ECMB short

turbodog

turbodog

Donating Member
Hi, not sure if this belongs here or in Chassis electrical....

Was running fine. Pulled out of a parking spot, put it in gear, went maybe 10 feet and it died. Guage shows I have fuel pressure. ECMB (10A) fuse is blown. Pull my ELC (20A) fuse and stick it in the ECMB slot, it starts but stumbles bad and dies. Start again, same result. 3rd try, no start. the 20A fuse is blown. No recent work, has a Walbro with ~50k mi.

Pulled the wiring diagram up, looks like the circuits on that fuse are:
ECM
Oil Pressure Switch
Fuel Pump Relay
Antilock Brakes (deleted)

Am I missing anything?

Only other possibly relevant info... I have an oil leak, looks like rear main seal... but could be from oil pressure switch, down back of block. Is the switch back by the distributor, or is it on the driver side of the block, above the oil filter adapter?

Headin' out now to troubleshoot.... will check back in for any helpful hints.

Thanks.
 
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turbodog

turbodog

Donating Member
Re: ECMB short

Thanx. Tried to disconnect it and limp home on fuel pump prime (measured fuel pump current at 6 amps, pressure is good). I could just touch the oil pressure switch, but could not get it disconnected. Ended up getting it flat-bedded home. Any hints on getting at it? Remove upper intake?
 
turbodog

turbodog

Donating Member
Re: ECMB short

Got it out. That fixed the short. Just had to rotate my dist to get the ign. module connectors out of the way. There was oil in the electrical connector area, so I am hoping this may also fix my oil leak that I thought was rear main seal. Will find out when I install the replacement. Thanks for the responses.
 
cloneman315

cloneman315

Active member
Re: ECMB short

yeah that is the common problem most guys think when that fuse blows its a fuel pump problem but its not.
 
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