Vehicle & Technical > Discovery

Getting well narked now.

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marjan:
Mmmm, so much for me saying "get an oversized battery", mine has only just started tonight after being stood since Friday  :shock: :shock: :shock:

stageonesimmo:
If the priming bulb is between the tank and lift pump then it getting crushed is an indication of a good lift pump but a restriction somewhere as its collapsing the supply pipe at the weakest point (the bulb).  It may just be that the bulb is not man enough to cope or it may be that the veg oil is heavier than diesel and the pump is struggling to lift it out of the tank?

Not much good on veg oil - I only use it for chips

muddyjames:
ah, nooo

the priming bulb is in the new diesel line. It is diesel tank in boot-priming bulb-filter-valve-injectors. As I believe it to be anyway. Only the veg oil runs through the lift pump.

So the bulb becoming crushed is a good sign of the engine having enough guts to pull the diesel through under it's own power and not needing a pump? Am I right?

stageonesimmo:
Well, yes and no.......

The bulb collapsing is a sure sign that the FIP is indeed pulling fuel all by itself, but as the bulb collapses it causes a restriction which the FIP will most likely not be able to overcome on its own - the lift pump may well do, but the bulb collapsing is a symptom also of a restriction further up-stream as  if pressure was equal on both sides of it there'd be very little collapsing evident. so I think you have a partial blockage between the bulb and the tank, this results in a depression in the fuel line which manifests itself in crushing at the weakest spot - the bulb.  The up-shot of the whole thing is reduced fuel delivery and poor running/starting as a result.

OR... it could mean that there is air in the pipe downstream from the bulb as air is less dense than fuel, and some scientist may well correct me here, but, this will also allow the pressure to drop in the pipe before the bulb as the volume of fluid in the pipe will drop as air enters it through the leak giving the same overall result as a restriction....

The fact that there is fuel around some of the joints points towards a leak - if fuel is getting out of a pipe subject to a depression, you can bet your arse air is getting sucked in..............

Right, I need to lie down now..............

muddyjames:
right then.

My fact finding so far today. Started disco this morning, gave a few pumps on the loud pedal and it fired up, it ran at more of a sensible tick over speed but still not 100% right. This is the best bit though. It drove and didn't stall!!! Woo hoo.  :dance: Started it after work today and again it was fine.

I do have air in the clear inline filter. I cant shift it though. When I rev the engine there are no air bubbles appearing in the filter like there was a few weeks ago. cuning trick I got shown a few weeks.  :doh:

So blowing the lines back to the tank I think will have cleared any blockage and as the engine is running with no aid of any lift pumps etc I think it will idle slightly slower anyway, but it isnt so low it sounds like a boat chugging along now!

So all in all, progress has been made!

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