Hello and Welcome to Justanswer, My name is XXXXX XXXXX X am here to try and assist your with your question.

Unfortunately the problem you are describing is a very common on the 1991 460 and its is in most cases caused by a failing fuel pump (in tank) and this usually always happens in warm weather. When the pump begins to fail, it will over heat and this causes the fuel to foam and the engine will stall. Often times, once its had a chance to cool down it will start and run again. The place to start to be sure, is to install a fuel pressure gauge to the fuel rail service port and monitor fuel pressure while the problem is occurring. You need to see 32 to 45 PSI, anything less means you need a new pump.


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