1992 GMC Jimmy no power to full pump

1992 GMC JIMMY

120,000 MILES • 4.3L • 6 CYL • 2WD • AUTOMATIC

CHRIS843

MEMBER
2 POSTS
FOLLOW

I have no power to full pump. I've put a new full pump in, i've checked the full pump relay an they are good, an i've checked all the ground wires an they are good. There is power to the ecm fuse but im still not getting any power to the full pump.. I've even checked the oil pressure sending unit and its good an still no power.... any suggestions?????? (would the computer be causing the problem?)

Mar 24, 2015 at 3:20 PM

HMAC300

CERTIFIED EXPERT
48,601 POSTS

check items in pic the orange is power to relay see if that gets it ecm B is fuse to check. gray goes to tank blkwht to ground and grn/wht goes to pcm it can be a bd connection so check that stuff first. pics show wiring and where fp relay is.

Images (Click to enlarge)

Mar 24, 2015 at 4:30 PM

CHRIS843

MEMBER
2 POSTS

I checked connectors they are good so I jumped the orange to the grey an it got power to the pump an its working so dose that mean the relay is bad and needs replacing???

Mar 25, 2015 at 9:12 AM

HMAC300

CERTIFIED EXPERT
48,601 POSTS

either the relay is bad or it'snot getting a signal from pcm

Mar 25, 2015 at 9:23 AM