Lucky versus good; lucky won out (troubleshooting)

All,

Had a diesel engine which indicated high fuel rail pressure.

With another pressure gauge, it was indeed too high.

The return line to the tank was suspect. Two lines combined into one at a tee. I had a 50/50 chance of getting it right.

Here's the good part, the fuel tank was plenty cold, and just by feeling the fuel lines (engine running) with my hands, could tell which was the culprit, and where the obstruction was.

Made for a simple repair. Break the line and find the faulty check valve innards.

Good thing Minnesota is cold !

D.
 
What kind of engine? A high pressure common rail engine *shouldn't* be affected by high return pressure to tank. The common rail pump get meters fuel to maintain rail pressure commanded by ECM. You would have got a high fuel pressure on the supply to the high pressure pump but not rail pressure.
 
I am a retired electronics technician and spent the last 25 years taking care of switching offices, data circuits and fiber multiplexers for our local phone company. I cannot count the number of times I found a difficult problem by luck. Things like finding a loose battery connection by burning my hand on it. Wish I had found that one a different way. At least they seemed like luck to me, I am not smart enough to have done it otherwise.
 
DLMKA,

ECM?

This engine dates from 1959 ish. Each cylinder has it's own injector pump. I was describing a low pressure common rail providing pressure ( less than 30 psig) to the injector pumps.

Sorry for a poor description.

I still maintain that I was lucky the fuel was cold compared to the engine. Even luckier that I had placed my hand on the lines. Dumb luck some would say.

D.
 

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