The best diagnostic for the fuel pump is a pressure test. Need to know the specs on it (should be around 40-60 PSI), hook it up to a fuel pump tester and there you go.
The symptoms the engine presents when a fuel pump is going bad could include:
- hard to start
- hesitation
- loss of power upon acceleration
- going dead at idle
- others...
But other problems could cause these same symptoms.
Charlie
The car will not accelerate well and movement will be sluggish.
When you turn the key on, the pump should run for a short time and quit. If it continues to run, then it's not building pressure, or the pressure regulator is bad. Measure system pressure on the fuel rail over the injectors--it is a tire-valve looking fitting. The pressure should be about 50 PSI more or less. Have the engine running when you make the test.
The usual symptom is an engine that turns over but won't start, the other less common symptom is a loss of power from a slow turning pump, this causes low fuel pressure.
The cheapest and easiest way is to have it pressure tested through a shop
Mercury Marquis Fuel Pump IS A 94, BUT IT IS THE SAME FOR BOTH YEARS.
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