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96 suburban 5.7 died

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Cobra_fd

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Helping a buddy out here...or at least trying.

 

He has a 96 suburban k body 5.7, and on a recent trip it just died. He drove it about 250km (155miles) and parked it for three days. When he went to come home he got about 50km down the road and it died, not slowly, just running then not. On the side of the road, in the dark, he determined the fuel pump was not pumping, but the fuse was good so his conclusion was failed pump. Had it towed home and we were going to change the pump, but before we started, we decided to take a code reading as the check engine light is lite. Could not establish a connection between the reader and the vehicle, and upon further inspection of fuses, found the ecm-l 20amp blown. Aha you say.....changed the fuse and instantly blows when the key is turned to on. Did a check of all the pin terminal connections and wiring harnesses, and even looked under the fuse block as someone mentioned on here under a different thread, to look for mouse invasion, but all looks "good".

 

Does anyone have an idea, or has expierienced the fuse for the ecm blowing so quickly? On a whim, we got another known good ecm and plugged it in with the same results. We even tried a new fuse without the ecm connected and it blew the fuse the same.

 

Are we missing something or is it auto wrecker fodder?

 

Thanks for reading, any suggestions could win the lucky submitter a beer. :drool:

 

Steve

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