Found a solution to diesel runaway.

ProcrastinatorFraser · May 8, 2015

A few weeks back, my landy decided that it would have a diesel runaway.
Because i was in the state of restoring where i did not have any gauges on the vehicle, i did not know how much fuel was in the tank. What had happened (i assume) is that the injector was grabbing an air/fuel mixture directly from the pump, meaning it was grabbing more air than necessary, so was accelerating. So if your vehicle is accelerating uncontrollably, check the fuel level, it could be low.

blue beasty · May 8, 2015

fanatic · May 8, 2015

oh right

vilguy · May 8, 2015

:hysterically_laughi

CalumM · May 8, 2015

Runaway is when it burns its own oil...

blue beasty · May 8, 2015

CalumM said:
Runaway is when it burns its own oil...

Or leaving the hand brake off

Saint.V8 · May 8, 2015

????....How does air in the fuel lines cause runaway.....air locks in the lines usually causes it to stop!

fanatic · May 8, 2015

compression ignition needs fuel to increase engine speed, petrol rich will accelerate as it leans out.
But please educate us

ProcrastinatorFraser · May 8, 2015

What i mean by this is that when my car was having a diesel runaway, it was due to a lack of fuel. What happened is one evening, i was driving, diesel runaway. Put more diesel in the tank, let it run a few minutes, then it stopped. Same thing happened a bit later that month, the same solution was used. Worked both times.

ProcrastinatorFraser · May 8, 2015

I don't mean that this is the solution to all cases of a diesel runaway, but it worked in my case, i'm simply telling people to check fuel levels, cos it was the problem on mine.

blue beasty · May 8, 2015

ProcrastinatorFraser said:
I don't mean that this is the solution to all cases of a diesel runaway, but it worked in my case, i'm simply telling people to check fuel levels, cos it was the problem on mine.

I doubt that. A diesel needs more fuel to increase revs, it's not like a petrol where they will rev up just as you're running out.

I'm a bit worried that you have another issue and don't realise

wattfield · May 8, 2015

It could be your accelerator pedal was sticking.

blue beasty · May 8, 2015

Which engine?

Marmaduke · May 9, 2015

If I understand correctly diesel runaway is where you have crank case pressure and oil mist blowing through the engine breather into the air intake and back into the engine via the turbo, basically running on its own oil rather than diesel via the injectors and there's no stopping it which is why it 'runs away'. Nowt to do with fuel level as the engine is running independently of the fuel supply

trax · May 9, 2015

Marmaduke said:
If I understand correctly diesel runaway is where you have crank case pressure and oil mist blowing through the engine breather into the air intake and back into the engine via the turbo, basically running on its own oil rather than diesel via the injectors and there's no stopping it which is why it 'runs away'. Nowt to do with fuel level as the engine is running independently of the fuel supply

for defenders it's usually failed turbo seals. oil gets blown past the turbo seal and into the intake

air in the fuel lines.. he is procrastinating a bit too much.. it's made him loopy.

Datatek · May 9, 2015

The secret of perpetual motion discovered, a diesel that goes faster with less fuel

Quick patent it.

Marmaduke · May 9, 2015

Datatek said:
The secret of perpetual motion discovered, a diesel that goes faster with less fuel
Quick patent it.

Given how cack the brakes are on a tratter you might have trouble stopping the thing, be fun to watch though[emoji3]

lightning · May 9, 2015

It can't run away due to lack of fuel alone, something else must have caused it.

All l can think of that the engine may be worn, and burning some sump oil as well as diesel, then maybe if it gets low on diesel it loses the control provided by the diesel pump, just running on the sump oil blowing past the piston rings?

tottot · May 9, 2015

blue beasty said:
I doubt that. A diesel needs more fuel to increase revs, it's not like a petrol where they will rev up just as you're running out.

Diesel engines do rev up as they run out of fuel [ at least older types do] then start missing before stopping.
Could be there is a pin hole near the bottom of the fuel pickup letting in just enough air to weaken the mixture and rev's then increase.

fanatic · May 9, 2015

tottot said:
blue beasty said:

I doubt that. A diesel needs more fuel to increase revs, it's not like a petrol where they will rev up just as you're running out.

Diesel engines do rev up as they run out of fuel [ at least older types do] then start missing before stopping.
Could be there is a pin hole near the bottom of the fuel pickup letting in just enough air to weaken the mixture and rev's then increase.

Click to expand...

wtf compression ignition, only possible reason would be erratic fuel pressure affecting base idle or governor

Found a solution to diesel runaway.

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