Changing fuel in a GR1600-II mower?

DanielCoffey

New member

Equipment
GR1600-II
Mar 31, 2019
4
0
0
UK, South Ayrshire
Hello folks - I would appreciate some advice before I change the fuel in a Kubota GR1600-II mower that I have purchased second-hand.

The machine has been used pretty roughly by a commercial garden landscaping company for two years (several cosmetic dings and some rusty spots on the top of the deck) and has 450 hours on the clock. It runs well and was fully serviced according to the two-year checklist immediately before it was transferred to me for domestic use last winter. As a courtesy, the company owner gave me a fill of commercial red diesel before handing it over - about 2/3 of a tank.

The problem for me is that I seem to be pretty sensitive to the exhaust from vehicles using commercial red diesel. I get awful headaches walking alongside a main road with trucks or getting stuck behind one on my motorbike. I used the mower for the first time this week outdoors for one hour and of course it performed perfectly but the next day I was really sick. I had a thumping headache, nausea and upset stomach - all of the symptoms I get from dirty air on the roads.

I mentioned this to the previous owner and he immediately remembered he had given me the red diesel which he called the "rough stuff". Looking up the difference between red diesel and forecourt low sulphur diesel in the UK, it mainly seems to be the sulphur and aromatics that are the issue in the red fuel.

Whatever the substance that is giving me the headaches, the red in the tank has to go. I intend to replace it this time with a quantity of Aspen D (formerly Eco-Par I think?) and see of that makes a difference to my symptoms. I know it is a lot more expensive but the ill effects of using red are just too bad.

I have a suitable fuel container big enough for what remains in the tank and I also have a fuel siphon on the way, arriving this week.

What I would like to do is at least empty the tank as much as the siphon can get to but of course there will be what is remaining in the lines, filter and pump.

This is where I need advice please.

Do I just siphon what I can get out and immediately refill with the clean Aspen diesel?

Should I siphon everything then start the engine outdoors and let it draw all remaining red diesel through until it runs out then refill (and presumably have to bleed)?

I am concerned because although the filter was changed at the service, I don't know the condition of the tank in regards to residual dirt or water. I also don't know how to bleed a GR1600 as it is not really covered in the User Manual.

Thoughts please?
 

thepumpguysc

Member
Aug 8, 2018
267
1
16
Sunny South Carolina
If your machine has an electric supply pump on it.. {u should be able to hear it running when u turn the key "on"}..
Remove the line at the injection pump inlet & w/ a bucket handy, turn the key "on"..
The electric lift/supply pump will pump all/most the fuel out of the tank..
There WILL BE some left over because the pipe isn't all the way to the bottom, for obvious reasons..
Fill w/ your preferred fuel & turn the key back "on".. still w/ the line removed..
The supply pump will refill the filters & expel any air in the lines..
Now reinstall the removed line at the inj. pump inlet & tighten..
Now start the engine at 1/2 throttle<< VERY IMPORTANT.. & let it run until it smooths out..
The fuel left in the pump & lines will be burned out in a jiffy.. & the rest of the fuel in the tank will be thoroughly mixed.. Good luck & where a dust mask when operating your machine..
 

DanielCoffey

New member

Equipment
GR1600-II
Mar 31, 2019
4
0
0
UK, South Ayrshire
Many thanks for the quick reply.

Yes, the GR1600 does have a fuel pump as there is a "tic tic tic" when the key is on the first position.

I will use the siphon to get the bulk of the red diesel out as there is about 9L in there and then I can let the pump piddle out the rest into a tray. I presume I can unclip the fuel line between the pump and the second fuel filter.

I appreciate the tip on starting on half throttle until the air is bled out. That is the sort of thing that is not covered in the manual.

What sort of dust mask do folks use when operating diesel machines? I presume it is the particulates we need to exclude, yes?
 

Jim L.

Active member
Jun 18, 2014
835
115
43
Texas
You should consider a mask made for vapor and aromatics. They have charcoal in the filters. The masks are used for paints, solvents, herbicides, etc.

They are not very expensive and have replaceable filters.