How to Diagnose and Repair a Broken Lawnmower Fuel Line – Part 4

By | Last updated on |Misc. Repairs, Yard|8 Comments

How to Diagnose and Repair a Broken Lawnmower Fuel Line. The fuel filter is replaced and the mower checked for proper running. This repair is continued from How to Diagnose and Repair a Broken Lawnmower Fuel Line – Part 3.

Replace the Lawn Mower Fuel Filter

After replacing the broken and cracked fuel lines inside the gas tanks, I replaced the fuel filter for preventive maintenance. The fuel filter is located on the right front side of the engine. The fuel hoses are secured to the filter by two hose bands.

Fuel Filter - Gravely ZT1640 Lawn Mower

Fuel Filter – Gravely ZT1640 Lawn Mower

The old and new fuel filters are shown in the following photo. The black bits of dirt are on the outside case of the old filter. I purchased the new filter from my local Gravely dealer for about $4.

Notice the arrow imprinted on the case of both filters indicating the direction of fuel flow. The filter is installed with the arrow pointing towards the fuel pump.

Old and New Fuel Filters

Old and New Fuel Filters

Remove the old filter by releasing the hose band with a pair of pliers and slide the bands an inch or so down the hose. Pull the hoses off and remove the old filter.

Install the new filter by pressing on the hoses and fasten with the hose bands. Take care to install the filter with the arrow on the filter housing pointing towards the fuel filter.

New Fuel Filter Installation - Gravely ZT1640 Lawn Mower

New Fuel Filter Installation – Gravely ZT1640 Lawn Mower

Restart the Lawn Mower Engine

The engine stopped running because the intake fuel lines inside the gas tanks had deteriorated and broken off. The fuel lines, fuel filter and carburetor were bone dry when the engine quit due to fuel starvation. This is the first time starting after installing new fuel lines and all the lines are dry.

To restart the engine:

  1. Set the fuel selector/shutoff valve to the RIGHT tank (because it’s closest).
  2. Set the throttle position to Full Choke.
  3. Had a helper turn the starter key ON while watching the fuel filter. Gasoline was flowing through the fuel filter in about 3 seconds. The engine started after another 2-3 seconds of steady cranking. I set the throttle to Fast Run and the engine ran smoothly.
  4. I let the engine run a couple of minutes on the right tank, then set the fuel selector the left tank. I saw a few air bubbles in the fuel filter and the engine continued to run smoothly on the left tank.
New Fuel Filter - Filling with Gas and Engine Running

New Fuel Filter – Filling with Gas and Engine Running

The fuel level in the fuel filter dropped some with the engine running on full throttle. The engine continued to run strongly. After 10 minutes or so, I drove the mower up and down the hill and mowed some grass. Everything was fine.

Engine Running after Replacing the Fuel Lines and Filter

Engine Running after Replacing the Fuel Lines and Filter

Engine running after replacing the fuel lines and fuel filter.

Gravely ZT1640 Lawn Mower - Engine Running

Gravely ZT1640 Lawn Mower – Engine Running

I reattached the engine hood and am now ready for the rest of the mowing season.

Gravely ZT1640 - Engine Hood Re-Installed

Gravely ZT1640 – Engine Hood Re-Installed

The total cost of this repair was $36 for parts from my local Gravely Dealer and about 1.5 hours of my time. The first hour was spent diagnosing the fuel starvation problem and 30 minutes to remove and install the new parts.

Hope this helps,

Bob Jackson

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8 Comments

  1. Dayna September 23, 2010 at 7:25 pm - Reply

    I just found this problem on the mower at work and have to fix it. It looks simple enough to do. Thanks for sharing your knowledge.

  2. Kendell April 17, 2013 at 9:14 pm - Reply

    Thank you very much for this posting.
    I’m facing this problem & my local parts tech @ new mower sales bz- couldn’t find me a parts # for these gas lines.
    I’ll buy them know & should be set.

  3. Sander May 14, 2013 at 9:07 pm - Reply

    Fantastic write up. I determined that I have the same problem on my left tank on my ZT1740. Will order the tygon kit.

  4. Marshall July 5, 2016 at 11:44 pm - Reply

    Most excellent write up on the web on this repetitive issue with Gravely / Ariens mowers manufactured early 2000’s.

    It’s 2016 and I’ve run into this issue with my 12 year old ZT 1540. It looks like the parts kit has changed yet again to another version and Gravely / Ariens continues to refine the solution. Unfortunately, no one is updating the parts diagrams, but I was able to find this thread.

    Bob. It helped tremendously. Many thanks!

    • Bob Jackson July 7, 2016 at 7:43 pm - Reply

      You’re welcome!

      I checked the Gravely Parts Radar site and the part # has changed. A search on part # 59207200 now displays two results:

      59207200 20″ Fuel Line Kit (inside of tank)
      59207200 20″ Fuel Line Kit (SN 000800 and up)

      both of which have been superseded by the new part #

      Ariens 04320900 ASM- FUEL PICK-UP SML/MED TANK

      which has a black color fuel pickup tube. Installation is the same as the former part #.

  5. Mike Casavant November 11, 2016 at 5:14 pm - Reply

    Husquavana riding mower stopped suddenly when engaged for a few minutes. It now turns over but won’t start. This machine is new to me with about 300 hours on it. Would a fuel filter or pump cause this? I’ve replaced the spark plugs. Not sure what I should look at next? Any help would be appreciated. I don’t want to blindly keep replacing parts. The air cleaner looks good.
    Thanks
    Mike

    • Bob Jackson November 13, 2016 at 12:20 am - Reply

      It could be a fuel supply problem. The Husqvarna Customer Support page doesn’t provide a lot of detailed troubleshooting info. It should be straightforward to troubleshoot a no-start problem. Because you have spark it’s a lack of fuel or air.

  6. Nick April 24, 2018 at 12:52 pm - Reply

    Very nice and comprehensive presentation, we need more like this. Thanks much!

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