Your 86 Mazda rx7 isn't getting the right vaults to the fuel pump Do you need a new fuel pump or could it be some wiring Or does it have a relay Please Help thanks?

Answer 1

measure voltage before it goes to the pump, either at the fuse of just before the pump. if voltage is for example 12v at the fuse then 8v after the pump then yes you need a new pump. if voltage is 8v at the fuse or before the pump then its not the pump and you have some other electrical issue.

not sure if they have a relay on your model dude, on a third gen you have (in order of electrical flow) the follwoing electrical components

Battery,

Ignition Switch,

Fuel Pump relay,

Speed Relay,

Fuel Pump Resistor,

Fuel Pump Fuse,

Ground located in boot (near pump) measure the voltage at each of these locations and you should be able to see where the fault is.