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This would depend on whether the fuel pump is electric or mechanical. Most fuel pumps nowadays are tested with a fuel pressure gauge by connecting the tester to the SCHRADER valve on the fuel rail located on the intake manifold in the engine compartment. In lieu of this, pull a fuel line off the fuel filter on the fuel pump side (if electric pump) and check the flow when turning the ignition ON.

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Q: How do you check the fuel pump on a 1986 ford ranger six cylinder four wheel drive is working?
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