hi i am shannon i will help on this issue
the pump gets power for three secounts when the key is first turned on
after that it gets it power from the oil pressure switch
but let me check that .i will get you a diagram.
i will switch us to Q&A mode.
and a fues loactaion
i will post back with a diagram and a fuse location .
My husband is going to try testing at the relay and we'll get back to you asap. Thanks
we're having trouble finding the relay.......can you tell me where it's at and with a description of what it looks like? Thanks!
i don,t have a diagram for it but it should be in your hand book that came with the truck. hear is what i got.
okay, we are double checking. I think that the relay is okay, but I will confirm that in a few minutes
first you need to be sure the relay is getting all the power and ground it need check the relay may have a diagram printed on it . the pins should be numbered 30, 87 ,86 ,85,
pin 30 should have power with key on
pin 87 is the output to the fuel pump .if you jump these two the pump should run.
86 ,85, one has power for three seconds. the other is the ground.
The last info that you sent helped......we've located the right spot to test and are doing it now. Just so you know, my husband has done quite a bit of work on vehicles. He rebuilt the entire engine on his Ford F150 truck last year and has done lots of work on this blazer. But for some reason the replacement of the fuel pump (for the third time) has really turned into a big problem this time!
I'll have an answer for you soon.
its the gray that power the fuel pump not the purple.the purple is for the fuel level sensor,
so dose the gray wire get power when you jump the relay?down to the fuel pump? your post(The purple wire back at the fuel pump never received power during all of the tests. ( The purple wire back at the fuel pump never received power during all of the tests. What should we do next. )
trying this and checking info based on your last response......will reply again shortly
Are you available to answer a few more questions on this blazer? It won't start again today. Thanks