jamesledingham Posted January 23, 2007 Share Posted January 23, 2007 I've taken the 90 into the garage today to have the brakes done. I aksed them about the woosh of air I get when I open the diesel cap. They've just told me it's a problem with the diaphragm (sp?) in the fuel injector and that basically I need a new diaphragm as all the turbo is being sent back into the tank and may make the tank explode. Anyone else experienced this? Will it have meant an increase in fuel consumption and decrease in power? Quote Link to comment Share on other sites More sharing options...
Mark90 Posted January 23, 2007 Share Posted January 23, 2007 Is the woosh definately air coming out of the tank? Much more likely is a blocked breather leading to a vacuum in the tank as you use up fuel and the woosh is air going in to the tank. Quote Link to comment Share on other sites More sharing options...
BogMonster Posted January 23, 2007 Share Posted January 23, 2007 What Mark90 said ^^^ Quote Link to comment Share on other sites More sharing options...
jamesledingham Posted January 23, 2007 Author Share Posted January 23, 2007 What Mark90 said ^^^ No - i think it's being sucked instead of blown Quote Link to comment Share on other sites More sharing options...
FridgeFreezer Posted January 23, 2007 Share Posted January 23, 2007 What they said ^^^ the Range does this sometimes, as did both my Nissans and four company vans... the garage are just trying to make money, or very stupid. Quote Link to comment Share on other sites More sharing options...
Mark90 Posted January 23, 2007 Share Posted January 23, 2007 Aye if it's sucking air in it's definately not the turbo pressurising the tank, or some other bull. Blocked breather in filler cap, unless there's so much vacuum you can't get the cap off I wouldn't worry about it. I wish mine was blocked I lose (much needed) petrol when mines on a steep side slope Quote Link to comment Share on other sites More sharing options...
jamesledingham Posted January 23, 2007 Author Share Posted January 23, 2007 I've been down there to see them and they're adament that it's what they said. The diaphragm in the pump. I think it is actually blowing rather than sucking as I've had diesel blown onto me before! Quote Link to comment Share on other sites More sharing options...
T1G UP Posted January 23, 2007 Share Posted January 23, 2007 Am i right in saying that the tank is pressurising? This shoudn't happen because there are breathers that allow the tank to,ahum, "breath" So your breathers are blocked. If theres no detrement to the running then i'd have it back and sort the breather pipe myself. If there is a problem with the running then it could be the pump but i'm not convinced because the fuel return is a gravity system. Quote Link to comment Share on other sites More sharing options...
jamesledingham Posted January 23, 2007 Author Share Posted January 23, 2007 I wouldn't know where to start though and these guys are not going to look at the breather because they say that's not the problem. Also they say that as the tank's pressurising it will go pop at some stage Quote Link to comment Share on other sites More sharing options...
T1G UP Posted January 23, 2007 Share Posted January 23, 2007 Yes the tank will split because the expanding gases have no here to go,hence the breather pipe! Quote Link to comment Share on other sites More sharing options...
jamesledingham Posted January 23, 2007 Author Share Posted January 23, 2007 So the breather breathes in AND out then? Quote Link to comment Share on other sites More sharing options...
Happyoldgit Posted January 23, 2007 Share Posted January 23, 2007 I wouldn't know where to start though and these guys are not going to look at the breather because they say that's not the problem.Also they say that as the tank's pressurising it will go pop at some stage Who's vehicle is this theirs or yours? Tell them you want the breather checked first Quote Link to comment Share on other sites More sharing options...
BogMonster Posted January 23, 2007 Share Posted January 23, 2007 What sort of engine is it - I'm assuming a 300Tdi in what I say here: I may be wrong but I can't immediately see how a leaking 'fram would pressurise the tank anyway. There is no diesel inside the compensator unit on either side of the diaphragm so an increase in pressure inside there wouldn't do anything unless it is blowing through other seals inside the injector pump - and in any case there is a breather pipe out to atmosphere from the bottom side of the diaphragm anyway so excess pressure would vent out through that (little short rubber thing on the back of the pump). Also you would lose LOADS of power if the diaphragm was leaking that badly, and if it was pressurising the fuel lines it would probably also put air into the fuel which would stop the engine.... Lots of reasons why I regret to advise I think they are talking blx Quote Link to comment Share on other sites More sharing options...
white90 Posted January 23, 2007 Share Posted January 23, 2007 get a new fuel cap and try that the breather is in the cap itself. http://forums.lr4x4.com/index.php?showtopi...20cap&st=20 Quote Link to comment Share on other sites More sharing options...
Matt Neale Posted January 23, 2007 Share Posted January 23, 2007 Actually, I'm not convinced that they are talking bull. I've heard of this before - it's peculiar to the TD engine - and in fact used to happen on my own 110 when I had the TD fitted. The fuel tank pressurises and blows fuel out from around the breather in the cap - there is a definate blowby when the fuel cap is removed. It no longer happens now I have a TDI but I do recall seeing a thread about this same thing on this forum some time ago - just can't find it at the mo. There was a mention of a diaphram in the fuel (injector) pump being the cause - and a rebuilt pump being the solution. If I can find it later I'll put up a link. Matt Quote Link to comment Share on other sites More sharing options...
white90 Posted January 23, 2007 Share Posted January 23, 2007 what engine is fitted please Quote Link to comment Share on other sites More sharing options...
white90 Posted January 23, 2007 Share Posted January 23, 2007 1990 Pickup cab only has the 1990 2.5 TD? Quote Link to comment Share on other sites More sharing options...
jamesledingham Posted January 23, 2007 Author Share Posted January 23, 2007 1990 Pickup cab only has the 19902.5 TD? 2.5TD Quote Link to comment Share on other sites More sharing options...
BogMonster Posted January 23, 2007 Share Posted January 23, 2007 2.5TD OK well I don't know the internal plumbing of a TD injector pump, it may be different to a 300Tdi so what I said above may not apply. Quote Link to comment Share on other sites More sharing options...
Phil Hancock Posted January 23, 2007 Share Posted January 23, 2007 On TD injector pump, if the boost valve diaphragm has got a leak it will presurise the tank to some degree as the diesel return line to the tank is on the opposite side of the diaphragm to the boost air. With a bit of care the diaphragm can be changed without taking the pump off. Quote Link to comment Share on other sites More sharing options...
BogMonster Posted January 23, 2007 Share Posted January 23, 2007 On TD injector pump, if the boost valve diaphragm has got a leak it will presurise the tank to some degree as the diesel return line to the tank is on the opposite side of the diaphragm to the boost air. With a bit of care the diaphragm can be changed without taking the pump off. What a stupid design! :rolleyes: Quote Link to comment Share on other sites More sharing options...
Andy Posted January 23, 2007 Share Posted January 23, 2007 What a stupid design! :rolleyes: is TDs in general or just the pump? Quote Link to comment Share on other sites More sharing options...
Turbocharger Posted January 23, 2007 Share Posted January 23, 2007 I'll be in Stroud on Sunday if you want a swapsie fuel cap to experiment with. In fact I suspect if you PM TroddenMasses and offer wine or beer he might lend you one on a longer term to supplement his alcohol habit Quote Link to comment Share on other sites More sharing options...
LS26 Posted January 24, 2007 Share Posted January 24, 2007 I'll be in Stroud on Sunday if you want a swapsie fuel cap to experiment with. In fact I suspect if you PM TroddenMasses and offer wine or beer he might lend you one on a longer term to supplement his alcohol habit Even if there is some problem with the injector pump, surely the first line of attack (and the cheapest) is to deal with the breather which is presumably blocked otherwise it would capable of venting the extra air? And if the breather IS blocked then it is not also possible that temperature changes could cause the tank to get pressurised/evacuated? Rog Quote Link to comment Share on other sites More sharing options...
BogMonster Posted January 24, 2007 Share Posted January 24, 2007 is TDs in general or just the pump? Both, but on this occasion I was thinking about the pump Quote Link to comment Share on other sites More sharing options...
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