My '82 240D died on me coming home the other night. Went to pull away from stop light & stumbled and died. Got into a parking lot & changed both fuel filters. It looked like there was some air in the small one. I went to prime it & I could tell nothing was happening. I wasn't getting any resistance at all. Before when I changed the filter, I'd get fuel leaking all over the place.
Does this mean my I.P is shot? Can I replace the prime part separately? Any tests I can do to check things out (other than just cranking the motor over & over & over)?
I have a WVO conversion set up on the car, but wasn't using it at the time because I had gotten air in the fuel lines of my WVO earlier in the day. I had been driving about 25 miles or so on diesel when the above happened.
I hate to bug you guys, but I am new to MB & diesels so I'm kinda stumped.
Even with the WVO use it is most likely a Fuel Supply Problem. Meaning; Fuel Tank Screen Plugged, Fuel Supply/Lift Plump (on the side of the Fuel Injection Pump), Hand Primer Pump allowing air in Plugged Filters.
What is missing is an organized way of trouble shooting.
I would go out and get several Feet of SAE 30R7 5/16 Fuel Hose (it is also rated for Diesel Fuel) and hook it to that Clear Plastic Primary Filter and run the other end into a 1 gallon or more container of clean Diesel Fuel. (This bypasses anything to the rear hopefully including that WVO system.)
Bleed they Fuel Supply System by loosening the Banjo Bolt that is between numbers 1 and 2 in the pic (the one that the Cigar Hose attatches to) and pumping on the Hand Primer until I ge a good amount of Fuel out; tighten the Bolt up and continue to pump some more just to be sure.
If you are unable to get a good amount of Fuel and/or no matter how much your pump you keep getting a bunc of Air replace the Hand Primer
Next to bleed the Air out of the Fuel Injection part of the system I would loosen all of the Fuel Injection Line Nuts up at the Injectors.
Crank the Engine until you see Fuel coming out from under all of the Nuts and tighten them up.
After that tighten the Nuts at the Injectors and attempt to start.
The sell new Fuel Supply/Lift Pumps and they also sell 2 types of rebuild kits for the Fuel Supply/Lift Pumps. Peachparts sells them and I have read Mercedessource also sells them. I do not know if the sponsers of this forum sell them as I have never looked.
If it runs OK on the Container of Diesel Fuel I would suspect a problem to the rear like a Clogged Fuel Tank Screen or that WVO set-up. You might want to temp disconnect the WVO set-up until you clear your problem up as it just makes it harder to trouble shoot.
If it starts on the Container of Diesel and you have found no problem to the rear then I would suspect the Fuel Supply/Lift Pump is not able to pull the Fuel from the Tank and/or the Hand Primer has a large Air Leak ($13 or less; get a Bosch one as Bosch claims they have a Viton Seal inside).
Why do you want to loosen the banjo bolt on top of the fuel filter? It has an automatic valve, just pump the hand pump and wait for the sound of the valve opening.
Air in the high pressure lines can be dealt with by the starter engine.
Why do you want to loosen the banjo bolt on top of the fuel filter? It has an automatic valve, just pump the hand pump and wait for the sound of the valve opening.
Air in the high pressure lines can be dealt with by the starter engine.
When I write these sort of things I try to size up what type of knowledge the person I am writing to has.
He also needed to know if his Hand Primer was working or not. I felt loosening the Banjo Bolt at the Return Line junction will give him more information as he could actually get some visual info as to how well his hand primer was working.
If you want to you can keep cranking and cranking your Starter to try to get the Air out of the High Pressure Fuel Injection Lines if you want to; but it is hard on the Battery and hard on the Starter.
But, I would never recommend that except on the newer model Mercedes that you have no choice do that on; due to no Hand Primer on that system.
And, he also needed to know if he was actually getting Fuel up to his Injectors. My suggested instructions allowed him to Bleed the Air out and at the same give him the information if he was getting Fuel up to the Injectors
check autohausaz, I just got a hand primer from them today and it was less than $10.
I buy most of my stuff there also.
I would get the Bosch one as it has a Viton Seal inside and also lately some members of another forum have had problems with the Febi made Hand Primers.
The AutoGuide.com network consists of the largest network of enthusiast-owned enthusiast-operated automotive communities.
AutoGuide.com provides the latest car reviews, auto show coverage, new car prices, and automotive news. The AutoGuide network operates more than 100 automotive forums where our users consult peers for shopping information and advice, and share opinions as a community.
Testing injection pump on 240D 
Linear Mode
