Forum:
Ok, I've been running my tonka on biodiesel and it's been running great, last week their pump broke and I couldn't get any 
Put some normal diesel in and although it ran it was a bit 'rattly' (as per pre using biodiesel).
Spoke to a garage about it and they said that adding veg oil to the diesel would help it run better and would be ok - so like a pillock I did (brand new veg oil, not old stuff - about 70% diesel to 30% veg oil)..........
Vehicle actually ran well for 1st couple of days - now it turns over but won't start
Problems started when it got much colder out - I'm guessing that this is a fairly big part of the problem.
Have drained tank completely and put in 10l diesel, but still no joy.
Have also replaced the glow plugs (they were old anyway).
I'm guessing that I'll now need to drain system and replace filters - help! Don't know how to do it!
Only had the tonka a short while and need some guidance please 
Any fourtrak techies near Pontypool who can come out to me please?
I can be contacted on 07977 038299 (easier than home phone cos I'll probably be out with the car anyway!)
'93 Fourtrak 2.8TDL Hi I've
'93 Fourtrak 2.8TDL
Hi I've been saying for a while now that I was going to start using a 50/50 derv/veg oil mix... just haven't got round to doing it yet. Apparently the thing to look out for is that veg/sunflower oil is very good at cleaning the shit out of tank/pipes/etc., & depositing it all in the fuel filter, which is the thing towards the bulkhead, left hand side, with a "push button thingy" arrangement on top; it unscrews (if memory serves) & filter kits are £10 from Milners if you're thinking of replacing. There are I think numerous posts on this subject, but the effects of using veg after biodiesel I know nothing about(if indeed there are any "effects" good or bad).
"ews" & "svoburner" are 2 people that spring to mind straight away re. veg oil, so it may be worth doing a site search; removing & changing filters is something even I can do, so it should hold no fear for anyone!
Good luck & I hope that this waffle is of some use to you.
Regards
MJ
'93 Fourtrak 2.8TDL
yes just change fuel filter
yes just change fuel filter should then be ok ive now just started to run 100% oil now weather is starting to warm up with no probs but thats me mine is 97 indy it seems to go better than on derv but try at your own risk !
The Unknown
Many problems are prevelent with running bio diesel, i have listed them in a previous post on the subject.
Begin by changing the fuel filter, the cold weather can cause this stuff to coagulate and block everything from the filter to the injection pump, bleed this through thoroughly with clean diesel.
Check for voltage at the fuel shut off valve, if this is ok then get someone to crank the engine, crack an injector union at the injector end and ensure fuel is reaching the injectors at pressure, and adequate flow.
If you have flow at the injectors, remove the injectors and bend the pipes carefully and refit the injectors, place glass jars under them and get your assistant to crank the engine again, watch the quantity and spray patterns of each injector. If these are all equal and OK, it is most likely an engine problem.
If you have fuel at the filter and none at the injectors it will be one of the following:
1/ Fuel shut off valve faulty.
2/ Damage within the internal workings of the fuel injection pump, bio diesel and all the variants such as rapeseed oil cause this. Internal seals are not designed to cope with this, they rely upon diesel fuel for their lubrication, alternative fuels do not give adequate lubrication. Clearances within the pump are not designed for these alternative fuels, it is possible that lack of lubrication has affected the fine tolerances.
3 / As you suggest, the pump may have become blocked with debris, congealed fuel, or a combination of the two.
As a final thought, Bio Diesel for use in vehicles is set at 5% in Europe, modern common rail, ECU controlled diesel engines are designed with ECU programmes; to cope with these fuels by altering the engine operating parameters to cope effectively. Daihatsu Fourtrak diesels are basic simple as sin diesels which are not designed to run on these fuels.