Some of your conclusion is whacky. Leave the fuse in. The starting fuel running engine for longer even when pump SHOULD be running is further proof of bad fuel supply as in the amount and pressure.
'If the engin will run on starting fluid, than gas is contaminated.'
That has several things wrong with it. Why you grill the son, diesel didn't get there by accident, he would know, the gas cap is locked to not be messed with. You can smell diesel in normal gasoline. Fouled plugs ARE an electrical issue but not one you chase wiring with, and they can make that start to quickly stop symptom all day long.
Having the fuel pump fuse in place also lets the ether run the engine possibly long enough to somewhat unfoul the plugs and then regular fuel supply kicks in to take over and engine stumbles around for a bit then begins to clear out and run better if all that is wrong is heavily fouled out plugs. Fuse out it doesn't happen. The ether is used to not only start the engine but keep it running long enough the fouling burns out during it.
You should be aware that modern MPFI cars now are harder to light off with starting fluid and the explosion risk is MUCH higher as a result too. The older cars had much smaller intake manifold volumes that required much less ether to light off the engine, now they are much bigger due to the manifolds only carrying air and not fuel. The normal 2 second MAX ether shot that would start an older car is usually not enough and you must use a much bigger shot to cover the increased air volume there and then the explosion risk goes way up. Even more so if you do NOT pull the plugs to look at them to see if they are WET. When wet they short down the side of the insulators and why the engine pops off to run for a second then dies, the cylinders are too rich. The shorting spark is not hot enough and then produces a weak partial only ignition of the mixture that burns slow as a result to let the engine backfire into the intake and normal for fouled plugs to do that all day long. Except for the fact that the intake is now full of ether. What happens next? The intake explodes and possibly into many pieces, seen it more than once. Can easily kill somebody.
Why slow methodical absolutely correct thinking in proper order needs to take place whenever using ether. BTDT. Those problems did not exist on the older cars unless an idiot was working on them. No insult intended there at all of course, just that safety is always more important than whether the car gets running.
Make ABSOLUTELY sure the plugs (ALL) are BONE DRY before using ether there. If they already are dry you likely still have a fuel supply issue if you have already been trying to start it for a while.
Last edited by amc49; 04-14-2019 at 12:20 AM.