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#1
10-10-2008, 06:16 PM
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Fuel leak at primer pump
Hi all,
The girlfriend's car ('85 300D) has a fuel leak right at the primer pump. It leaks slightly when the car is turned off, and is a pretty steady 2-3 drops/second when idling. No idea if its faster at higher rpms. It is dripping off the ip/lift pump assembly right below the primer pump, of course with these dirty old diesels its hard to find exactly where it is coming from. The primer pump is also not working correctly. It is the old style, and when I unscrew the plastic handle and pump, it squirts fuel all over the place around the plastic handle. My understanding was that when the lift pump fails, it fills the crankcase with diesel. The crankcase has a normal oil level so I think its fine. But I was not aware of the primer pump leaking externally, just not pumping properly, when it fails. I guess the primer pump needs replacing, but while I'm at it I'd like to fix the problem. Are there any other seals in there that give out upon occasion?
__________________
1985 300D, 237k. 1994 F-350, 6.9 diesel, 5 spd manual, Banks Turbo. 261k. Sold: 1985 300CD- 267K 
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#2
10-10-2008, 07:19 PM
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Sounds like you need new primer pump. If it's leaking and it doesn't work, I'd put a new one on. It's not uncommon for the primer pump to start leaking at the point where it threads into the lift pump. I'd put a new one on and you'll solve both issues.
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Andrew '04 Jetta TDI Wagon  '82 300TD ~ Winnie ~ Sold '77 300D ~ Sold
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#3
10-10-2008, 07:25 PM
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Quote:
Make sure to get the upgraded style Bosch primer pump.
__________________
Chad 2006 Nissan Pathfinder LE 1998 Acura 3.0 CL OBK#44 "Pleasure in the job puts perfection in the work." - Aristotle (384-322 B.C.) SOLD 1985 300TD - Red Dragon 1986 300SDL - Coda 1991 - 300TE 1995 - E320 1985 300CD - Gladys
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#4
10-10-2008, 10:35 PM
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yes, I had the same thing happen with the old style primer pump leaking, I replaced it with the new Bosch one and have had no issues. You might want to replace some of the fuel lines while you are in there and have the pump out.
__________________
 1985 Mercedes W123 300TD euro Wagon 195k - new Daily Driver  1982 Mercedes W123 300D Turbo Diesel 259k - sold 1977 Mercedes W123 300D Diesel 111k - "Rayzer" - sold
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#5
10-11-2008, 01:18 AM
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+1 more who's old primer pump failed just like you are explaining. It will eventually let too much air into the system and you will have a hard time starting or keeping it running.
Get a new one - it is $21 w/shipping and can be swapped out in 10-15 min.
__________________
1979 240D w/4 Speed Manual, Light Blue Estimated 225-275K Miles - "Lil' Chugs"
Sold but fondly remembered: 1981 300TD Turbo Tan 235K miles, 1983 300SD Astral Silver 224K miles
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