That little grey box is called a TFI module. Its purpose is to amplify the signal coming from the PIP sensor in the distributor (profile ignition pickup) to send to the E-core coil. Already proven good, as the engine will start and run on ether.
The problem here is that the fuel pump is not coming on when the key is turned on. That proves that the ignition switch, ignition module, and the entire ignition system is functioning properly.
The issue here now is to troubleshoot the fuel system.
What is supposed to happen is this:
When the ignition switch is turned on, the computer gets turned on. First thing is that it sends a signal out to turn on the fuel pump for a few seconds. This is to make sure that there is fuel pressure at the injectors for quick starting. When the starter is activated by turning the key to the start position, the starter engages and begins turning the engine. This produces a signal from the distributor that the computer reads. This signal is used by the computer to verify that the engine is turning, and turns on the fuel pump circuit. At this point, if everything is working correctly, the engine starts and runs.
In this case, the fuel pump is not running. Since the ignition system is already proven to be working, the problem is in the fuel delivery system.
Could be a broken wire. Could be a corroded connector. Could be a failed relay. Could be a bad or tripped inertia switch. And finally could be a bad computer.
What it is NOT is an ignition switch or ignition module. In this case, it has already proven good, so why point the guy in the wrong direction??
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Today's Featured Article - Tuning-Up Your Tractor: Plugs & Compression Testing - by Curtis Von Fange. The engine seems to run rough. In the exhaust you can hear an occasion 'poofing' sound like somethings not firing on all cylinders. Under loaded conditions the tractor seems to lack power and it belches black smoke out of the exhaust. For some reason it just doesn't want to start up without cranking and cranking the starter. All these conditions can be signals that your unit is in need of a tune up. Ok, so what is involved in a tune up? You say, swap plugs and file the points....now tha
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