|
|
|
#1
|
|||
|
|||
fuel starved 300CD???
So on my trip to my mom's to day car begins loosing power at 60 mph. Car is only a few months old and I have just begun to use the AC and I thought that could be it. Did better with the AC off but on log acceleration began loosing power to the point I pulled off the highway. Then it recovered and I made it to my destination on side streets. Well, to make a short story long when I looked under the hood and raced the engine I could see the small see through fuel filter get depleated of fule and then refill. Supposedly all fuel filters have about 2000 miles on them. Clear filter looks clean to me.
1. Fuel pump problem? 2. Crud in gas tank cloggin line (down to less that 1/4 tank for first time for me). 3. Hot day vapour lock? Thanks for any help. Chad "Experience is somthing you get just after you need it" |
#2
|
|||
|
|||
Sorry. Meant to say car is new to me. Its an 83 and I have only had it a few months. Beer does not improve my composition skills (or spelling).
Chad |
#3
|
||||
|
||||
i pick choice #2
__________________
79 240D my current toy 42 years a Diesel addict 240D sold 250SE sold 220D sold 280C sold 280S sold 300D (2) sold 300CD sold 300DT sold 300SD sold 380SL sold |
#4
|
||||
|
||||
I would say number two also, but you say the prefilter is not dirty soooooo..... I think that would eleminate #2. Lift pump maybe? Air leak maybe?
__________________
"If anyone knows other lessons I need to learn, please tell me. I'm tired of learning them the hard way". by JerryBro The Glow Plug Wait: This waiting period is a moment of silence to pay honor to Rudolph Diesel. The longer you own your diesel the more honor you will give him". by SD Blue My normal daily life; either SNAFUed- Situation Normal... All Fouled Up, or FUBARed- Fouled Up Beyond All Repair 62 UNIMOG Camper w/617 Turbo, 85 300SD daily driver- both powered by blended UCO fuels |
#5
|
||||
|
||||
#2 in a way. Your fuel tank screen is clogged with debris or algae. You will have to remove the screen and clean it. My daughters new 240D would do the same. Screen was coated with algae.
Do a search on fuel tank screen. Lots discussed on this. Dave
__________________
1970 220D, owned 1980-1990 1980 240D, owned 1990-1992 1982 300TD, owned 1992-1993 1986 300SDL, owned 1993-2004 1999 E300, owned 1999-2003 1982 300TD, 213,880mi, owned since Nov 18, 1991- Aug 4, 2010 SOLD 1988 560SL, 100,000mi, owned since 1995 1965 Mustang Fastback Mileage Unknown(My sons) 1983 240D, 176,000mi (My daughers) owned since 2004 2007 Honda Accord EX-L I4 auto, the new daily driver 1985 300D 264,000mi Son's new daily driver.(sold) 2008 Hyundai Tiberon. Daughters new car |
#6
|
||||
|
||||
Most people seem to feel a power gain on the bottom 1/4 of the tank (additives?!), but when you get the power loss on the bottom of the tank it is most likely a clogged fuel tank screen.
There is no lift pump. The IP sucks the fuel in as wanted.
__________________
Jeff M. Mercedes W123 DIY pages are now located here. 1983 / 1984 300D Sold 2000 CLK430 Cabriolet ~58k Sold 2005 Avalanche 4x4 ~66k |
#7
|
|||
|
|||
Thanks for giving me a place to start.
|
#8
|
|||
|
|||
I could be wrong but I think there is a fuel pump in addition to the I.P. but much, much more likely to be something easier to check. Here's a pic of my tank filter in case someone tries to tell you it's not worth checking...the crud was clogging up the whole inside too.
__________________
'84 300SD veg-oil bliss '83 300SD veg-oil beater |
#9
|
|||
|
|||
Boost.... ,
You are incorrect: there is a fuel pump. It is mounted on the side of the IP. The fuel goes from this fuel pump into the secondary (can) filter and then into the IP reservoir. The overflow valve in the IP regulates the fuel pressure and releases overpressure fuel back thru the return libes to the fuel tank. The IP has to be pressurized for the fuel to be pushed into the barrels. No fuel pressure in the IP, no fuel injected into the engine and the engine will not run. Power gain for fuel tank 1/4 full. There is a German word for this: Sheizen. Look it up. P E H Last edited by P.E.Haiges; 05-10-2004 at 07:33 PM. |
#10
|
||||
|
||||
I completely agree there is a pump but I don't believe it is coined a "lift pump." Lift pumps are normally seperate of the IP, in the fuel line somewhere between the tank and IP. I thought the pump was inside the IP, requiring partial disassembly to replace it. Learn something new everyday.
Lol, not a word in the translator but I know what it is. After finishing up all those words in english while working on cars I revert to other languages.
__________________
Jeff M. Mercedes W123 DIY pages are now located here. 1983 / 1984 300D Sold 2000 CLK430 Cabriolet ~58k Sold 2005 Avalanche 4x4 ~66k |
#11
|
|||
|
|||
Boost... ,
My Chevy Diesel PU truck has a lift pump. Its mounted on the side of the engine exactly like the ones on the gasoline engines, and driven by the same internal camshaft that works the valves. However the MB fuel pump serves the same purpose, to pressurize the IP pump. The fuel pump on MB Diesel engines is held on the IP with two nuts if I remember correctly. It is integral with the primer pump. The newer engines like the 603 don't have a primer pump. I wonder what they changed that allows the newer engines to prime themselves. I ran my 603 out of fuel and just cranked the engine with the starter until it started. I found out you need to add more than one gallon of fuel to get it started, though. My 617 engine will start with a gallon added to an empty tank. P E H |
#12
|
||||
|
||||
Re: fuel starved 300CD???
Quote:
The problem still occurs. The only components common the before/after, are the metal fuel line, and the flexible pipe from the strainer to that metal fuel line. I suspect that the flexible fuel line has delaminated internally and is blocking itself when conditions are conducive, releasing when the suction is released. I have reversed the fuel and return lines, as they both go to the bottom of the fuel tank. The car no longer has fuel starvation problems. I will buy a replacement flexible fuel hose to hold as a spare.
__________________
Tony from West Oz. Fatmobile 3 84 300D 295kkm Silver grey/Blue int. 2 tank WVO - Recipient of TurboDesel engine. Josephine '82 300D 390kkm White/Palamino int. Elizabeth '81 280E, sporting a '79 300D engine. Lucille '87 W124 300D non-turbo 6 cylinder OM603, Pearl Grey with light grey interior Various parts cars including 280E, 230C & 300D in various states of disassembly. |
Bookmarks |
Thread Tools | |
Display Modes | |
|
|