I have a 98 Volvo 7.4GI that for the very first time in 270 hours left
me stranded. The boat ran at about 3000 RPM for 10 minutes and then
cut completely out. It would crank but not start and it did not
appear either fuel pump was running based on the lack of that audible
pump whine when you first turn on the key. I checked all the circuit
breakers and swapped in a new fuel pump relay. I also reseated the
power lead to the low pressure pump. All of a sudden, seemingly
related to my reinsertion of the LP FP relay, the pumps started
working again. It now runs between 5 and 25 minutes and then cuts out
again. When it cuts out both fuel pumps are not running. Also when
it is running, the LP FP gets very hot while the HP FP stays cool.

I know that the "pump on" signal comes from the computer. I also know
the pump should not be getting as hot as it does. Is there anything
in the computer that would trip when presented with the higher load of
the LP FP and perhaps shut off the fuel pumps? My issue is that if
the LP FP is bad, I can understand that, but why would the HP also
stop working?

I do not have a code extraction tool so have been unable to determine
if there are any stored codes... anyone know how to pull the codes
with a test light or something similar?

Thanks for listening and thanks for any help or suggestitions.

Terry