mad1 Posted February 23, 2014 Report Share Posted February 23, 2014 Hi all what the symptoms of a poorly lift pump .... Iv got a donor discovery but when revved after about 15/30 seconds it's goes "lumpy" on tick over ?? Is the poss due to lift pump Any ideas before I take it into garage to get fitted into my 110 Cheers M1 Ps where's the best place to get a new one if needed ... Quote Link to comment Share on other sites More sharing options...
ferguson_tom Posted February 23, 2014 Report Share Posted February 23, 2014 Normally just generally sluggish, not getting enough fuel in quick enough basically. Could be a blocked fuel filter or similar, there is a water trap near the fuel tank and if this is limiting the flow it could be revving fine burning fuel in the line further down then the filter is blocking the flow so hence why it goes lumpy. Are you asking so to test the engine before it gets swapped into your 110? if so i would get a new lift pump fitted its only a few easy to get to bolts, then take the hose off between the pump and the filter assy and put it straight in a jug of diesel this way your removing all the variables of blocked filters etc. Quote Link to comment Share on other sites More sharing options...
mad1 Posted February 23, 2014 Author Report Share Posted February 23, 2014 Yes I'm going to give it a service before it gets transplanted so I know it's running so it's a fuel .oil air filters and a new lift pump .... Is there supposed to be much resistance when priming with the lever cos these very little on mine ? Thanks in advance Quote Link to comment Share on other sites More sharing options...
landy george Posted February 24, 2014 Report Share Posted February 24, 2014 Crank it over a couple of times, it works off a gear which need to be in the right place. Quote Link to comment Share on other sites More sharing options...
FatherandSon Posted February 24, 2014 Report Share Posted February 24, 2014 When my lift pump went I couldnt pump it by hand. The lever just felt sloppy Quote Link to comment Share on other sites More sharing options...
aga man Posted February 24, 2014 Report Share Posted February 24, 2014 if you doubt the lift pump then just simply replace it, not big money and as said easy to get to. you can find them on fleabay or rimmerbros etc. i would say it's goosed if the lever is floppy with little resistance. Quote Link to comment Share on other sites More sharing options...
Paul223 Posted February 24, 2014 Report Share Posted February 24, 2014 The lift pump works off a lobe on the cam shaft, when the lube is in position to actuate the lift pump then the lift pump primer will be floppy, turning the engine one complete revolution should see the lobe in the 'off' spot, if not try another half rev Personally I'd adapt the tank to filter pipe to run out of a Jerry can, fit a new fuel filter and run from the Jerry can in the engine bay as discos have issues with tank stack pipes, the bends at the top of the fuel sender unit rotting through and the water trap, a Jerry can will rule these out ASAP Quote Link to comment Share on other sites More sharing options...
mad1 Posted February 24, 2014 Author Report Share Posted February 24, 2014 How do I adapt it to run from jerry can ... Which side is the fuel inlet ( from engine bay ) does it go to prime pump or filter first Quote Link to comment Share on other sites More sharing options...
Paul223 Posted February 24, 2014 Report Share Posted February 24, 2014 It should come from tank to lift pump to filter to injection pump Follow pipe from lift pump down chassis, cut somewhere accessible to repair with some rubber pipe if you need to use on road later, but long enough to pull back to engine bay to loop in to jerry can Quote Link to comment Share on other sites More sharing options...
mad1 Posted February 24, 2014 Author Report Share Posted February 24, 2014 Thanks for that Paul I'll try it in morn :-) Quote Link to comment Share on other sites More sharing options...
archiebald Posted February 24, 2014 Report Share Posted February 24, 2014 I'd order a new filter (£5) and a lift pump (£19) its easy to change the lift pump -2 bolts and some pipes to screw in. Mine wouldn't hand prime so I unscrewed the filter back off and poured in some fresh diesel and then screwed it back on (primed it) then she fired up and run perfect. My 90 had the previous sy?mptoms you describe and since changing these has run perfect! Let us know you get on! Quote Link to comment Share on other sites More sharing options...
mad1 Posted February 27, 2014 Author Report Share Posted February 27, 2014 Just a update: The new fuel filter turned up today so it was swapped over and I also noticed one of the leak back pipes was perished so they were changed too ....I got it started and it still hesitated when pushed to about 2k revs ?? So I am still waiting on the new lift pump to turn up then that will be changed too .... It's def a fuel related prob cos soon as it pushed to 2k revs it's hesitates and goes lumpy ? But if you quickly lift of the accelerator it will eventually sort it's self out and tick over smooth again as if it's fuel starvation? So not great news yet but at least I'm ruling out what it's not Cheers all M1 Quote Link to comment Share on other sites More sharing options...
ditchman Posted February 27, 2014 Report Share Posted February 27, 2014 when the lift pump comes it will come with extra screws and adaptors , pump extention piece, gasket........make sure you use the right fitments as the lift arm will not sit on the cam otherwise and when i got mine the screws were a different thread...so when you take it off DONT throw anything away.............. Quote Link to comment Share on other sites More sharing options...
Paul223 Posted February 27, 2014 Report Share Posted February 27, 2014 Rule out corroded pipes first, such a common problem! Quote Link to comment Share on other sites More sharing options...
ditchman Posted February 27, 2014 Report Share Posted February 27, 2014 Just a update: The new fuel filter turned up today so it was swapped over and I also noticed one of the leak back pipes was perished so they were changed too ....I got it started and it still hesitated when pushed to about 2k revs ?? So I am still waiting on the new lift pump to turn up then that will be changed too .... It's def a fuel related prob cos soon as it pushed to 2k revs it's hesitates and goes lumpy ? But if you quickly lift of the accelerator it will eventually sort it's self out and tick over smooth again as if it's fuel starvation? So not great news yet but at least I'm ruling out what it's not Cheers all M1 sometimes when i have fitted a new filter i have found 2 "o" rings in the top recess one of which is twisted.....when you fit the new filter get a awl or something pointy and check there isnt another "o" ring in the top recess before you fit the new "o" ring Quote Link to comment Share on other sites More sharing options...
mad1 Posted February 27, 2014 Author Report Share Posted February 27, 2014 Rule out corroded pipes first, such a common problem!Do you mean by using the jerry can method ... Also where is the sedimentor ?? And filter in banjo ?? Would these interfere ??Cheers M1 Quote Link to comment Share on other sites More sharing options...
Paul223 Posted February 27, 2014 Report Share Posted February 27, 2014 Yeah plum it to a jerry can Sediment / water trap on inside of right hand chassis rail level with rear diff flange The jerry can will eliminate both the trap and possible corroded tank pipes The other option for this would be to fit a section of clear pipe between filter and injection pump and then view the fuel looking for air bubbles as you lift the revs, and if air is present, doing the same on the fuel feed to lift pump pipe to see if the air is present in the fuel feed, if so suspect tank pipes / trap, if not suspect filter / lift pump / connections Quote Link to comment Share on other sites More sharing options...
mad1 Posted February 28, 2014 Author Report Share Posted February 28, 2014 Right lads new update .... The lift pump still isn't here but I cleaned the banjo bolts the return filtered one was blocked ?? I found the sedimentor and to be honest it fell to bits when I tryed to clean and remove it so iv just bypassed it ?!? After re bleeding it it fired straight up but it took quite a while to bleed ....so am I right in thinking the air leak is between tank and lift pump ? I'm not to concerned if it's a split in pipe as the engine is coming out and all that pipe will be replaced ..so fingers crossed it was just the **** pipe work from tank I'll post any results from changing pump as it's due tomorrow !!! Ps the pipes on top of pump are really tight could I just cut and replace them so I can get socket on or are they a flange type end on pipe ( like brake pipe style ) Again many thanks Ps I noticed the engine run rev really cleanly when the bleed screw was slightly cracked open ?? M1 Quote Link to comment Share on other sites More sharing options...
Paul223 Posted February 28, 2014 Report Share Posted February 28, 2014 Some time soon you'll take some advice from a guy who's been working on them for 25 years this November and run it out if a jerry can or run it with some clear hose! Quote Link to comment Share on other sites More sharing options...
88b Posted February 28, 2014 Report Share Posted February 28, 2014 Some time soon you'll take some advice from a guy who's been working on them for 25 years this November and run it out if a jerry can or run it with some clear hose! Paul sometimes you can't help those who won't listen. Quote Link to comment Share on other sites More sharing options...
mad1 Posted February 28, 2014 Author Report Share Posted February 28, 2014 Lol no it's nothing personnel m8 it's just inside a barn and I need it running enough to get it out into daylight I'm on nights again tonight so I'll get some clear pipe and get it sorted .., Cheers M1 Quote Link to comment Share on other sites More sharing options...
mad1 Posted March 7, 2014 Author Report Share Posted March 7, 2014 Right it's sorted !! I changed a section from the tank to pump and yes there is bubbles shown but only when revved ? So it's obviously from the stack pipe side ? But seen as I'm not putting disco tank and pipe work into defender I'm not going to bother fixing it as it's coming back out in a month or so time ( if that makes sence ) the lift pump turned up is I also changed that ( not 100% on last one working properly ) Right next question iv cleaned the intercooler out and it was black and slimey with oil ! Is it worth altering the actuator arm and doing the pump changes or does it not really give you much improvement ?? I'm not after a hot hatch drive just a bit more go when I need it !! Cheers again M1 Quote Link to comment Share on other sites More sharing options...
ditchman Posted March 8, 2014 Report Share Posted March 8, 2014 if the intercooler was oily it is proberly one of 4 things rings need doing.......the engine is breathing heavy turbo seals need doing air filter needs replacing boost diaphrapm in injector pump has rotted out wouldnt play with the actuator-waste gate...because then you will have to alter the injector pump....its set to give you the optimun in all ranges...so i suggest leave it...cant see the point in trying to get more of an engine than its design limits.... its like shooting a 20 bore with maximum load......you might as well buy a 16 bore and use a normal load Quote Link to comment Share on other sites More sharing options...
mad1 Posted March 9, 2014 Author Report Share Posted March 9, 2014 Brilliant ... Thanks for the replys I really appreciate it :-) M1 Quote Link to comment Share on other sites More sharing options...
Paul223 Posted March 9, 2014 Report Share Posted March 9, 2014 Every vehicle will have some cack in the intercooler, it's inevitable, al engines breath a little, a new engine will breath more than a run in engine, and in this there will always be traces of hot oil vapour, that vapour will condense when it meets the intercooler, and after many thousands of miles will look like a thick stogy oil deposit Give it a wash through with some paraffin then leave it to dry, it'll be fine Quote Link to comment Share on other sites More sharing options...
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