dropped the tank on the td - PeachParts Mercedes-Benz Forum

83-240D · #1 10-31-2005, 06:27 PM

it isn't picking up the last 1/4 tank. must be a fouled strainer.

anyway, besides replacing all the 25 yr old rubber, and some of it looks fabric, with viton, what else should i inspect while the space it free?

t walgamuth · #2 10-31-2005, 06:30 PM

never dropped one. just look around.

as yogi berra used tosay "its amazing what you can see just by looking!"

tom w

dieseldiehard · #3 10-31-2005, 07:17 PM

Quote:

Originally Posted by 83-240D

it isn't picking up the last 1/4 tank. must be a fouled strainer.

anyway, besides replacing all the 25 yr old rubber, and some of it looks fabric, with viton, what else should i inspect while the space it free?

The TD is easy to see into the bottom of the tank using a flash light. Use compressed air to blow the line from the engine side back, if you don't see algae it aint algae.

First, have you got plugged lines from the stuff that results from mixing B100 with diesel or WVO?

If not then have you ruled-out the lift pump (the hand primer pump is located on it)?

If the same symptoms remain after replacing the hoses then you MAY have a tiny hole in the steel supply lines. Put a little air pressure on the tank after its reinstalled and put some fuel in it. just a gallon is enough and use just 1 or 2 psi of air, that is sufficient, look for fuel coming out of a section of line where internal rust might have made it thin. A rubber glove over the filler cap might serve to form a seal I haven't done this but someone indicated they did and found a tiny leak.

How does the 1/4 tank come into play? Well, with more than 1/4 tank there is enough pressure from the weight of fuel and gravity that it will prevent the hole from drawing in air bubles yet never causes a major leak because the pressure is small compared to the size of the tiny hole. When it gets down to 1/4 full the pressure from fuel is dimminished to the point that air is drawn in, at least that is the theory I heard on this.

Also, I wonder what sizes of Viton you found that fit? The screw-in hose piece I suppose you made-up somehow, using the old part and Viton? tell us more. Inquisitive minds want to know!

83-240D · #4 11-01-2005, 10:56 AM

at 1/4 tank the engine is running rough and stalls. i am just thinking that the bio d has cleaned the tank and left stuff around the strainer that won't go thru the holes. if when the tank is full anything around the strainer would float in the body of fuel and everything is fine until the fuel resettles to 1/4 tank. this has happened tow or three times so that leads me to think it is tank gunk.

i had the same problem with blondie and after dropping and cleaning the tank(easier in a sedan by the way) black semi soft globs came out and no more problem.

dmorrison · #5 11-01-2005, 01:37 PM

Yes check everything you can see while it out. Why drop the tank for the straininer. It just a 22 mm bolt with 2 nuts jambed on it to remove. Inspect it and if algea or dirty, then clean the tank.

Dave

83-240D · #6 11-01-2005, 01:39 PM

are you sure its a 22mm hex head?

the tank is hung up with what looks like a fuel overflow loop that will not come off the filler neck. i hesitate to cut it for fear of not finding a replacement.

been around town and found a 22mm hex head but its too large.

thopught i saw a post stating 13/16 which might be 20 mm.

dmorrison · #7 11-01-2005, 11:10 PM

IF THIS IS A station wagon. 300TD. Buy a bolt whos head width is 22 mm across. Jamb 2 nuts on it and the head will fit in the reciever of the screen. if it is a sedan then this does not work.

Dave

Just measured the one I use. Its 22mm