Fuel System Help with Zetor 5211

[CraigPrusansky]

I am posting this on a few different forums, so if you have seen this already, please forgive the duplicate post.

I have a Zetor 5211 that recently died in the middle of bushogging the pasture. It acted like it ran out of fuel, but it had over 1/2 a tank full. I had a mechanic come out and the fuel filter, fuel pump, and check valve were all replaced. The bowl is fine. I checked all of the hose clamps that I could see and they are all tight with no signs of leakage or air coming in. I also drained the tank and checked the pickup lines, and I saw no evidence of cracks or damage, or debris plugging them up. The fuel cap was also cleaned and I made sure that the vent holes were clear and the springs in the cap are working. When I prime the fuel system, it runs for about a minute and then dies.

The mechanic seems to have lost interest in troubleshooting any further. Is there anything else I should check, and are there any other connectors or things that should be looked at that I cannot see (hidden behind the engine, etc.)? Any assistance would be greatly appreciated.

 

[Peter 315]

You check the air filter if its starving for air it won't run......:confused3:

 

[pycoed]

Check my replies on Yesterdays Tractor site :-
Zetors with the tank below the prime pump are plagued with air leaks that cause just this problem (I have a 7045 - ask me how I know!)
The prime pump works fine for the earlier models with a tank in front of the dash.
Three cures are available:-
1 Renew every bit of hose between the tank & primer, check the metal lines for leaks, don't forget the return hose & metal line & also the one between the injection pump & the block. replace all the copper washers on the banjos too. (this is what I did)
2 Fit an electric lift pump via tank & primer/bowl (or remove primer/bowl & replace with electric & inline filter) Pump will need to supply about 10psi,
3 Fit a "Tigerloop" as installed to domestic oil boilers (furnaces in US?)where the oil tank is below the boiler pump. Essentially this is a clever design is de-aerator which reportedly completely cures the problem. Can get new for about 40 in UK or S/H half that on Ebay.
Good luck & Merry Christmas

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Pycoed
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PostPosted: Fri Dec 25, 2020 6:15 am Post subject: Re: Fuel System Help with Zetor 5211 Reply to specific post Reply with quote

PS
The bowl gasket is a common source of air leaks too - may be worth a smear of Holdtite on a new one. Don't just screw up the nut harder to fix it - fit a better gasket if you suspect that.
These air leaks can be a bugger to find- diesel doesn't always leak out where the air can get in!
It took me several goes before I got mine airtight & if it ever plays up again, I'll go straight to a Tigerloop, which seems the best solution to me, since it's specifically designed to cure this sort of problem.

 

[Bayfisher]

the 5211 came stock with a screen filter on the fuel pump, a primary and secondary fuel filter, "so" three should be serviced.

bleed the air from the fuel system all the way to the injection pump fuel inlet @ the backside of the injection pump,
then bleed the air from the injector pump at the fuel return line bleed, this will remove the airlock in the injection pump,
then loosen all three hard lines at the injectors, bleed the air from all the lines @ injectors, the engine should start.

 

[CraigPrusansky]

It's been a while, but I fixed the issue and wanted to post it here.

Per the service manual, when the system gets old an electrical auxilliary fuel pump needs to be added. I called and the recommended one was a Walbro GSL-392 electric pump. I got an off-brand one (because the Walbro brand one was not in stock) and that fixed the problem. I installed it between the fuel tank and the fuel filter and wired it to the ignition. It has been running good for about 3 years now since I did that.