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An expert who has answered 20 questions.
Re: blows ignition fuse
You'll want to check the coil packs on the engine by disconnecting them, one at a time, and temporarily replacing the fuse with a circuit breaker of the same rating. Try starting the engine with one coil disconnected (leave it on the engine, but disconnect the wire). If it stays running (though poorly) with a coil diconnected without tripping the breaker, you've found the bad coil and you can replace it easily.
Other than this, take the car into a competent mechanic to diagnose as many electrical issues involve sensitive electronic parts.
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You have a Chrysler , dodge , or Plymouth ? ASD Fuse supplies power to ASD relay ,if you have a Dodge , Chrysler or Plymouth vehicle . You have a short to ground , videos on you tube , how to find a electrical short ! ASD - auto shut down , this powers Ignition system , fuel injectors , O2 sensors . A short in any one of these systems will blow the fuse . O2 sensor wires get melted on exhaust pipes an manifolds ! That is if you have one of these make vehicles !
I had a similar problem where the battery was ok
but there was no sound from the starter and also there no lights on in
the dash when the key was turned. Checked the fuse and checked wire
from the fuse back to the ignition switch. The wire from the fuse was
ok in fuse box but had no voltage at the ignition sw. The was also no
voltage to terminal 30 in the starter relay. Ran a new wire from the
fuse to the ignition and it fixed everything. Check for voltage at
terminal 30 on the starter relay
Bad ignition switch? Maybe? I have the same problem and I'm going to replace the ignition switch today before I start trying to trace electrical issues (which could be anything and take forever).. Hoping the switch is the fix...
Was the old fuel pump bad? It might be worth the cost to replace the ignition switch. The wires to the fuel pump would be a second guess if the old pump was bad and burnt the wires before the fuse went. When you eliminated the fuel pump you also eliminated the wires to the pump and it started. Then you replaced the pump, but not the wires. The ignition switch is the other end of the circuit.
Check the fuel shutoff valve. to see if it is on. press the reset button to do this. if it stays on. The answer could be pinched wires (a short) from the fuse wiring back towards the shutoff valve. if the valve shuts off try checking for current with a test light. if no current . The valve is bad. it seems like a short or open circuit on the fuel system wiring.