disco_al Posted January 8, 2010 Share Posted January 8, 2010 This is a perplexing one. Mate's Defender 90 fitted with a Disco 200tdi lump has lost power, we have replaced the fuel filter and the lift pump, but this has not solved the problem. The symptoms are that it will start and run, it will drive up the road about 200 yards, and then it loses all power, similar to a lift pump fail, nothing but tickover available, not even foot flat to the floor. The fuel lines are clear, the tank looks clean (the pick up pipe was removed and cleaned yesterday) and the filter is new. When the lift pump was replaced last, the new one came with a spacer block, this was intially fitted, but then removed as the cam wasn't operating the rod, without the spacer, the pump operates fine. We also have a clear inline filter fitted, and you can see the fuel pumping into this, however, when you drivbe it up the road, it goes fine, then loses all power. Any ideas guys n gals???? Quote Link to comment Share on other sites More sharing options...
markyboy Posted January 8, 2010 Share Posted January 8, 2010 This is a perplexing one. Mate's Defender 90 fitted with a Disco 200tdi lump has lost power, we have replaced the fuel filter and the lift pump, but this has not solved the problem. The symptoms are that it will start and run, it will drive up the road about 200 yards, and then it loses all power, similar to a lift pump fail, nothing but tickover available, not even foot flat to the floor. The fuel lines are clear, the tank looks clean (the pick up pipe was removed and cleaned yesterday) and the filter is new. When the lift pump was replaced last, the new one came with a spacer block, this was intially fitted, but then removed as the cam wasn't operating the rod, without the spacer, the pump operates fine. We also have a clear inline filter fitted, and you can see the fuel pumping into this, however, when you drivbe it up the road, it goes fine, then loses all power. Any ideas guys n gals???? Certainly sounds like a fuel issue. Is there any smoke present when the engine loses power? How long before the power comes back, if at all? Sounds like it could be the injection pump. When it loses power try cracking an injector pipe off to check for the presence of fuel at the injector. HTH Mark. Quote Link to comment Share on other sites More sharing options...
disco_al Posted January 8, 2010 Author Share Posted January 8, 2010 all we could see last night as it was sat on the drive, was some white ish smoke from the exhaust, which i assumed was from the fact that it was cold. not noticed anything from the exhaust when the power is lost though, it was too cold and dark, will have to have a look in the daylight tomorrow. Quote Link to comment Share on other sites More sharing options...
JST Posted January 8, 2010 Share Posted January 8, 2010 was it converted from a petrol and if so is there limited fuel in the tank? ie 1/4 or less? Quote Link to comment Share on other sites More sharing options...
disco_al Posted January 8, 2010 Author Share Posted January 8, 2010 no, it was a 2.5 n/a before, and there is 3/4 of a tank of diesel in there. Quote Link to comment Share on other sites More sharing options...
GBMUD Posted January 8, 2010 Share Posted January 8, 2010 Is it still returning plenty of fuel to the tank even when it will not rev? Is the return piped all the way back to the tank? How can you see fuel flowing in your pipe? - there should not be bubbles or any other way of seeing fuel flow. Chris Quote Link to comment Share on other sites More sharing options...
gaz0203 Posted January 8, 2010 Share Posted January 8, 2010 try removing the fuel cap, ive had this before when the cap blocked and the tank coudnt breathe Quote Link to comment Share on other sites More sharing options...
cackshifter Posted January 8, 2010 Share Posted January 8, 2010 If that is the case I've seen tanks that have collapsed with the vacuum from a blocked breather. You could hear it as a whoosh when you take the cap off. Having said that I doubt a Land Rover has enough suck to do any damage. Nigel Quote Link to comment Share on other sites More sharing options...
defender dave Posted January 8, 2010 Share Posted January 8, 2010 hi my friend just had the same prob with his disco is was the fuel cap blocked up. worth just undoing it for a try Quote Link to comment Share on other sites More sharing options...
reb78 Posted January 8, 2010 Share Posted January 8, 2010 Pretty sure the last three suggestions are often related to a split boost diaphragm. Whilst this would explain poor performance, it doesnt explain failure to rev at all under no boost conditions etc... Quote Link to comment Share on other sites More sharing options...
gaz0203 Posted January 8, 2010 Share Posted January 8, 2010 yes it does,, when theres vacuum in the tank it makes it increasingly hard for the engine to get the fuel it needs. it will cause exactly the symptoms described. trust me ive had it al before Quote Link to comment Share on other sites More sharing options...
reb78 Posted January 8, 2010 Share Posted January 8, 2010 yes it does,, when theres vacuum in the tank it makes it increasingly hard for the engine to get the fuel it needs. it will cause exactly the symptoms described. trust me ive had it al before After 200 yards i doubt the vaccum would be enough to limit flow. However, I'm kinda wrong - split boost diaphragm would pressurise the tank causing a woosh when the cap is opened and pressure is released. Still not sure that a blocked breather would cause enough of a vaccum to limit flow after 200 yards though, having said that - taking the cap apart and cleaning the breather is a quick thing to do and wont cost anything. Quote Link to comment Share on other sites More sharing options...
disco_al Posted January 9, 2010 Author Share Posted January 9, 2010 well, it's not the filler cap. he has taken it off and driven it up the road, and experienced the same symptoms. Quote Link to comment Share on other sites More sharing options...
LandyManLuke Posted January 9, 2010 Share Posted January 9, 2010 Will it run properly off a tank of fuel strapped to the wing? Is it possible that the second lift pump is also duff? Quote Link to comment Share on other sites More sharing options...
western Posted January 9, 2010 Share Posted January 9, 2010 have a work through this fault diagnosis chart diesel fault diagnosis chart.pdf Quote Link to comment Share on other sites More sharing options...
darthdicky Posted January 9, 2010 Share Posted January 9, 2010 was it converted from a petrol and if so is there limited fuel in the tank? ie 1/4 or less? James, is there a common problem with this? Mine has stuttered a few times when low on fuel but I put it down to only having a litre or two of diesel left... Quote Link to comment Share on other sites More sharing options...
disco_al Posted January 11, 2010 Author Share Posted January 11, 2010 problem solved. the fuel supply pipe into the lift pump wasn't sealing properly, letting air into the fuel system when under load. new fuel pipe fitted and problem gone cheers all for the ideas and pointers. Quote Link to comment Share on other sites More sharing options...
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