fule line on a 853

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D&D Tree

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Dec 21, 2006
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I want to change the fule line from the tank but I can't find where it goes in. Also when I start it up it runs but sounds like it's not getting fule. If I pump the primer bulp it speeds up and runs ok. After it warms up for about 10 min. it will run ok. I just changed the fillter.
 

perry

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Aug 22, 2006
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I was curious about the same thing and ask a BC mechanic, I'll need to check with him again but, I believe he said to remove the hyd. reservior and it would be easy to get to.
 

Tazza

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I was curious about the same thing and ask a BC mechanic, I'll need to check with him again but, I believe he said to remove the hyd. reservior and it would be easy to get to.
Does this machine run a Peugot engine? The primer pump sounds a lot like what other users said when their lift pump was bad. They could pump the primer bulb and the engine would speed up. The only problem is the lift pump on those engines are part of the injector pump, and very expensive....
 

D&D Tree

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I was curious about the same thing and ask a BC mechanic, I'll need to check with him again but, I believe he said to remove the hyd. reservior and it would be easy to get to.
Thanks, I have a manual but it doesn't show the fule line. They don't make anything easy on this machines do they.
 

bobbie-g

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Mar 15, 2004
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Thanks, I have a manual but it doesn't show the fule line. They don't make anything easy on this machines do they.
I'm probably the one Tazza was referring to what had a wimpy fuel injector/pump assembly. First, I think the Peugeot enging was only used on the 751C from about '95 to '97. It's a 38hp and would not have been used in the 853, unless they picked a larger Peugeot engine. -- Whilst diagnosing everything under the sun having to do with the fuel system besides the fuel pump (let's do the most expensive thing last!), I picked up some tidbits. First, make sure your fuel filter is new and OK. If there's a bleed screw somewhere (mine has two, one on the filter and one at the injector pump), pop it open and make sure when you pump the primer bulb you get only squirts of clean, pure fuel. If you get foamy or bubbly fuel, you're ingesting air somewhere. Where would that be? Maybe the rubber fuel line from the tank to the filter, or maybe the pickup line inside the tank is cracked. If the latter is the case, then filling the tank completely up should make the problem go away until you use enough fuel to get down below where the crack is on the pickup line. There's also a small fiter screen on the bottom of the pickup line, which obviously should not be clogged. Access to that pickup tube on my 751 is a real chore, I just had the Bobcat folks do it while we were trying to figure out what the problem was. In the end, it turned out to be a lift pump. On the Peugeot engine, the lift pump and the high-pressure injector pump are in the same housing. $1350 for a new one, maybe a few hundred to replace it. Good luck, and let us know how you fare. ---Bob
 

skidsteer.ca

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Jan 20, 2006
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I'm probably the one Tazza was referring to what had a wimpy fuel injector/pump assembly. First, I think the Peugeot enging was only used on the 751C from about '95 to '97. It's a 38hp and would not have been used in the 853, unless they picked a larger Peugeot engine. -- Whilst diagnosing everything under the sun having to do with the fuel system besides the fuel pump (let's do the most expensive thing last!), I picked up some tidbits. First, make sure your fuel filter is new and OK. If there's a bleed screw somewhere (mine has two, one on the filter and one at the injector pump), pop it open and make sure when you pump the primer bulb you get only squirts of clean, pure fuel. If you get foamy or bubbly fuel, you're ingesting air somewhere. Where would that be? Maybe the rubber fuel line from the tank to the filter, or maybe the pickup line inside the tank is cracked. If the latter is the case, then filling the tank completely up should make the problem go away until you use enough fuel to get down below where the crack is on the pickup line. There's also a small fiter screen on the bottom of the pickup line, which obviously should not be clogged. Access to that pickup tube on my 751 is a real chore, I just had the Bobcat folks do it while we were trying to figure out what the problem was. In the end, it turned out to be a lift pump. On the Peugeot engine, the lift pump and the high-pressure injector pump are in the same housing. $1350 for a new one, maybe a few hundred to replace it. Good luck, and let us know how you fare. ---Bob
You have to roll back the cab to see where the fuel line goes int the tank. just behind rear axel.
Lift pump is built into injection pump on these Isuzu engines.
Try conecting the primer bulb to a temp fuel tank and see how it runs. It could be a blocked line or pickup problem in the tank. but is more likely a lift pump issue. If you extend the line from the tank down can you get it to siphon fuel?
Ken
 

D&D Tree

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Dec 21, 2006
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You have to roll back the cab to see where the fuel line goes int the tank. just behind rear axel.
Lift pump is built into injection pump on these Isuzu engines.
Try conecting the primer bulb to a temp fuel tank and see how it runs. It could be a blocked line or pickup problem in the tank. but is more likely a lift pump issue. If you extend the line from the tank down can you get it to siphon fuel?
Ken
Thanks for the tips all. After about 10 min. it runs fine and takes the fule,could this still be the pump? Also I have a leak in the fule line or fule tank so I'm thinking of pulling it out. I have a shop manual but is it a big job to pull the motor. I looked under the cab to see where the line goes into the tank to look for a leak but you can't see it or get your hand down to it. From the pic in the manual it looks like it's behind the motor.
 

Fishfiles

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Feb 8, 2007
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The fuel line on and 853 is hard to get at , it is between the sunstrand pump and the motor closer to the left side of the machine if you were sitting in the seat , and it is slightly under the pump , it is probally the hardest fuel line to get to of all the Bobcat models that I have worked on , it goes into the tank with a rubber grommet and a steel 90 degree fitting that pushes into the grommet ,the older ones had soft rubber hose and a screen with a check ball built in , the dealers retro fit fuel tube is hard plastic with no screen --------on you fuel leak problem , I have seen a few 853's get holes in the tank from 3 different cause , one is the plate on the bottom of the machine which is held on with 3 -3/8 bolts and covers the chain case and fuel tank drain plugs getting knocked off and something poking in and damaging the tank , another is there is a hole in the side of the machine , it looks like a weldment bushing , have seen a rebar go thru that hole and hit the tank , another is small rocks getting in the engine compartment and rubbing in between the oil pan and the tank , seen a few oil pans get holes in them from the rocks also , this last problem is usually from the rubber part of the motor mounts getting worn down from oil soaking into them and allows the motor to sag down , seen a few break the motor mount bracket right by the fuel filter , there is a retro fit bracket for that problem
 
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