Lister Engines > Lister Based Generators

LISTER TS3. Fuel leak. Tank level? Leakoff? injection or lifting pump?

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ROOKIE:
Hello everyone

I am new here. First intervention.
First of all I thank the forum and its members. This forum is very interesting and informative.

I have a 15kva generator with a LISTER PETTER TS3 engine. Serial number 3906775TS3A008. It was therefore born in 1989 (1950+39? Am I right?).

5 or 6 years ago, I put it back into service. It is now used as a backup on a solar installation.
The tank is a 200 liter drum. The bottom of this drum was above the level of the lifting pump, but more or less below the level of the fuel filter and injectors, depending on the filling level.

It worked perfectly well...

Then the fuel started to leak slightly into the oil sump when the engine was running. Was it due to the change in fuel level in the tank? I don't know.
But I initially suspected a failure of the fuel lift pump and decided to move the fuel tank above the level of the fuel filter and injectors in order to eliminate the lift pump. Done. I went home.
When I returned to the site about 1 month later, the engine had not turned over, the throttle was in the "STOP" position ... the fuel tank was empty ... and the sump oil was full of fuel. The fuel gushed out like a jeyser when I pulled the dipstick.

I drained the fuel-oil mixture. More than 20 liters!
On 1 of the 3 Bryce external injection pumps, I noticed that the HP pipe connection was a little loose, and a slight leak. I tightened it.
I disconnected the fuel leakoff pipe from the tank (see question below). As a reminder, all fuel pipes on the ST3 are external.

Question 1:
I read on this forum that even a leak on an external injection pump can cause fuel to infiltrate the oil sump. Can an external leak end up filling the oil sump??

Question 2:
The fuel leakoff pipe from the injectors is connected to the same level as the fuel supply, under the tank. So there is a little pressure created by gravity. Should I connect it to the top of the tank?

While waiting to find the answers to these questions, I made a leak trap to understand where the leak comes from even when the engine is stopped:
In doubt, I disconnected the fuel leakoff pipe from under the tank. It is now exposed to the air.
I opened the injection pump covers and put clean, dry rags in them to detect a possible leak (the accelerator is still OFF as it was when the 20 liters of fuel went into the sump).
I left the oil drain plug open with a container to see if the fuel is still leaking.
I reconnected the diesel lift pump, I did not reinstall it on the engine and it hangs on the pipes above a container that will indicate if it is leaking.

I will return to the site next week to flush out the "culprit" (maybe me and my mistakes)... but I am sure that several of you already have the answer and I really need your wise advice.

I will take the opportunity to run the diagnosis also found on this forum.

file:///C:/Users/elecx/Downloads/Lister%20engine%20LubricatingOilDilution-1.pdf

Have a nice day everyone. I hope to read from you soon.

Chris
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