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Old 06-09-2019, 03:16 AM   #1 (permalink)
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Default SANTANA Samurai - Does the ECU cut fuel in case of overheating?

Good morning forums,

I'm having trouble with my Sammy, as always, and I can't make heads or tails of what's going on.

Read on if you'd like, and if you have similar experiences, I'd like to hear them!
My Sammy is a Spanish SANTANA/SUZUKI SJ SAMURAI 1999, 70hp G13BA engine, 140,000km

After completely rebuilding my front axle and changing all 6 u-joints, I put in a fresh tank of fuel, drove 100km on the highway at 3000-3500RPM, and suddenly lost all engine power.
Rolled to a stop, then got towed.
Trip was also under the scorching midday Greek sun, if that has any significance.

Nothing seized, wheels were all rolling. When I rolled to a complete stop, the engine shut off, and wouldn't start again.

Spark plugs were fine (new), distributor and multiplier was sparking just fine while the ignition was turning. Air intake was fine (new).
Note: fuel pump is also new, I've done 1000km on it, only in-city, max 2500RPM).

Opened the throttle, sprayed starter fluid directly, engine started just fine. So it was a fuel problem.

We raised the Sammy at the garage and checked if we messed up fuel lines while disassembling stuff for ujoint and axle rebuild. All were fine.

Next day, I put a fuel cleaner additive in the tank, I use my second car key, and the damn thing starts up just fine, and holds idle just fine.
I drive it home, then at night I go out for a 10 minute drive - and the engine shuts off again mid-drive, fuel starved. I go to open the hood and it's SCORCHING, as in I'm uncomfortable touching it, after a 10 minute NIGHT drive. I don't think it's ever been that hot.

Two things:
Does the ECU shut off fuel supply if it detects overheating, in Santana Samurais? Couldn't this be the case? My radiation is old and very corroded.
Could also be a defective fuel pump, even though I changed it 2 months ago. How prone are they to being factory defective?
One of the mechanic suspected an immobilizer problem - if the immobilizer also shuts off fuel supply - but I tried with both keys that were given to me by the previous owner, and the problem came with both.

Any ideas, gentlemen?
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