Would seem consistent with dirt interoduced from your jerrycan, though air in the system would probably be easier to deal with so you should investigate that first, working along the system and cracking unions until bubbles stop coming out.

You could then try backflushing the fuel filter with a hypodermic syringe.

When I've done this, I used water with a bit of detergent initially, then 75% ethanol, then 93 (the azeotrope, or strongest you can generally buy) then air dry. I got quite a lot of rust out.. You cant back flush with a hypodermic with petrol or diesel because it destroys the syringe piston rubber.

Alternatively you could just fit a new fuel filter, since it might not be easy to find these materials (readily available in Taiwan) in The Yook, where pharacists seem to go all shifty when asked for them.

However, if there is contamination, it is now in your fuel tank, and the flushed or renewed filter might re-clog rapidly.

I would try and avoid this diagnostically by rigging a temporary fuel supply from a small easily cleaned tank, can or bottle, perhaps gravity fed.

tw.forumosa.com/t/fuel-on-the-roof/182822

In Taiwan, where they are readily available,I might use an enema syringe barrel, since I have some for brake flushing, and these have an outlet conveniently at the bottom. In The Yook they can be ordered via the Internyet.

If this works, it would be advisable to empty and flush out your fuel tank, though this might not be easy if it doesn't have a drain plug, which most dont.

It is possible that your contamination is free water rather than solid dirt, in which case it might be cleared by adding a little alcohol to your fuel, which will act as a bridging solvent and carry it through to be burned. This works with petrol but I'm not sure about diesel so I would test whether ethanol mixes with it first.

Contemporary diesel is also reported to have biodegradability issues, so once a tank is contaminated, that contamination might be self-propagating. Fossils aint what they used to be.

Unfortunately it is also possible that contamination has got through to your injectors and clogged them. If that has not happened already, it is important to avoid it while investigating your problem, so simply removing a clogged filter can not be recommended as a diagnostic procedure, though it could work

Edited by edlithgow on 27/01/2025 at 03:17