sorry if i was confusing in my last post.

basically - to check to see if the fuel pump is primeing the system, do the following:

turn key to the on position. you should hear a "humm" sound coming from the back of the car for about 2 seconds. it should then stop "humm"ing. If you can't hear it humming, the fuel pump is not primeing the fuel system. in this case, it could be a) bad Fuel Pressure Regulator b) bad PCM c) fuel pump d) fuel filter

if the humming is constantly going, my Haynes manual states its almost certainly a problem with the PCM. I had that issue very recently and I replaced the fuel filter (easy and cheap and it was due anyway) and check the Superchip (it was duct taped down but I was still able to move it a bit). Car is running fine so far.

hope that helps.





Hugo ------ 98 SVT - 53k mi - SOLD 04 Mazda3 S 5-Dr