Thread: Fuel tanks acting strange, '75 300d
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Old 08-01-2016, 07:57 AM
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Join Date: Apr 2005
Location: Lafayette Indiana
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Quote:
Originally Posted by sailorbenjamin View Post
Two questions. Got a 300d fresh out of long term storage. Won't start. Got bubbles in the fuel lines and I don't know where from. Decided to replace all the rubber fuel lines to start.
Easy question first. Two hoses coming out of the tank, right? Upper is just straight 5/16. Lower looks to be 3/8" at the line and 1/2" at the tank. Am I seeing this right? Would MB actually do such a thing to it's loyal followers? Where do I get a replacement?
Hard question. I remove this lower hose and not much comes out. Just a few drops. Then I remove the upper hose and a bunch comes out of the lower hose, like I've released a vacuum. So I'm assuming the lower hose is the feed hose and the upper is the return. Does that make sense? And I'm concerned that if nothing comes out of it then maybe I've got a plugged vent somewhere that's causing the lack of fuel pressure at the pump. What do you all think?
1. First thing is to verify glow plug function.
2. If you have glow plug function, and it won't start, then to verify it is a fuel problem you can spray wd 40 directly into the intake while cranking with glows hot. It should run on the wd40 as long as you are spraying it in. If it runs on the wd40 then you have a fuel supply problem.
3. If you have a fuel supply problem you should put biocide in your tank to kill any bacteria growing there. Once they have been killed they should flow out and the car should run if all the hoses and such are intact.

Only after doing these simple things would I suggest going to the more advanced actions suggested above.

If you have fuel and compression you can sometimes pull the car to get it started without glow plugs. I've done this with success.
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