According to Haynes...
On 7.5L non-EFI models with "Hot Fuel" option, disconnect start wire at the starter relay and have an assistant hold the key in the START position/ The in-tank fuel pump should be heard running. Rconnect START wire at start relay. If no sound is noted, repair the circuit.
It goes on to say...
On 7.5L non-EFI models with "Hot Fuel" option, locate teh oil pressure switch on the engine and disconnect the electricl connector. Jumper both red/yellow wires together at the connector. Turn the ignition key to the RUN position. Now the pump noise should be constant. Listen specifically for the following:
1) In-tank low pressure pump.
2) on dual tank models, switch tanks (key on) and verify operation of alternate in tank pump.
It goes on for pages about how to check the fuel pressure regulator.
Also it mentions fuel supply line restriction and clogged fuel filter as cause for low pressure at the carb.
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BroncoJoe19
2006 Alt Fuel Jeep (electric)
'98 windstar 3.8L
'99 Crown Vic 4.6L
'90 Full Size Bronco 5.0L
I'm not a professional mechanic, take my suggestions with a grain of salt, or a cup of coffee  If you found this post helpful, please click this  on the left of this post.
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