Fueling issues?

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gR@HaM

gR@HaM

Well-Known Member
Posts
1,095
Location
Cheshire
Hi, not sure where my none starter is due to lack of fuel as have had the tank out for a long period of time and changedfuel filter, skimmed the head.
Just tried following the diesel priming method in haynes and 1/2 an hour of pumping by hand has still not released anything from top bleed screw.
Am I doing anything wrong??! Thanks
 
If the engine is in the wrong position then the lever on the lift pump wont do anything, you could try turning the engine over half a turn and trying again. Or crack an injector pipe and spin the engine on the starter to see if any fuel comes out
 
Thanks.
Had turned the engine over in order to get the most amount of action out of the pump but nothing.
Also lifting all the injector pipes resulted in no fuel whilst turning engine over.
Have just pulled out the fuel line running from the tank to find still no fuel between the tank and sedimenter. Syringes as much diesel in as I could not sure whether it will help..
 
Between the tank and the filter's sedimenter there is the fuel lift pump

Are U sure that the fuel lift pump is really and truly "lifting" the fuel ?
 
Nope I'm not even sure the pump fuel pump itself is working although it does make a buzzing sound.
Thing is the engine was running fine except for blown HG so don't know what could have changed..
 
Make certain that the pipe from tank to lift pump isnt clogged....... after that check the exit from the pump........pumps use to block if they are not used for longer periods and the buzzing means that they get voltage but are'nt able to reach the desirable rpm or even turn.
 
sierrafery said:
...the buzzing means that they get voltage but are'nt able to reach the desirable rpm or even turn....
Click to expand...

We are talking about a 300TDI aren't we? If so there is no electric pump. There is the lift pump which the OP has tried and not any pumping action from and there is the fuel injection pump. This has a fuel stop solonoid, which should have 12v to when the ignition is on. If it is this that is buzzing then may be its not opening so no fuel is getting to the injectors.

You could remove the outlet from the lift pump and stand it in a can of desiel, if then engine still wont start then the problem is up stream of the lift pump, may be the fuel stop solonoid, try removing that and seeing what's what.
 
Great, thanks both for the advice :)
since my last post have made a bit of progress, after syringing as much diesel into tank end and the fuel filter there was still no diesel coming out of any of the injector feeds and was getting nowhere when pumping by hand.
I then disconnected the feed to lift pump, attached a section of hose and had a good suck! Can definitely confirm that diesel is available - and no matter how many chillis I've eaten since can't get rid of the taste of diesel!

photo-9.jpg


Have now removed the lift pump, all looks mechanically sound although when hooking up to some clear tubing and a sink full of water there was no suction whatsoever:
photo-10.jpg


The plan for tomorrow is to get hold of a new lift pump, plug it in and check for any diesel coming directly out of it. Will do this by leaving the output disconnected and turning engine over by connecting starter solenoid direct to +ve terminal, I guess there is no need to turn it via ignition.
If diesel is being shifted next step to see if the fuel pump is supplying to the injectors by disconnecting the feed pipes.

Sound like a plan?? :)
 
Last edited:
Richard Martin said:
..fuel stop solonoid, which should have 12v to when the ignition is on. If it is this that is buzzing then may be its not opening so no fuel is getting to the injectors.
..may be the fuel stop solonoid, try removing that and seeing what's what.
Click to expand...

is this the small block which is screwed into the outside of the injector pump, fed by a seperate black&white thin wire? Looks similar to the oil pressure switch? Just so I know what we're talking about. May buy a new one anyway if they are cheap and it's a straight swap..
 
gR@HaM said:
Thanks, saw that a while ago but was hoping that mine doesn't have spyder unit! :)

To confirm, I am okay to send 12v to this:
Famous Four - Part Information for FF001281

sorry to be a PITA but don't want to cause any further damage :)
Click to expand...


Other than the fact that the one you highlighted is actually for a TDi 200, yes, that is a fuel stop solenoid. It needs to have 12v to open it and allow fuel to flow.
 
3hrs out in the rain, damn thing still won't start.
After fitting a new lift pump I didn't seem to be getting anywhere pumping by hand, so rigged the pump feed pipe to a 20L drum with diesel in (taped up to make as air tight as possible). It took a long time to purge past the fuel filter but I used clear pipe so at least I could see what was going on.
I then fitted a new fuel stop switch and fed a permanant live to +ve on the battery.
With all 4 injector feed pipes disconnected there's was STILL no fuel coming out of them!
 
Nope, do you think anything could cause it to change when doing a HG job though? It was firing up fine before hand.
Am giving the battery a good charge over night (again)
thanks
 
if you havent had the cambelt off then no it shouldnt of just changed. so to make things clearer, we have fuel the the sedimenter underneath,we have fuel at the top of the pipe leading from the sedimenter to the lift pump on the side of the engine,
next question. take the pipe off the leads from the lift pump to the filter housing, then get pumping on the lever,again if no resistance turn the engine over a little until you do get resistance ,if all okay you should get fuel out. if not then i would check for air leaks on the top of the sender unit under the access panel in the boot!! if you do have fuel,then reconnect the pipe from the lift pump to the fuel filter,and remove the bolt securing it to the filter housing,see if you have fuel from the end of that pipe, if not then the problem is blocked pipe, if you so then put the hose and banjo bolt back in,remove the fuel filter and pump againmsee if you get fuel out of the bottom of the housing,if not then problem is a blocked banjo bolt into the filter housing, if you have fuel the refit the filter, take the bleed screw alll the way out,and get pumping untill you have clean air free fuel flowing,refit the screw then remove the pump end of the pipe that leads from the filter housing to the injection pump, again pump the lift lever and se if you get fuel,if so,clean the hole in the centre of the banjo bolt and refit,then remove the tops of the injectors pipes ( where the unions screw onto the injectors) then ensure you have 12v + feed to the fuel cut of solenoid. then crank it over untill you get fuel. if you still have no fuel from the injector pipes but have fuel to the injector pump then your problem is a dodgy fuel cut off solenoid :) hope this helps !
 
dollydisco said:
if you havent had the cambelt off then no it shouldnt of just changed. so to make things clearer, we have fuel the the sedimenter underneath,we have fuel at the top of the pipe leading from the sedimenter to the lift pump on the side of the engine,
next question. take the pipe off the leads from the lift pump to the filter housing, then get pumping on the lever,again if no resistance turn the engine over a little until you do get resistance ,if all okay you should get fuel out. if not then i would check for air leaks on the top of the sender unit under the access panel in the boot!! if you do have fuel,then reconnect the pipe from the lift pump to the fuel filter,and remove the bolt securing it to the filter housing,see if you have fuel from the end of that pipe, if not then the problem is blocked pipe, if you so then put the hose and banjo bolt back in,remove the fuel filter and pump againmsee if you get fuel out of the bottom of the housing,if not then problem is a blocked banjo bolt into the filter housing, if you have fuel the refit the filter, take the bleed screw alll the way out,and get pumping untill you have clean air free fuel flowing,refit the screw then remove the pump end of the pipe that leads from the filter housing to the injection pump, again pump the lift lever and se if you get fuel,if so,clean the hole in the centre of the banjo bolt and refit,then remove the tops of the injectors pipes ( where the unions screw onto the injectors) then ensure you have 12v + feed to the fuel cut of solenoid. then crank it over untill you get fuel. if you still have no fuel from the injector pipes but have fuel to the injector pump then your problem is a dodgy fuel cut off solenoid :) hope this helps !
Click to expand...

That's a great summary of mostly what ive been doing this evening! Thanks, if has somewhat reasurred me that based on the help and advice I've been getting off LZ I'm doing the right thing :)
Tomorrow eveening I shall again double check that the fuel line is free from air all the way to the input of diesel pump. Have now fitted a new fuel shut off solenoid and lift pump, so shall the crank it over for as long as long as the battery last or until diesel starts coming out of the injector feed pipes.
The annoying thing is I'm limited to a minute or so of continuous turning over and then have to wait over night until the battery is charged again..

One other thought is that I've replaced the serpentine and air con belts but can't imagine I could have fittem 'em wrong and bypassed the fuel pump wheel??
 
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