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Author Topic: Symptoms of a fuel filter starting to block.  (Read 70 times)
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« on: 14 January, 2018, 00:47:16 AM »

Just thought I would post this as a bit of advice to newbies who maybe don't have experience of diesels.
Classic 2005 4D56T 115 hp Trojan double cab bought in 2009 with 37k on it - I changed the fuel filter back in late 2009 because I didn't know the service history of the truck.
It's now got 56k on it.
I had been getting signs of the filter starting to block for a month or so -  ie hanging back on hills, not pulling well etc but had ignored it as I am an idle s*d and had loads of other stuff to do (that's my excuse and I'm sticking to it !)
Anyway - today coming back from town, trod on the loud pedal in fifth to accelerate up a long hill and the rpm went up to about 3000 and then stopped there with a jolt like it was on an rpm limiter and then slowly backed off down to 2500- got it back home with no further trouble on a light throttle no fault lights etc.
Aha I thought - it's that bl**dy fuel filter.
So after doing all the chores like bring in the firewood I replaced the damn thing in the freezing cold (+4 C and a keen NE wind)
Easy enough job - I must have replaced hundreds of the things in a previous life on various engines.
I replaced a Fram with a Fram I had in stock for years.
The old filterelement was well black and very heavy compared with the new one.
A bit of a tip - if you are going to keep a filter in stock, take it out of the box and wrap it in cling film to stop it absorbing moisture from the air, if it is kept in a damp shed or garage it will absorb moisture from the air and stop it working effectively.
I notice the Boshi filters have a plastic film  seal on the top, but nothing on the bottom.......!

I reckon that the old filter had about 2750 litres of diesel put through it based on average consumption so I think I got good value from it !

I'm not over the hill. I'm still trying to get up it!
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