Fuel Consumption


Hi everyone, I have noticed in the last few weeks that my fourtrak seems a bit thirsty. I know this is most probably down to the 31/10.5/15 tyres but I wondered if its worth replacing the sensor under the thermostat housing that connects to the injector pump,(choke?), as mine is an '85 but with the cylinder head of a '95, could it be the wrong sensor? Or maybe winding the pump down to use less fuel? Its getting to the point where I feel like crying in the petrol station! As i`m a student it's not very practical any more but i wouldn't give up the fourtrak for the world.
Any help appreciated, Thanks.

Give it a good service, check

Give it a good service, check the tyre pressures regularly and this might sound daft but spend an afternoon with the old t-cut and give it
a right old polish up. This will make a (very small) improvement in wind resistance LOL. Seriously though removing any non essential stuff
like roof racks, bull bars etc and not carrying loads of heavy crap in the vehicle helps a little with mpg.


make sure the air filter is c

make sure the air filter is clean, take the element out brush it off and tap it to disslodge dust from in the filter, a light right foot is good aswell anything over 2 1/2 thousand revs in the gears is just wasting fuel.


Thanks for your suggestions, I`ll give everything a clean and keep your ideas in mind, thankyou all, Mike.

1985 Fourtrak 2.8, Intercooler, 4"Lift, on 31,10.5,15 Grizzly Claws.

1985 Fourtrak 2.8turbo, Spring over axel, on 35,12.5,15s

check your tyre pressures. M

check your tyre pressures. Mine were set in the summer and I noticed a drop in economy with the cold weather. Checked the pressures and they were 4psi lower which I'd guess with the same size of tyres as you adds a load of drag and lowers consumption


these things need to breath - check your exhaust isnt clogged, stick a k&n airfilter on it, carve a 2.5 inch hole in the filter box just below the filter so it doesnt have to drag the air all the way through that inlet duct - i did it to mine and i reckon it imnproved fuel consumption from 27 to 33 mpg.

plus, unless your in a hurry keep the revs between 2000 and 2500 revs max - anything more drinks the gas (on motorways this means you are restricted to under 65 mpg cruising)

i have got several k & n filt

i have got several k & n filters kicking about from my hovercraft engine! can i just take off the big filter box, and fix the filter to the inlet pipe? does it matter what size it is? will it really make a difference to fuel consumption?

does the filter need to be a certain size to allow in the right amount of air?

anyone wana ride in my hovercraft!


I have already fitted a k & N filter to the turbo inlet, as you suggest, I don't think it really makes much difference to economy but makes a nice noise under boost. It might be my imagination but mine seems to pull better from 2 thou than previously pulling more so from 2.5 thou.

1985 Fourtrak 2.8, Intercooler, 4"Lift, on 31,10.5,15 Grizzly Claws.

1985 Fourtrak 2.8turbo, Spring over axel, on 35,12.5,15s