Valtra 6400

[woody paul]

Used tractor this afternoon and just wouldn't pull after a while, limped it home at 20kph with foot flat on floor. 

Open drain on first filter housing and could hear gurgling. Me thinking lift pump fault, or anyone get another idea. 

Filter is only a year old. 

[GarethM]

Gurgling as it drained back onto the tank you mean ?.

 

Which would indicate it's feeding back and therefore not holding prime, as the fuel should stay put even with the filter removed, that's why you manually prime and preferably also fill the new filter before firing up any diesel.

 

Lift pumps are cheap, do the filters whilst it's apart as you never know what's gone where.

 

Plus fuel filters are like a tenner, change regularly if you're getting fuel from unknown sources and approx 250 hours.

[openspaceman]

1 hour ago, woody paul said:

Used tractor this afternoon and just wouldn't pull after a while, limped it home at 20kph with foot flat on floor. 

Open drain on first filter housing and could hear gurgling. Me thinking lift pump fault, or anyone get another idea. 

Filter is only a year old. 

You don't say what came out of the drain. A not infrequent thing with my counties was the sock  on the fuel tap in the tank collapsing when it gelled up with diesel bug.

[woody paul]

30 minutes ago, openspaceman said:

You don't say what came out of the drain. A not infrequent thing with my counties was the sock  on the fuel tap in the tank collapsing when it gelled up with diesel bug.

Nothing came out just heard gurgling. 

[GarethM]

As it drained back into the tank ?.

 

Okay, if you crack the fuel filter and crank the lift pump does fuel immediately flow out or does the whole pipe need to fill again ?.

[Conor Wright]

Pure guesswork here as im not familiar with them but Is there a breather on the tank to allow air in as it empties? gurgling sounds like there could be a vaccuum in the tank.

Could it be "pulling" on the lift pump if it's blocked with dust and chip, making it appear as though the pump is weak.

 

Could it be dirt on the lift pump gauze?

 

Partially blocked fuel line?

probably worth giving the lines a blast with the compressor, back towards the tank, so not to push dirt towards the injector pump.

 

Probably nothing in the above you havent considered already.

 

@s o c has one, he may be able shed some light on the issue.

[woody paul]

12 minutes ago, GarethM said:

As it drained back into the tank ?.

 

Okay, if you crack the fuel filter and crank the lift pump does fuel immediately flow out or does the whole pipe need to fill again ?.

Will do more checks in day light. 

Once I had undo drain and gurgling happened, ran it up road and seamed OK, but will give it more of a run. 

[swinny]

I'd also look at the fuel lines for cracking... also heard of them de laminating inside and closing up but never seen this myself

[Stephen Blair]

There’s a banjo bolt just before the filters, that can clog up if there’s crud in the tank.  Had us fooled for a few days before we found it on a 8150 years ago.

[woody paul]

So. Everything is clean, fuel pump primes up first part by hand then turn it over and it self bleeds. Ran it up road and still same, next was air cleaner, clean. 

So sitting having lunch thinking, this has all arised after I remove immobiliser, so next is check power to stop solenoid,