I wanted to question the diesel fuel tank. I have wondered in the past about running on the top side of the tank, whether it would be the best. I thought it might help eliminate some of the issues encountered with the different growths etc. I know it seems like I run much better with the tank pressure that way. The 123's are marginal, as far as, feed is concerned. I think they could benefit with a secondary inline. I have always heard on the gas engines peoples talk about it's cheaper to run on the top side of the tank!

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Rebe

Do you mean to suck the fuel from the top side, and not suck it from the bottom side?

MB`s suck the fuel from the bottom of the tank, at least our diesels do.

You might be thinking of using the fuel from full to half, and then top it off again and not run it below the 1/2 way mark?

A full tank has less problems with condensation. As the fuel is used, air is drawn into the tank along with moisture which is in the air. as the tank cools, the moisture condenses on the sides of the tank, it then collects on the bottom of the tank. under the right conditions then algee, or them little bugs have a tendency to start growing.

A tank that is being used and constantly filled, has a less chance of the bug problem.

I don`t follow you on "Tank pressure" "123`s being marginal" and a "secondary inline".

There shouldn`t be any tank pressure.

Charlie

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there were three HP ratings on the OM616...

1) Not much power
2) Even less power
3) Not nearly enough power!! 240D w/auto

Anyone that thinks a 240D is slow drives too fast.

80 240D Naturally Exasperated, 4-Spd 388k DD 150mph spedo 3:58 Diff

We are advised to NOT judge ALL Muslims by the actions of a few lunatics, but we are encouraged to judge ALL gun owners by the actions of a few lunatics. Funny how that works

You could just swap the lines under hood, but you run the risk of running out of fuel.

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83 SD

84 CD

I think the "tank pressure" the OP was trying to describe was actually fuel weight pressure, where a full tank of fuel will allow an engine with a clogged strainer to run where a close to empty tank will not.

If you keep in mind when designing a fuel system that oil (diesel is an oil) is lighter than water and floats on top, you will be ahead of the game.

I kept that in mind when I designed my veg oil system. I have a floating pickup in my VO tank and also in my VO filtration system. It draws fuel from the top and my VO filter does not clog, verified by a zero vacuum gauge reading at the IP inlet on my Jetta (i.e. no restriction from the filter after 20k miles).

A floating pickup is easy to make. Think float on a fishing lure and a flexible fuel pickup hose. It can be done easily on a W123 by going through and gutting the fuel strainer. You will never have to change your fuel filter and not have any problems with a little water in the bottom of the tank.

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85 300D turbo pristine w 157k when purchased 161K now
83 300 D turbo 297K runs great. SOLD!
83 240D 4 spd manual- parted out then junked

This is not true. After 30 Years or so of use the Lift Pumps need to be rebuilt and the Fuel Pressure Relief/Overflow Valves need to be replaced or the Spring changed inside of them.

The growth issue can be taken care of by using Chemicals to Kill it and then trying to make sure you don't get anymore contaminated Fuel.

If you think Water is an issue add a Water Seperator to the Fuel System.

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84 300D, 82 Volvo 244Gl Diesel