Gasoline is rated by "octane," and most people think higher is better, right? Octane is a measure of how hard it is to get the gasoline to auto-ignite, because the last thing you want in your gasoline engine is premature ignition. Diesel is the opposite. It's rated by "cetane" which is a measure of how easily it auto-ignites, which is what you need for a good running diesel. A tiny bit of gas mixed with a whole lot of diesel won't do much besides lower the cetane number, it may make the engine harder to start, especially cold. A lot of gas will mean the engine won't run at all.
On the other hand, your injection pump is probably not designed to handle either gasoline or alcohol. If the seals in the injection pump get dried out by alcohol, or dissolved in gasoline, that would be a major problem. Injection pumps are expensive.
Personally I wouldn't risk it. I'd pump out the gasoline into a container (probably easiest to disconnect a fuel line and just turn the key to run) and then refill with diesel.
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