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If my low pressure in tank pump works but the frame high presure pump doesnt will the guage read 0 psi? Trying to figure what needs fixed, power to both uunits.

86 Bronco 302 EFI
 

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If the high pressure on the frame rail is dead + a semi clogged fuel filter you will not see any pressure at the rail. Just a slight dribble out the schrader.

You can see if the low pressure is functional if you pull the fuel inlet going to the high pressure and hit the key to on. You'll see it squirt. Its low pressure but have a big can to catch the fuel in. it does fly out.
 
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