How do you know if your fuel pump is working properly in a 89 mitsubishi triton

Should be located under the hood in the left hand side fuse compartment. looking at wiring diagram and it does not show a fuse but i'm sure it will have one and generally its located near the relay

For other Mitsu's, and probably the Triton too, the ECU controls a relay that switches power to fuel pump. The action is also tied in with the IGN switch ie power to the ECU, which drives the relay. I suggest you locate the ECU box, and look for a large relay box near by. What often happens with older vehicles is the relay stops switching, sometimes because of an internal failure. If you find the relay box, you should be able to feel the relay click when the IGN Switch is turned. If the ECU is OK, all the relevent dash lights should turn on.

the tachometer ( rev counter) get its impulses from the ignition system or in the case of a diesel from the crankshaft position sensor
if it runs with introduced fuel ( dangerous for a diesel) but then dies, that indicates insufficient fuel pressure to the injectors
could be a diesel pressure pump ( test to 25,000 psi) not producing sufficient pressure to work injectors
problem fuel supply to pump, tank venting, filters , air in system etc

Drum brakes. Could be the e brake cable rusted and holding the brakes to close to the drum. Or the brake parts has fallen apart inside the drum.

relay is usually found under the hood and fuel pump is in the tank
more and likely it would be a fuel pump test your fuel psi. first

One way is to remove the tank. You may also siphon the fuel out with a siphon hose and pump. Usually you can get this at your local Auto Parts store.

check the crankshaft position sensor

You can get them at E-Bay.

hi i have the same problem with my 89 triton and changed the head and everything you have did you work it out .i heard the carbys are notorious for stuffin up

does your regular service includes the injection pump being brought down for cleaning and maintenance?

it is an injection pump problem. inside the injection pump are valves and strainers that are not accessible for regular users. they could only be cleaned or replaced by these people who work with injection pumps and they would calibrate the injectors also so that it would not be blowing black gas and uses excessive fuel.

tnx 4 using fixya,

drcool