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Old 07-10-2013, 10:39 AM   #1
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Default '89 GMC Sierra - fuel pump problems

Truck won't start; dribbled some gas in carb and it wanted to start; replaced fuel pump relay; replaced blown 10amp ECM B fuse.
Next thing to do is check the wiring to the tank. How hard is it to slip the bed? And does anyone have electric schematics for the fuel pump?

Thanks in advance
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Old 07-10-2013, 11:16 AM   #2
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I did a quick Google and come across this diagram...

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Old 07-10-2013, 12:08 PM   #3
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i had 89 full size and i did the pump by removing the bed. seemed way easier than fooling with rusted lines and tank straps. you only really have to prop one side up enough to access the top of the tank. having a impact really eases the bed bolt removal
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Old 07-10-2013, 03:06 PM   #4
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Thanks Mike & Justin,
I can't find the fuel pump test connector. My truck has a window washer tank where the pump test connector should be. Tomorrow morning while its still cool: heat index 104 right now.
I have a impact wrench; are the bolts hard to locate? I have been thinking about just cutting a hole in the bed, I can weld it back; the truck is a work horse for us (strange as it may seem, though, we both like to take it out for a ride every once in a while; manual shift, no air conditioning....sigh).
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Old 07-10-2013, 05:18 PM   #5
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not so easy cutting a hole because most things make sparks as does the welder and sparks and gas dont mix well. the bolts were fairly obvious, frame to bed
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