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The insurance company engineer looked at it and is doing some more research. Most of the flames were on the r/f side of the engine where the power line runs to the starter - the line may have rubbed against an improperly placed clamp and arced to cause a spark that then ignited fuel. Since the engine died suddenly right before the fire and there was no electrical smell, that could be it. It felt to me while driving like a fuel or injector line blew and spewed gas on the block but the forensics guys seem to know a lot more about figuring these things out than I do. They sould have a report early next week.
Several things.

First don't just assume the engineer knows what he is talking about.

The power line or battery cable to the starter is located at the right rear of the engine were the starter is. There is no main power cable at the right front.

In reading your first thread about this.

The pop you heard was the fuel vapors igniting. A popping noise is a sign of vapors igniting. Much like lighting your propane grill without opening the lid.

There is not much on the right side that will instantly ignite fuel. An example fuel sprayed on a hot exhaust manifold will ignite real quickly with out much noise. There is nothing really hot on the intake side.

From looking at your picture of the motor. It looks like the hottest part of the fire was right at the fuel pressure regulator at the end of the fuel rail. In the picture it looks like the fuel hose popped off the regulator. Then a spark ignited the fuel vapor then from there it just burns. The source of the spark was probably the distributor.

This is why on boats everything that can produce a spark either has a flame arrestor or is shield.

This is based on my 10 or so years of working professionally on Alfas and seeing and parting out many burned and wrecked ones and the last 16 years working on boats were fuel vapors are very very dangerous.

I hope this might help you out.

As far as salvage value. It usually 15 to 25 percent of what the insurance is going to pay you. So if they were going to pay you a 1000.00 and keep the car. Then tell them you want to keep the car and they would give you at least 750.00 or more and the car with a salvaged title. A lot of insurance companys would rather you keep a car like an alfa as their getting more for the car from you then they would at the insurances auctions.
 

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When the 944 went it was a fairly major "Kaboom" and the car shook like a bomb had gone off underneath. Used a lot of fire extinguishers. No insurance for that. Just sucked it up. I agree with the fuel initiating the blaze from what I can see in the pictures. Everybody needs to inspect those old fuel lines!
Yes. The more fuel vapors there are the bigger the boom.
 
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