If there are 73 questions, then you could potentially miss all 73 of them.
40
73
about 600 amps
You would need to answer 52 questions correctly out of 73 to pass with a 71%. That means you could miss a total of 21 questions.
Injectors could be bad
If it is not diesel, you probably have a fouled or disconnected plug.
It is likely an injector problem which would require you to replace the injectors.
You would have gotten 73% of the questions correct, which in most places would get you a C.
73 questions on the test, all worth the same credit. Score 79% means you got -- 58 correct (79.452%) -- 15 wrong (20.548%)
Generator will not run or miss very badly. Drain all the fuel out and drain the lines. Replace the fuel filter and fill it up with Diesel.
The maximum speed of a 1973 Dodge 200, diesel 4 cyl, 73 HP pick-up is 81 miles per hour.