Fuel INJ Fuse Keeps Blowing!!!

MX3_V6 · Post by **MX3_V6** » January 14th, 2006, 5:03 pm

the fuse that is located under the hood.. its a 30A Fuel Inj Fuse..and for some reason..it keeps blowing now..when the car ran perfect..2 seconds before it stalled...its a 1993 MX3 1.8v6.5spd....i just spent 300$ at the mazda dealership i was at..on plug wires..n bearing..but when i went to leave..it died..unfortunaly they were closing and my car was getting locked around back ,so i couldnt play with it other than jiggle some wires and try a few fuses..5$ each!! if nebody has ne suggestions..as wat to try...when i go back on monday..that would be helpfull..,im going to ask the mechanics that werk there for suggestions..aswell.

FlyVFR · Post by **FlyVFR** » January 15th, 2006, 9:27 pm

This thread may help a bit. I believe Grants has a few good pointers.

http://mx-3.com/phpbb2/viewtopic.php?t=48214

93_mx3_gs · Post by **93_mx3_gs** » January 15th, 2006, 9:42 pm

Kinda off topic but how do I release the pressure for the fuel system so I can stick a new filter in ?

Just pop the gas cap ?

FlyVFR · Post by **FlyVFR** » January 15th, 2006, 10:39 pm

93_mx3_gs wrote:Kinda off topic but how do I release the pressure for the fuel system so I can stick a new filter in ?

Just pop the gas cap ?

I would follow the procedure in the online shop manual.

BTW - poping the gas cap only lets out gas fumes from the tank.

93_mx3_gs · Post by **93_mx3_gs** » January 15th, 2006, 10:57 pm

FlyVFR wrote:
93_mx3_gs wrote:Kinda off topic but how do I release the pressure for the fuel system so I can stick a new filter in ?

Just pop the gas cap ?
I would follow the procedure in the online shop manual.

BTW - poping the gas cap only lets out gas fumes from the tank.

Didn't see anything about pressure release procedure in the manual. I checked F2 - 109 or something like that for fuel filter replacement.

On topic : Look around the fuse block housing for damaged wires and what not that may be arching and grounding out.

PATDIESEL · Post by **PATDIESEL** » January 16th, 2006, 1:53 am

To release the fuel pressure just pop the gas cap and pull the FI fuse. Some will still squirt out when you pull the line, but not much.

MX3_V6 · Post by **MX3_V6** » January 21st, 2006, 11:58 am

Ok..i figured out wat the problem was, after i went to mazda to play with the wiring , with a hand full of fuses..! 1 hour goes by,i counldnt figure it out..after i unhooked the injectors,chopped a few wires,,and pulled off alot of tape.. to trace some wires.... so i rented a dolly and towed it home, and looked around some more and kept unhooking stuff ,,until it would stop blowing fuses, Finally!! after i had almost everything unkooked,,i narrowed it down to the Rear O2 sensor.! i suppose the heating element had collasped and was causing a nice short!!!

FlyVFR · Post by **FlyVFR** » January 21st, 2006, 3:26 pm

That's some good troubleshooting. Saved yourself a few $$ also.