Diesel purge 101

If you haven’t done a diesel purge then I’d recommend it. I was really surprised at the crap that came out of the pump. I hadn’t used a filter on the return line but when I saw what came out I stopped and fitted an inline filter. Surprised too at the heat that built up in the purge “tank”.
I did this on two cars and there was a noticeable improvement on both thanks @depronman !
 
George Hogg said:
If you haven’t done a diesel purge then I’d recommend it. I was really surprised at the crap that came out of the pump. I hadn’t used a filter on the return line but when I saw what came out I stopped and fitted an inline filter. Surprised too at the heat that built up in the purge “tank”.
I did this on two cars and there was a noticeable improvement on both thanks @depronman !
Click to expand...

Yes it bloody good stuff

Paul


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I refill my fuel filter on my A4 with liquid Moly on every filter change. Not sure of any difference to the engine though.
But then I also add 2T oil to my fuel tank at fill ups.
 
Pie-eyedpiper said:
I refill my fuel filter on my A4 with liquid Moly on every filter change. Not sure of any difference to the engine though.
But then I also add 2T oil to my fuel tank at fill ups.
Click to expand...
This is applying it neat in a fuel loop with an inline filter, that makes a difference.
 
Supplying neat diesel purge with a filter on the return line to your diesel purge mini tank works very well. Much better than just dosing the tank.
It gets a surprising amount of crap out of the system and a little in-line filter catches it so you done recirculate it back through the pump.
I didn’t run my tank right down, I took it to about 10miles on the DIS and put 2L of diesel purge in the tank. I deliberately changed the filter before I did this and then again after about 120miles, just to see if it shifted stuff out of the tank. The filter was absolutely covered in muck.

@depronman’s way of doing it will certainly clean everything out though!
 
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George Hogg said:
Supplying neat diesel purge with a filter on the return line to your diesel purge mini tank works very well. Much better than just dosing the tank.
It gets a surprising amount of crap out of the system and a little in-line filter catches it so you done recirculate it back through the pump.
I didn’t run my tank right down, I took it to about 10mins on the DIS and put 2L of diesel purge in the tank. I deliberately changed the filter before I did this and then again after about 120miles, just to see if it shifted stuff out of the tank. The filter was absolute covered in muck.

@depronman’s way of doing it will certainly clean everything out though!
Click to expand...
Mine being a pre-2002 has the canister filter, so I won't get the complete satisfaction of seeing a filthy element though. 😭
 
It is satisfying seeing a crappy new filter but you’ll know your fuel system has been flushed. I pre-changed the filter once, on every other car I’ve only done it post flush.

George
 
In the end I didn't do Paul's method of purge:

Having run my fuel right down to 60 miles past zero miles range, adding the 5l to the tank, running the car to the same level and then filling up with a full tank of branded fuel, I noticed an improvement in running and a slight improvement in fuel consumption.

In my ownership since then I've run the car exclusively on the Millers additive and over time the car has gradually become more and more economical. I think it's now at peak efficiency and high time I changed the fuel filter as it hasn't been done since I bought the car over 20k miles ago.

If I hadn't been so time-poor I would recommend doing it "properly", but it undoubtedly did do some good the way I went about it.
 
Stan H said:
I'm surprised to hear that anyone would want to run their fuel down to the dregs. The reason being that the A2 is not a new vehicle so there is years of all kinds of build up in a tank. I used to work for an independent fuel & oil supplier and we would pick up fuels from Manchester Fuel Terminal (MFT) and Shell Stanlow, Cheshire. There would be Shell tankers before and after our vehicle and the notion of the fuel being different could not be further from the truth, we also loaded up alongside the major supermarket tankers. So again everyone was taking the same fuel to the same specifications.
Shell were a bit naughty as their fuel came out warm from the refinery and cooled overnight. Some fuel stations complained that they we're loosing up to £30K / year due to the specific gravity when sold ment that the temp difference ended up with the load being short.
In winter 200 LTRs of Kerosene would be added to 17,800 LTRs of diesel or as the owners said Winter fuel.
We also stored fuel at our site in silos, but in summer when quiet the silo would be run down and the service plate opened, and here's why you should not run your fuel down to the dregs. You would have to shovel out the algae that had grown in-between the fuel (oil) and water. The water is there from condensation and most A2's have had15-20 years for it to build up in the tank. There was other debris that had got past filters as well another reason not to find down the fuel to nothing.
On the oil side that was similar in that the oil is made to a specification so as long as you go for the same spec you should be OK. I have been using oil from Westway Lubricants in the Midlands and just bout 20 LTRs of the correct spec for one of the cars for £65.
A bit of a story but that's what happened.

Take some photos of before and after of the inline fuel filter when you have done your diesel purge.
Click to expand...
That’s why the filter has a drain valve.
 
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