LS 170 power problems

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pkbirchbay

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Dec 20, 2014
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have a ls170 runs for about 15 mins then bogs down and dies. no waring lights or alarms come on. Have replaced fuel filters and air filters checked all lines checked for water in fuel and fuel lines. Anyone have any ideas as to what to check for next. THIS machines sit in a heated garage and has been well maintained. have had it for many years. Ned to slove this problem asap as snow is on it's way. All help needed
 
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pkbirchbay

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Dec 20, 2014
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Let's start cheap loosen your fuel cap and see how it does might just be a pluged vent
OK have done that have checked the pickup line out of the tank. lets get deep think it could be the fuel solenoid but not sure working that one. so what would your next step be? By the way thanks for your input I need help bad.
 

antfarmer2

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Oct 28, 2013
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OK have done that have checked the pickup line out of the tank. lets get deep think it could be the fuel solenoid but not sure working that one. so what would your next step be? By the way thanks for your input I need help bad.
I would try the solenoid too
 
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pkbirchbay

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Dec 20, 2014
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Does it have a fuel pump
This is what I did last night. I pulled the fuel pickup line out of the tank and made sure it was not plugged op or bad. Next I replaced the inline fuel filter( which was new to start with) Then I replaced the fuel line from tank to filter, and the line from the filer to the pump. I also did a flow test from the tank thru the pump( good fuel flow out of pump) Then I pulled the fuel line from the pump to the screw on filter and the filter to the injector port and replaced that line. Did a second pump test with the new lines. good flow filled the lines and pumped hard. Next I pulled the air filters and blew them out(had replaced them this summer) Checked the fuel cap again to make sure it was venting. Nest I did a test run of the machine and boom everything works fine again. What I found out is the new 1st inline filter that I had replace must of been bad from the box when I plugged the out port and put a little air into it one of the seams leaked just a very little bit and that must of been enough for the machine to draw more air then fuel thru the line. End of story Don't buy cheap inline fuel filters for a good machine. Spent a couple more bucks and save yourself hours of troubleshooting for a 4 dollar part!!! But I must thank you for you input and hope this helps someone else down the road. How a very simple thing can lead you on a wild goose chase.
 

antfarmer2

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Joined
Oct 28, 2013
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2,801
This is what I did last night. I pulled the fuel pickup line out of the tank and made sure it was not plugged op or bad. Next I replaced the inline fuel filter( which was new to start with) Then I replaced the fuel line from tank to filter, and the line from the filer to the pump. I also did a flow test from the tank thru the pump( good fuel flow out of pump) Then I pulled the fuel line from the pump to the screw on filter and the filter to the injector port and replaced that line. Did a second pump test with the new lines. good flow filled the lines and pumped hard. Next I pulled the air filters and blew them out(had replaced them this summer) Checked the fuel cap again to make sure it was venting. Nest I did a test run of the machine and boom everything works fine again. What I found out is the new 1st inline filter that I had replace must of been bad from the box when I plugged the out port and put a little air into it one of the seams leaked just a very little bit and that must of been enough for the machine to draw more air then fuel thru the line. End of story Don't buy cheap inline fuel filters for a good machine. Spent a couple more bucks and save yourself hours of troubleshooting for a 4 dollar part!!! But I must thank you for you input and hope this helps someone else down the road. How a very simple thing can lead you on a wild goose chase.
G
 
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