TOHATSU MFS 40A User Manual (English)

Questions and Answers:

T
Tyler FitzgeraldAug 21, 2025
What to do if my TOHATSU MFS 40A is difficult to start?
- L
  loganrhondaAug 21, 2025
  If you're having trouble starting your TOHATSU Outboard Motor, it might be due to several reasons related to the fuel system. Begin by checking if the fuel tank is empty and fill it with the proper fuel. Ensure the fuel system connections are correct and inspect the fuel line for any leaks that could be letting air in; seal these as necessary. A deformed or damaged fuel hose should be replaced. Also, confirm that the air vent on the fuel tank is open. Furthermore, the fuel filter or fuel pump might be clogged, requiring cleaning or replacement. If problems persist, the fuel pump itself may be malfunctioning, suggesting a need for service or replacement.
S
Stephen KramerAug 22, 2025
Why is my TOHATSU Outboard Motor difficult to start?
- M
  Mr. James DawsonAug 23, 2025
  Several factors can cause a TOHATSU Outboard Motor to be difficult to start: * The fuel tank may be empty, in which case you should fill it. * There might be an incorrect connection in the fuel system, so verify all connections. * Air could be entering the fuel line; check for leaks. * A fuel hose might be deformed or damaged, requiring inspection and replacement. * The air vent on the fuel tank may be closed; open it. * The fuel filter or pump could be clogged, in which case you should replace them. * The fuel pump might be malfunctioning, requiring repair or replacement. * The fuel primer may not be supplying enough fuel, so ensure it is operating correctly.
D
Dr. Christina LongAug 25, 2025
What to do if the starter motor on my TOHATSU Outboard Motor will not crank?
- R
  Ryan LeeAug 25, 2025
  If the starter motor on your TOHATSU Outboard Motor won't crank, ensure the motor is shifted into the neutral position. If that's not the issue, the ignition key switch may have failed and need replacement. Alternatively, the starter motor or starter solenoid may have failed, requiring service or replacement.
M
Michael RollinsAug 26, 2025
Why is my TOHATSU Outboard Motor engine difficult to start?
- H
  holly00Aug 27, 2025
  If your TOHATSU Outboard Motor engine is difficult to start, several factors could be at play. First, ensure that your fuel tank isn't empty; if it is, refill it with the correct fuel. Also, verify that all connections in the fuel system are correctly made. Check for any air entering the fuel line and seal any leaks you find. If the fuel hose is deformed or damaged, replace it. Make sure the air vent on the fuel tank is open. Lastly, a clogged fuel filter or fuel pump could be the culprit, so clean or replace them as needed. If the fuel pump is malfunctioning, consider servicing or replacing it.
M
Mr. Bryan Nichols PhDAug 28, 2025
How to troubleshoot a TOHATSU Outboard Motor that is difficult to start?
- T
  tsmithAug 28, 2025
  To address a TOHATSU Outboard Motor that's hard to start, begin by ensuring the fuel tank has an adequate supply of the correct fuel. Then, carefully inspect the fuel system connections to confirm they are properly connected. Check the fuel line for any air leaks and seal them. Replace any fuel hose that is deformed or damaged. Verify that the air vent on the fuel tank is open. If the issue continues, the fuel filter or fuel pump may be clogged and need cleaning or replacement. Should these steps not resolve the issue, the fuel pump may be faulty, and servicing or replacement may be necessary.
B
bethany53Aug 29, 2025
What to do if there is a faulty thermostat in TOHATSU MFS 40A?
- M
  Michael WilsonAug 29, 2025
  If the thermostat in your TOHATSU Outboard Motor is faulty, replace it.
M
Matthew WhiteAug 31, 2025
What to do if my TOHATSU MFS 40A runs erratically?
- W
  williamwalshAug 31, 2025
  If your TOHATSU Outboard Motor runs erratically, several issues could be responsible: * Incorrect fuel system connections: Verify all fuel system connections. * Air in the fuel line: Check for air leaks. * Damaged fuel hose: Inspect and replace any deformed or damaged fuel hose. * Closed fuel tank vent: Open the air vent on the fuel tank. * Clogged fuel filter or pump: Replace the clogged fuel filter or pump. * Faulty fuel pump: Repair or replace the fuel pump. * Incorrect engine oil: Use the correct engine oil. * Improper gasoline: Use the correct type of gasoline.
M
mstewartSep 2, 2025
Why does my TOHATSU MFS 40A Outboard Motor have low engine speed or poor boat speed?
- L
  Lindsay DeanSep 2, 2025
  Low engine speed or poor boat speed in your TOHATSU Outboard Motor can be due to: * An empty fuel tank: Fill the fuel tank. * Incorrect fuel system connections: Verify the connections. * Air entering the fuel line: Check for air leaks. * A damaged fuel hose: Inspect and replace it. * A closed air vent on the fuel tank: Open it. * A clogged fuel filter or fuel pump: Replace the filter or pump. * A malfunctioning fuel pump: Repair or replace it. * Using improper engine oil: Use the correct oil. * Using improper gasoline: Use the correct type of gasoline.
J
Juan DelgadoSep 3, 2025
What to do if starter motor will not crank on TOHATSU MFS 40A Outboard Motor?
- L
  Lisa SmithSep 3, 2025
  If the starter motor on your TOHATSU Outboard Motor won't crank, consider these potential causes: * The motor might not be shifted into neutral: Ensure the gear is in neutral. * There might be a weak battery or loose/corroded connections: Check the battery condition and connections. * The ignition key switch could be faulty: Replace the ignition key switch. * The starter motor or solenoid may have failed: Replace the faulty starter motor or solenoid.
R
robertgallagherSep 5, 2025
What to do if my TOHATSU MFS 40A battery will not hold charge?
- J
  joshua57Sep 5, 2025
  If your TOHATSU Outboard Motor battery will not hold a charge, it might be due to a weak battery or loose/corroded connections. Check the battery condition and its connections.

TOHATSU MFS 40A Specifications

General

Horsepower	40 HP
Gear Ratio	2.08:1
Number of Cylinders	3
Displacement	866 cc
Fuel System	Electronic Fuel Injection
Starting System	Electric
Shaft Length	20 inches
Fuel Type	Unleaded Gasoline
Max. RPM	6000 RPM
Alternator Output	12V
Engine Type	4-Stroke