diesel lifter pump issue
Happy New Year to all
I couldn't get the 300gd started yesterday. There is enough diesel in it , the oil level is fine, battery is also ok. So we tryed checking the lifter pump and noticed whilst pumping the lifter pump there was diesel leaking through!!!!. i was informed by the recovery man that this shouldn't happen and that after pumping the lifter pump it should get hard which it was not doing also. He told me that it is most likely a lifter pump issue!!!!
I did have a problem in 2011 when i ran out of diesel, couldn't get the car started after even when topped up with fuel. It was taken to a garage who said the lifter pump had packed up. He stated he replaced it with a second hand one which he had lying around and carried out a full service on the g wagon, all seemed well until yesterday. I must note that i have previously stated that i was ripped off by the independent merc specialist as he charged me a arm and leg for service and didn't notice play in both front wheels, lose brake caliper.
i strongly believe the lifter pump is the original one it was not replaced but he must of done something to it in oder to get it working. I have only done 10 000 miles since the lifter pump was so called replaced.
Can some one please advice - is it meant to leak fuel whilst pumping the lifter pump?, is it meant to get hard after pumping? Also can it be taken apart and reconditioned may be with new seals guess that why it is leaking fuel when being pumped. or could there be other issues why it is not starting.
Reagrds
Sati
The primer pump kit is shown on the EPC so a kit should be available. Please furnish your engine number or chassis number.
The pump does harden up when primed.
If you know your pump deatils, parts for could be alternatively sourced from its maker. I am not aware of any after market pumps.
Confirming Rakesh's posting
Pump must not leak
Should quickly go hard
Very common lift pump at one time , used to be several after market suppliers for no money ,always kept one in the tool box - fitted on any thing with a bosch pump , lorries ,plant ,tractors
Also use full as a get out of trouble primer !
Hi
Manual Hand Prime Pump A000 090 88 50 £23 + VAT MBUK
Lift Pump Complete A000 090 18 50 £307 + VAT MB Germany
Gasket to Block A000 091 17 80 £0.95 + VAT MBUK
Pump Valve Repair Kit A001 586 12 07 £11.20 + VAT MBUK
The Lift Pump seems to fit all the OM615/OM616/OM617 engines from the mid 70's to late 80's
The Hand Prime Pump fits nearly the entire MB Van range from 70's and 80's and the entire MB Truck range from 70's, 80's and 90's
The Hand Prime Pump used to have a Silver body with a White turn knob to unscrew and then pump, the latter replacement are Black and the whole outer body unscrews to pump, both are fully interchangable with each other....
Hope that helps
Hi Guys
Update on Lifter pump Issue: Took the lifter pump unit off the g wagon and fed some diesel through it just to check if it working, the pump happens to be working ok, it pumps the diesel out fine. I have a new lifter pump from mercedes which i ordered it is different to the one on the g wagen seems a newer version in black and you do not have to unscrew this one.. Inorder to get the g wagen started i had to bleed the injector valves. I have ran the g wagen for about a week without any issues and then it has decided not to start once again.- Issue seems to be the same as before, its as if there is some sort of fuel blockage, as the engine isn't getting the fuel. I have taken the fuel filter off and there is only a quarter of fuel in it??? Also tryed priming using the lifter pump and once again it is not getting hard and is pissing diesel out.
I will replace the lifter pump with the new one i ordered as i did not replace it as the other one seemed to be working fine when taken of and tested.
Can there be anything else that i need to check that could be stopping the fuel getting into the engine?.
About 3-4 weeks ago i added diesel injector cleaner/purge into the fuel tank, can this cause any issues??
Also i need a new battery as the one on the vehicle seems not to be the correct one its on the small side- my battery tray size is 300-300. What kind of battery do i require for this w460 300gd.???
vehicle identification number is -WDB46033327058328 3 and Engine no- 617931 20 018101.
Regards
Sati
it might be worth giving your fuel tank the once over, they are known to rust top down from where the exhaust insulation holds water
Good point from PRWALES, yours is one of the last G's with a steel tank...
The NEW Black type lift pumps are a straight swop over, make sure you have a new 16mm thin wall washer in there to seal it, and that there is still not the old one in there too....it wont seal properly
Come back on the battery....usually have the big square one on the OM617's
Hi,
I had a similar problem a couple of years ago and thought I had problems with the lifter pump. Came to head when just about to go on holiday, car and kids all loaded and diddly squat from the engine. Grrrrrrrr! Turns out simply had an air lock in the top of the fuel filter (immediately after lifter pump). After fettling with banjo nuts on top of filter and syringing fuel where it should be, fired up and not an issue since... Fortunately less than an hour so only limited cursing in earshot of kids, oh, and not a penny spent!!!!!
Wonder if perhaps this could have resulted in your initial problem? Anyway, good luck.
Stewart
Should add my fault had been caused by replacing fuel lines and in-line filter and perhaps not being as diligent as I should - at the time only had on street parking and was cautious of traffic etc. Work in garage now and moving up the DIY scale, especially under recent excellent GWOA 'in-house' training. Can't beat the support of club members!!!!
Read somewhere that someone recommends fitting a low pressure inline pump (mainly to push veg oil) near the fuel tank. This apparently pushes fuel to the injection pump and helps move the fuel without having to pump.
Does this sound like an idea, is it a good idea. Apparently also adds a bit of power and helps going up hills?
Anyone heard of this?
Good advice. It may not be just rust, but fuel infestation that makes the fuel go sludgy. Easy to spot in the pre lift filter. Quite a common problem with yachts when left with half tanks during winter lay ups. In this case one needs to disinfect / steam clean the tank.
Hi Guys
..............About 3-4 weeks ago i added diesel injector cleaner/purge into the fuel tank, can this cause any issues??
Regards
Sati
The diesel injectors may need bleeding if fuel has been starved and attempts to start it will have bled air into the injectors.
Diesel purge would not affect the engine.
When the primer pump hardens the fuel filter has to be bled followed by each injector.
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Hi Guys
Thank you all for your responses, they have all been very helpfull, i havent had chance to check the lifter pump as im working away until tuesday. When im back i will try taking the lifter pump off and im hoping its smoething trival and easly replaced. i will also get back to you with details of chassi number.
Regards
Sati