Forum Discussion
MEXICOWANDERER
Feb 26, 2016Explorer
Test fuel pressure yourself using a good gauge and stout fuel line connector hose. I've caught too many garage mechanics using dartboards and guessing and this makes what little hair I have left stand up on end.
Stage one. Check fuel pressure. If it drops, check voltage at pump. If it drops as well, check amperage. If amperage raises while delivery falls, it's the pump. If voltage drops along with amperage, trace it backwards to the relay. Check incoming and outgoing voltages at the relay. Then check, if necessary, the relay -coil- control voltage. Don't forget to check the relay grounding circuit for the relay coil operation.
This will tell you without a doubt yes/no that a problem does, or does not exist in the fuel pump electrical power and control circuits.
Stage one. Check fuel pressure. If it drops, check voltage at pump. If it drops as well, check amperage. If amperage raises while delivery falls, it's the pump. If voltage drops along with amperage, trace it backwards to the relay. Check incoming and outgoing voltages at the relay. Then check, if necessary, the relay -coil- control voltage. Don't forget to check the relay grounding circuit for the relay coil operation.
This will tell you without a doubt yes/no that a problem does, or does not exist in the fuel pump electrical power and control circuits.
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