Purpose: restore correct fuel delivery and combustion by removing water, sediment and deposits, restoring unrestricted flow and airtight seals, and recovering injector spray quality. Symptoms fixed: hard starting, stalling, loss of power, surging, smoke, excessive fuel consumption.

Precautions (do first): wear gloves/eye protection, work outdoors or ventilated area, stop engine and disconnect battery, shut fuel petcock if fitted, collect and dispose of diesel/contaminants legally, avoid open flames.

Ordered procedure with theory and how each repair step fixes faults:

1) Observe symptoms and locate components
- Action: identify tank, pickup, sediment bowl (or strainer), primary filter, lift (feed) pump, inline/secondary filter, injection pump and injectors.
- Theory/fix: understanding where fuel passes lets you target the restriction/inlet contamination or air leak causing the fault.

2) Drain water and sediment from sediment bowl / drain cock
- Action: open drain(s) and remove water and heavy sediment from bowl(s) or inline clear bowls until clean fuel flows.
- Theory: water and heavy particulates collect in bowls/low points. Water does not compress and causes poor combustion, corrosion and injector damage. Draining immediately removes the worst contamination.
- Fix: restores clean liquid fuel supply preventing injector wear, misfires and poor combustion.

3) Replace primary (paper) filter or clean glass bowl and element
- Action: remove/replace the primary element (or clean the glass bowl and mesh) and seals/gaskets. Use correct part.
- Theory: the primary filter traps fine particles that restrict flow. A clogged element increases suction at the pump, causes cavitation/air draw and reduces fuel available to the injection pump.
- Fix: restores free flow and proper pump inlet conditions, eliminating surging, loss of power and hard starting caused by starvation.

4) Inspect and clean tank and pickup screen
- Action: if contamination is heavy or the tractor has sat long, siphon or remove tank, flush with clean diesel, wipe sludge and clean tank pickup strainer/screen.
- Theory: sludge and microbial growth (“diesel bug”) cling to tank walls and recontaminate filters; pickup screens can be clogged.
- Fix: removes recurring contamination source so new filters remain effective and prevents rapid re-clogging.

5) Inspect, clean/replace feed (lift) pump filter and check pump operation
- Action: remove the lift pump (mechanical diaphragm on these tractors) or its filter/screen, clean the inlet strainer and check valve, reassemble with new gaskets. While removed, prime and watch flow.
- Theory: the lift pump supplies the injection pump at low pressure. Dirty inlet screens or a weak/leaking diaphragm reduce flow and can draw air. Internal check valve failure allows backflow and air ingestion.
- Fix: restores steady feed pressure and flow to the injection pump, eliminating cavitation-related roughness and starting issues.

6) Check and eliminate air leaks in fuel lines and fittings
- Action: inspect all fuel line joints, banjo bolts, hose clamps and rubber hoses for cracks/loose fittings; tighten or replace; smear shown and prime to verify no air ingress.
- Theory: diesel systems are sensitive to air. Even small leaks cause aerated fuel, vapor lock and poor pump/injector performance.
- Fix: prevents intermittent cutting out, rough running and long cranking due to air in system.

7) Replace inline/secondary filter (and O-rings)
- Action: replace the final filter element before the injection pump (spin-on or cartridge) with a genuine/new part; replace seals.
- Theory: this is the last contaminant barrier. A partially blocked secondary filter restricts fuel under demanding load and stresses the injection pump.
- Fix: restores full flow to injectors and prevents starvation under load and poor atomization.

8) Bleed and prime system in correct order
- Action: open bleed screws (at filter housing and on injectors if present), operate lift pump or cranking to prime until all air is expelled and firm fuel arrives; close bleeds; test-run briefly and re-bleed if necessary.
- Theory: removing air re-establishes a continuous liquid column; the injection pump and injectors require liquid fuel to develop injection pressure and correct timing.
- Fix: eliminates hard starting and stalling due to vapor/air in lines.

9) Inspect injection pump inlet screen and lines; clean if required
- Action: where accessible, remove and clean any fine inlet screen ahead of the injection pump; inspect lines for blockage; do not disassemble the injection pump unless qualified.
- Theory: a partially blocked pump inlet causes cavitation and pressure loss inside the pump, degrading timing and flow pulses.
- Fix: restores stable pressure pulses and timing consistency, improving idle, response and power.

10) Test injectors and repair/clean as necessary
- Action: check injector spray pattern and opening pressure on a bench or by a workshop: look for dribbling, poor spray cone, or inconsistent flow; clean ultrasonically or replace if worn.
- Theory: injectors atomize fuel; deposits or worn seats/nozzles give poor spray, fuel dribbling, uneven cylinder filling and incomplete combustion (smoke, low power).
- Fix: restoring correct spray pattern and opening pressure recovers combustion efficiency, reduces smoke and returns power and economy.

11) Run engine, observe and fine-check
- Action: after reassembly and full bleeding, run at idle and under load; watch for leaks, smoke, uneven running. Re-check filter elements and bleeds after short run.
- Theory: real-world verification ensures the system is supplying stable fuel under operating conditions and no new air or leaks appear.
- Fix: confirms the cleaning/repairs corrected the fuel delivery faults.

12) Preventive actions
- Action: use clean fuel, change primary and secondary filters at recommended intervals, keep tank above minimum to limit condensation, use a biocide if microbial contamination is recurring.
- Theory: contamination often returns from dirty fuel or tank water; regular maintenance prevents recurrence.
- Fix: extends time between failures and keeps the system operating properly.

Notes and cautions:
- Do not disassemble the high-pressure injection pump unless trained. Internal work requires calibrating equipment and re-timing.
- Injector testing/cleaning ideally done on a bench; replacing injectors is often more reliable if spray or pressures are poor.
- When replacing parts, use correct seals and torque to avoid air ingress.
- If after cleaning symptoms remain (weak pump, damaged injectors), component replacement or professional pump service will be required.

End.
rteeqp73

How to drive a tractor - Massey Ferguson Hi guys. Welcome to this video where I am gone teach you how to drive a tractor. I give all of the operational-, start-up, turning- ...

How to fill transmission/hydraulic oil on Massey Ferguson 240 tractor After my video when I need to fix the PTO fork I needed to fill it up with oil since it leaked out an bit under the reparation.

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