Hi , I sorted the starting problem on my Defender 300tdi with the addition of a new lift pump . It'll tick over ok but increasing the revs causes it to starve and bog down . The filter is new and all hoses and connections are clear . Timing is spot on and there's no smoke . Injector connections were cracked off one at a time and no air bubbles . Since the pump was now primed I removed the inlet hose at the filter and stuck it in a jar of diesel . It started up straight away but the same problem persisted . No fuel was drawn from the jar and no fuel came out of the return pipe during this test . So , is my injection pump phucked ?
Maybe. On a 200tdi you can block off the fuel pipe from tank to lift pump and it will start and tickover but won't really drive.
Sounds similar to your problem but if you have checked you have a good supply of fuel then maybe it is the injection pump?
I am absolutely no expert but can't really see what else it can be in the fuel system..
Sounds similar to your problem but if you have checked you have a good supply of fuel then maybe it is the injection pump?
I am absolutely no expert but can't really see what else it can be in the fuel system..
Phill
Active Member
I had a similar problem a couple of years ago, so fitted a facet pump on the chassis to do the heavy lifting to the diesel pump. Never had a problem since. A new pump was about 600 at the time.
There's a few models on Tweeks site, but this is the one I use.
There's a few models on Tweeks site, but this is the one I use.
Thanks for that but since the brand new lift pump is pumping well that wouldn't be the issue here . A Bosch VE injection pump is fully capable of sucking diesel direct from a tank without a lift pump in between .. in fact that is what this pump has been doing for the last eight years as the lift pump is reserved for shifting the heavier veg/diesel/petrol blend from a second tank .
Only to check and replace them one at a time after the fault occurred , so no mix ups .
well in that case I think your first diagnosis might be correct.
I am not sure where the vane pump is the VE pump and whether it is a DIY job or not?
if I remember correctly the internal pressure in the VE pump is something like 70 psi, so it might be worth trying the earlier suggestion of using a copy facet pumps of eBay, I think they are under 20 quid, so could be worth it as a test before you spend proper money on a injection pump?
There is something I will look at first . There have been reports of similar symptoms from a stuck boost pin . If a fully primed Bosch VE is depending on fuel being pushed into it to function then there is something wrong with it , the only question is what .. won't be today though , miserable weather here .
D1Nut
Well-Known Member
When you say it rev's a bit then "bogs down"
Does that mean it sounds like it's missing but the revs are higher than idle speed or does it return to idle speed and idles nicely.
Cause that could be the governor acting up as well. Not sure if throwing some injector cleaner thru the system would harm anything and certainly cheaper than getting the pump redone
Also will she idle for say 30 min's on her own and then when nice and warm see if the results are the same
Does that mean it sounds like it's missing but the revs are higher than idle speed or does it return to idle speed and idles nicely.
Cause that could be the governor acting up as well. Not sure if throwing some injector cleaner thru the system would harm anything and certainly cheaper than getting the pump redone
Also will she idle for say 30 min's on her own and then when nice and warm see if the results are the same
Hi , no , if you operate the throttle it will increase the revs up to the point where it starves of fuel then you will hear it go quieter and slow down . As that is happening the fuel coming out of the return will trail off . The only reason it's starting and running now is the new lift pump is feeding it sufficiently to start and run , after a fashion . The real question at this point is why the injection pump is not drawing in fuel of its own accord . I hope to check the fuel pin tomorrow , weather permitting .
Hicap phill
Well-Known Member
My 200 does not have the mech lift pump. It runs an electric pump(110 v8 petrol 1985)
Now fun bit… my motor will run without this pump been turned on,happily sit at 60mph for over an hour & not show any signs of restrictions. I know this as the mrs forgets to turn the pump on when she nicks it.
Turn pump on no noticeable diffence
My 200 has a cheap facet copy pump off ebay, starts and runs just fine without it, but I can notice a power loss up long hills if not switched on.
I think the lr mech lift pump is fine when working, but when it pack s up it actually causes a restriction to the fuel supply.
Quite a few cars used the ve pump with no extra lift pump, just relying on the ve inbuilt vane pump to do the work.
