Injection pump gummed up

[Head Womble]

Mark,

Typlically, how long do you think you leave your bio for before using it?

I know sometimes we're all in a rush, but im wondering if always keeping a batch in hand (for longer settling) may be good.

Anything between 24hrs and a week, depending in need.
But generally at least 48hrs.

[Head Womble]

Wonder if water washing reduces it ... I've only comparatively recently moved to water washing, as has Mark.  Tony to the best of my knowledge doesn't water wash, but may have seen it in transported cubies.

Any long term water washers remember seeing anything similar sitting on top of a filter when changing?

I'm with Julian on this, my gut feeling is water washing will at least reduce this, if not stop it.

Nige, you've allways water washed so it would be good to know if you get any build up in your filters.

[thewormman]

The deposits I removed don't dissolve in methanol, IPA, or break cleaner,
the only thing that had some effect was hot water with washing up liquid, this softened it but did not dissolve it.

So it can't be glyc because that will dissolve in IPA methanol and water.

What does oxidised bio look and act like?

[Head Womble]

The deposits I removed don't dissolve in methanol, IPA, or break cleaner,
the only thing that had some effect was hot water with washing up liquid, this softened it but did not dissolve it.

So it can't be glyc because that will dissolve in IPA methanol and water.

What does oxidised bio look and act like?

Gly in liquid form does yes, but has anyone tried this with solid gly ?

[julianf]

Mark,

Typlically, how long do you think you leave your bio for before using it?

I know sometimes we're all in a rush, but im wondering if always keeping a batch in hand (for longer settling) may be good.

Anything between 24hrs and a week, depending in need.
But generally at least 48hrs.

Im wondering if that may be a bit on the lean side?

Have you ever noticed further drop-out in any fuel that you have canned after the above period, but have left unsused?

I guess a conclusive test might be to fuge a load of your fuel at the point at which you would consider it "fit for punishment" and see if anything more comes out?

[greasemonkey]

Thinking about what the gum is, I look at it this way. IIRC you say the pump has done around 90K on Bio. At an average of 40MPG, that comes out at around 2250 gallons of Bio. If my maths is right, that's over 10K litres.
If 10 % of whatever it is has stayed in the pump, then that is still an incredibly small amount of whatever the gum is. I would suggest, if it is some sort of contaminant, or by product from the reaction, then it could be virtually impossible to detect in a batch.

Of course, if it is Bio changing into something else, then that is a different story altogether.

Another thing, is this gum coming out in a pressurised area of the pump? Could it be something to do with the pressure causing dropout, or somehow altering the state of the bio? 

[Julian]

Thinking about what the gum is, I look at it this way. IIRC you say the pump has done around 90K on Bio. At an average of 40MPG, that comes out at around 2250 gallons of Bio. If my maths is right, that's over 10K litres.
If 10 % of whatever it is has stayed in the pump, then that is still an incredibly small amount of whatever the gum is. I would suggest, if it is some sort of contaminant, or by product from the reaction, then it could be virtually impossible to detect in a batch.

Of course, if it is Bio changing into something else, then that is a different story altogether.

Another thing, is this gum coming out in a pressurised area of the pump? Could it be something to do with the pressure causing dropout, or somehow altering the state of the bio?

Good reasoning there.

But I think with the IP, the areas where the gunk has accumulated are only under lift pump pressure ... I'm sure Mark will know better than me on that score.

[1958steveflying]

I don't have any pics but I took a pump off my camper when I changed engines and the pump was spotless inside. Nowhere near your mileage Mark by a long shot.

  Could the cars filter be the route cause in either letting this gum by in the first place or even be the origin of it ?    After having said that how many filters has it had in this time and was there any evidence of this gum on previous filter changes

[nigelb]

I don't have any pics but I took a pump off my camper when I changed engines and the pump was spotless inside. Nowhere near your mileage Mark by a long shot.

  Could the cars filter be the route cause in either letting this gum by in the first place or even be the origin of it ?    After having said that how many filters has it had in this time and was there any evidence of this gum on previous filter changes

What were your production methods while you had the camper Steve? ie the end bit

[nigelb]

Wonder if water washing reduces it ... I've only comparatively recently moved to water washing, as has Mark.  Tony to the best of my knowledge doesn't water wash, but may have seen it in transported cubies.

Any long term water washers remember seeing anything similar sitting on top of a filter when changing?

I'm with Julian on this, my gut feeling is water washing will at least reduce this, if not stop it.

Nige, you've allways water washed so it would be good to know if you get any build up in your filters.

next filter change I'll take a saw to it and have a look!

[Head Womble]

Yes the only buildup was in the lift pump side, not the high pressure side.

In this time I've gone through a good few filters and most if not all have had some deposits on the top.

Juliaf, my fuel has never sat around for long, a bit hand to mouth really.

[Julian]

Wonder if water washing reduces it ... I've only comparatively recently moved to water washing, as has Mark.  Tony to the best of my knowledge doesn't water wash, but may have seen it in transported cubies.

Any long term water washers remember seeing anything similar sitting on top of a filter when changing?

I'm with Julian on this, my gut feeling is water washing will at least reduce this, if not stop it.

Nige, you've allways water washed so it would be good to know if you get any build up in your filters.

next filter change I'll take a saw to it and have a look!

Probably a different design, but on mine there was no need to cut it up. There's a metal top plate on which the stuff sits ... no more than a millimetre or so thick , but noticeably there.

[Head Womble]

This is the type of fuel filter the 406 uses, the deposits are found on the top of the metal plate.

http://www.ebay.co.uk/itm/Peugeot-205-306-405-406-806-1-9TD-Diesel-Fuel-Filter-/230656893318?pt=UK_CarsParts_Vehicles_CarParts_SM&fits=Model%3A406&hash=item35b438e186

[Head Womble]

I've just checked the last filter I took out my merc (kept as it was not the source of the problem),
and there is no deposits on it, it has only done a few K but I thought it was worth a mention.

I can't remember seeing anything on other filters either.

The pug runs a Bosch VE and the merc has a Bosch in-line pump.

[nigelb]

Mine's one of those spin on types with the water drain hole at the bottom. Cutting it up would be my only option. The one on the golf is sealed with the inlet/oulet pipes built in. Same option there as well.