76 300d fuel problems....
 

Very odd fuel problems.



On a full tank, it takes forever to start. A close to empty tank will start no problem.



I have no idea. Car also has white smoke at idle.

Leaky lines or primer pump? Air bubbles getting into the system?

Just my train o' thought.....
 

If you have a full tank of fuel, you will have a positive head on the fuel pump, and oil will leak out if there is a problem there......if there were a problem in the area of the FI pump I, personally, would suspect that a reverse of the symptoms that were stated......

Supposing that there is a clog in the fuel tank vent......then with a full tank there would be a lesser volume of atmosphere within the tank.....thus causing fuel to flow more slowly.....when there is a greater volume of atmosphere within the tank (less fuel) then I would think that fuel would flow more easily...initially.....as it would take longer to pull a vacuum within the tank.....

Try removing the fuel cap when you have a full tank.....and see if it makes a difference.....if it does, as I suspect it will.....clean the tank vent and you will be good to go wherever and whenever....regardless of the amount of fuel within the tank.....

SB :D

air does not rush in when fuel cap is taken off.

FYI
 

The rubber fuel supply line at the tank was weeping.

I cut off the corroded hose clamps, and replaced them with new worm gear clamps.

This improved performance, and eliminated a weeping fuel leak.

.