30amp fues is a large fuse to be blowing... it means you have a serious problem. putting in a 40A in not the solution, it may have just caused you much bigger problems now.

If you had no fuel pressure (fuel pump) and no spark (ignition) then the next place to check is the ASD relay, if you have one. What year was this vehicle again?

 

95 4.0 i didnt leave the 40 in it, it also has pressure at the rail now..

 

auto shut down right?

 

auto shut down relay seems to be good its click when tested

 

just put a new 30a in started for a second blew fuse and died

 

You need to track down the short to ground.

 

trying... its a pain

 

would the ground on the block to the fire wall have anything to do with this?

 

it could. If a circuit is trying to complete it's path to ground and that ground has picked up a large amount of resistance (from being loose, corroded, or missing and it's trying to connect back through another component) then that will cause the circuit to draw more current- possibly blowing a fuse.

 

i unhooked the computer and turn the ignition to on and the fuse did not blow does this mean my ecu is bad i followed the wire from the fuse box to there

 

I had a no spark problem on the 90 4.0 I have been fixing up and it was the center wire going to the coil. The wire was burnt in half inside the connector.
Thought it might be worth checking out
clint

 

thanks ill swap it out just in case

 

fixed it a wire to the fuel pump was broke gounding it out on the frame causeing the engine control fuse to blow which was the reason for no spark. thanks everyone for you input!

 

Nice!

 

best part was it didnt cost me anything!