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  #1  
Old 09-07-2006, 08:15 AM
Nissan_diesel
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84 300 d won't stay primed up

I have a 84 300d that will not stay primed up just in stalled the new primer so that is working also put a 12 volt fuel pump in line after the main filter. Right now will not start.

In the past once it started it would run fine no problem all day but let it sit overnight and it is hell to get it started again Help PLEASE. Thanks:

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  #2  
Old 09-07-2006, 10:15 AM
Craig
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First, how did a 12V pump get in the fuel line? I would start by getting rid of that pump. How do you know it's not staying primed, what are the symptoms? The two most likely problems are an air leak in the fuel line and clogged filters. Have you changed both fuel filters? Are there any fuel leaks on the car?

BTW, you would probably be better off posting this question in the diesel forum.
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  #3  
Old 09-07-2006, 10:43 AM
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Join Date: May 2006
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1. You will get more response in the Diesel area.
2. You have added "also put a 12 volt fuel pump in line after the main filter" ... Why? I assume you use the term 'after' to discribe 'downstream' and that you have a pump installed between the canister filter and the IP? That is not common practice. Some folk, using an alternative fuel, place a 'faucet' style pump downstream from the fuel tank outlet.
Is the clear pre-filter black or has black spots? This is alge growth and your strainer may be plugged.
Have you verified the fuel supply? This test takes 10 minutes if you have car ramps or a handy curb. Try jacking up the rear of the car (or use a curb), crawl under with a screwdriver, rag (you will loose some fuel), safety glasses and the largest pail that will fit, remove the fuel line on the pass. side of the differential and verify flow and quality of fuel. You should get a steady, roughly 1/4"-3/8" stream of clear fuel. If not, your in-tank fuel strainer may be plugged. If plugged: some folk have reversed the fuel lines in the engine compartment ... swaping the return line for the output line, drain tank and use biocide or gassoline to flush the tank, remove tank and flush. I would rather fix the strainer/fuel problem.
If you have installed an additional fuel pump as I discribed, try removing this pump, use a temporary fuel tank (used, clean, plastic bottle) installed up stream of the pre-filter (clear, small, plastic filter) prime and see if the engine runs. If engine runs, you have a leak in the fuel line between the prefilter and the tank (assuming the additional pump issue has been corrected).
3. Primming: I have a 79 300 SD and after replacing a failed OEM primer, had to crack the IP to nozzle nuts 1/2 turn and crank the engine over till fuel leaked from all nuts. I had to turn the engine over way more times than I thought needed. Some manuals (notably the !@$##!@@! Haynes ) stated cracking the banjoe bolt nut on the canister filter housing to manualy prime. This is bunk. The canister filter housing has an air bleeder hole (at least on the MB's I've worked on).
3. You may have a leak in the fuel line allowing air to block fuel flow. Verify fuel flow using the IP to nozzle line nuts. This will test every part of the fuel system except the nozzles and IP timming ... lines, filters, pump, etc.
4. Test the fuel that leaks from the IP to nozzle nuts for diesel smell. Someone may have added water to your fuel & or your alternative fuel process is faulty.

Good Luck. You should be on the road soon and with out the tow $ it took for my education!
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  #4  
Old 09-07-2006, 01:20 PM
Nissan_diesel
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300d won't start

Ok I have replaced both filters but if has run since then.
The 12 volt pump was installed to prim when the primer was bad
that has now been replaced. If you loosen the nut that the line go to on top of 2nd filter and turn the 12 volt pump on you do get fuel there.
It did start the other day after almost killing the battery.
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  #5  
Old 09-07-2006, 01:27 PM
Craig
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I'm guessing you have an air leak someplace, check all the connections.
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  #6  
Old 09-07-2006, 06:20 PM
Nissan_diesel
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Update

Update after about 3 min. cranking it started and them an hour later it started with a little cranking. Will update in the morning and let you know if it starts ok:

Thanks:
Ronald
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  #7  
Old 09-13-2006, 07:09 PM
Nissan_diesel
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update

# 2 and #4 glow plug was bad car starts up fine now

Thank for the help...

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