Fuel problem W463
Fuel problem? I was driving up a 1 in 4 hill out of Lythe near Whitby when the engine shuddered to a holt and stalled not the safest of hill to conk out on!
I tried to restart it and finally it spluttered and fired up I put it into low box and got to the top of the hill engaged high ratio and carried on only to stall about a mile on, I pulled in go out and took the fuel cap off I heard a sucking noise tried again and it started.
I turned around and took it home with no problem. I am going to change the fuel filter but can anyone tell me if there is a breather in or around the diesel tank and have had a similar problem?
My G is a 435 1992. Thanks Griff
Griff, the breather is in the filler cap - give it a good blow out with an air line if you can. If you were on a steep hill and the fuel was low you probably sucked all the crap into the fuel line - might be time to flush the fuel line and drain the tank into a clean (light coloured) bucket. let it settle overnight and see if there is any crud in the bottom.
If you have been experimenting with veg oil/chip fat then that can rot some fuel pipe.
Thanks Smithy
The tank was 3/4s full and has never been on veg oil but I will check the cap couldn’t look last night “8 pm dark wet and very cold on the moors†is not a good place to break down it’s the first problem I have had in 4 years, do you know if is it best to fill the filter with clean fuel before fitting it?
Griff
Can't do any harm to soak the filter but shouldn't be neccessary.
Have a good look at the old one to see if any biggish bits to indicate fuel line deterioration.
My guess is just a new filter and clean out the breather and all will be fine
Cheers
Chris
Griff,
There is, I understand, a filter inside the diesel tank,
others have had the same problem,
it gets clogged with black slime
Try searching, not to sound cheeky
I know there were plenty posts on this subject
Marcus
Marcus
Found the posts on black goo sound advice I will have to look at it before I change the filter my G has the same fuel symptoms as the goo on the sender filter.
As it said its when the engine is labouring I was pulling up a 1/4 hill pushing it in 3rd gear at 4tho reves and it died on me.
Thanks
Griff
Hi the ONLY way to get ALL the gunge out is to remove the tank from the vehicle..with all the related problems that causes.....once the sender is removed(note the wire locations) you can see what is going on...use petrol or white spirit in a pump up garden spray (petrol may naff the seals) if you use a water jet pressure washer you can blow holes in the tank where the corrosion is obvious (no problem with plastic tanks) pretreat the nuts on the two metal straps holding the tank with WD40 or similar and molegrip the strap behind the nut when you start to undo. with the hoses disconnected purge each one before reassembly......and don't forget the "inline" filter
Griff, you describe your G as a "300 GDS Diesel 462 SWB 1992" when in fact it should be a W463...
463 Correct a typing error now I've sorted it. I was thinking of a cat 435 scraper box not many people will know what that is.
I have pulled the sender out of the tank and striped down there was no filter gauze just the float and the fuel pipe going to the bottom of the float chamber and clean.
On the top of the float chamber there is a large pipe and small pipe but the smaller fuel pipe is cut off with a bolt pushed into the rubber pipe, is this my breather pipe. Anyone know where it should go to?
Well it should be Cat of course
I take it that is a towed scraper ie an earthmoving unit
Marcus
BSc C Eng ( failed )
Yes they were pulled by a Cat D8 there are still some working in the UK
I cut my teeth working on them as a fitter and many other Cats as well as other types of construction equipment (to old now) still working but selling to the construction industry
Hi the pipe with the bolt in it should link with a"T" piece to a pipe that runs across the tank from another breather point in the tank behind the n/s rear wheel arch//this long pipe runs up the main filler neck on the rear side to about 6cm from the cap flange and vents and breaths into the neck cavity.it would appear that with the breather blocked with a bolt the fuel pump sucked fuel until it created a vacuum hence the "sucking noise" when you took the cap off...look at the breather pipe in the n/s wheel arch area on top of the tank as that would appear to be closed as well...
I have owned this G for four and a half years and have never had a fuel problem even with the blanking modification until last weekend strange, I will have to remove the plastic inner arch cover to see the pipe on the fuel filler and sort it out.
I’ve just fitted a set of tyres on the old girl maybe she doesn’t like change!!!
Hi the vent in the fuel filler pipe will not be the problem.. the vent on the top of the tank behind the near side rear wheel arch must be blocked as well as the one on the sender ... if the crossover hose connecting the n/s breather and the sender breather outlets is missing altogether then in order to stop diesel running out when the tank is full both vents would need to be sealed. on the petrol G the tank cap is sometimes vented or there is a charcoal impregnated filter and a "swimming vent"fitted
Still have the problem
I have changed the fuel filter (filled it with clean diesel before fitting) and checked the sender in the fuel tank, but still have the problem with my G. It will only go approximately 6/7 miles hard driving up a 1 in 4 and 3 miles further on then the engine stalls, but after 10 minuets of trying to start the engine and cracking the injectors the engine fires, it doesn’t start straight after I crack the injectors but a few tries later. Any one had a similar problem?
If I put a new fuel line from the larger pipe on the tank sender to the fuel lift pump would it solve my problem also has any body got a fuel line chart on a 463 1992 so I can see where all the pipes go?
Griff
Hi try driving it the same route with the fuel tank cap off...if still the same problem check the fuel pipes from the tank to the pump a kinked pipe will reduce flow... a rubber hose suffering from internal decay will restrict flow.obviously something is starving the engine of fuel.I have a schematic of the fuel linelayout but would need to fax it to you.......
A fax would be great to 0191 492 044
Thanks Griff
Hi Griff,
Your ultimate resolve will be to remove the fuel tank, clean and flush out the system throughly. To proove the point, the problem is to lie with the fuel tank, is to keep on board a seperate, portable diesel reservoir, to be mounted higher the the level of the injector pump, connected with an adequeate sized fuel hose. Which, can be attached to the injector pump at the time of fuel starvation occurring.
Substitute fuel supply to your new supply and run the vehicle, if a noticeable improovement is experienced, then it is obvious the fuel tank is drawing over your 7 mile run some contaminant to the fuel supply line blocking the supply. I would stress to reverse blow the fuel supply line also.
Regards,
Thanks for that Rakesh
Yes I have thought of that a lot of work but it has to be done from source to injector pump. Could anyone tell me if the large 10mm pipe from the tank sender runs direct to the fuel pump?
Griff
JOIN THE GWOA
This website and forum are provided for the benefit of enthusiasts and owners of all Mercedes Benz off road vehicles, in particular the G Wagen. The costs of development, upkeep and provision of the site are met entirely by the annual subscriptions of club members. If you are using the site and are not a member of the G Wagen Owners Association please consider joining. You will have access to areas on the site that are not open to non members, to club trips and meetings and to technical assistance. In addition your contribution (only £25 annually) will help us maintain and develop our website for future users.
Who's new
- Jaffa_JIM_23
- Wrabstar
- GG
- KTMSCANIA22
- 280ge
Thanks Smithy
The tank was 3/4s full and has never been on veg oil but I will check the cap couldn’t look last night “8 pm dark wet and very cold on the moors†is not a good place to break down it’s the first problem I have had in 4 years, do you know if is it best to fill the filter with clean fuel before fitting it?
Griff