pm
Location: Las Vegas , NM

Re: Does fuel filter need to be full

Post by Rincon » Sun Aug 12, 2018 8:32 am

Yes , fuel injector lift pump.

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DrLoch
1010 crawler
1010 crawler
Posts: 308
Joined: Thu Jul 04, 2013 6:39 am
Location: Mebane NC

Re: Does fuel filter need to be full

Post by DrLoch » Sun Aug 12, 2018 9:44 am

Mine is also always full, Also check all the usual things;

Vent hole in fill cap is open.
450C Track Loader
291457T

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gregjo1948
2010 crawler
2010 crawler
Posts: 735
Joined: Mon Aug 30, 2010 5:58 am
Location: Newark Valley,NY,USA

Re: Does fuel filter need to be full

Post by gregjo1948 » Sun Aug 12, 2018 10:22 am

Rincon wrote:
Sun Aug 12, 2018 8:32 am
Yes , fuel injector lift pump.
Perhaps the lift pump is weak or drawing air and not supplying enough fuel to keep the filter full.
JD 350B diesel w/rops & 6way blade, Case 580B Loader/backhoe, Farmall 504 highcrop, International 404 utility, International 284 diesel w/belly mower, 1972 Ford F600 dump truck, Galion 3-5 roller

B Town
1010 crawler
1010 crawler
Posts: 302
Joined: Fri Dec 11, 2015 7:04 pm
Location: Western Iowa

Re: Does fuel filter need to be full

Post by B Town » Sun Aug 12, 2018 11:43 am

Check engine oil for diesel contamination. Those pumps have an o ring on the engine side. They leak fuel into the engine oil; therefore, I believe it is possible to develop air in the fuel system. This type of problem needs to be caught early. Stan can give us an education on the properties of diesel mixed with oil.

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Stan Disbrow
350 crawler
350 crawler
Posts: 2548
Joined: Fri Jul 15, 2005 3:13 pm
Location: Raleigh, NC

Re: Does fuel filter need to be full

Post by Stan Disbrow » Sun Aug 12, 2018 4:40 pm

Hi,

Yeah, that'd be bad. Diesel thins the oil and it flies out between the rod bearing and the crank and....no more cushion. Not long after, beat up crank journal. After that, the best hope is the thing quits before the main bearings get it as well.

Stan
There's No Such Thing As A Cheap Crawler!

Have: '58 JD 420c 5-roller w/62 inside manual blade
Have: '78 JD350C w/6310 outside manual blade
Useta Have: '68 JD350, '51 Terratrac GT-25
Also Have: 1950 M, 2005 x495, 2008 5103 (now known as 5045D)

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