mazdabgood
+1y
Exactly, I would have wasted $85 if it wasn't you and your quick action to save my day!!
Beer is on me if you ever come through Oregon
EDIT:
Well unfortunately the problems not the relay
Turns out it must be the ECM:
-Both sides of the relay are operating correctly
I jumped the fuel relay test connector (yellow harness near wiper motor) and with that jumped and the key "ON" the relay closes that side and sends power to the pump. The test connector has to be jumped in order for the pump to get power with the key "ON".
I also tested the other side of the relay by unplugging my jumper wire from the test harness, then checking power at the starter wire while cranking engine. I have power their, so I checked if it was transfering it to the fuel pump power supply wire (black/red in relay harness) and it was.
So, the ECM is not wanting to send signal (ground in this case) to the fuel pump relay. I am able to ground it manually with the test connector, but the truck still doesn't start.
I've checked for spark on all four plugs/wires and have good spark.
I checked fuel pressure but didn't really do it correctly, I'll be doing it again in the morning (I capped the fuel line with the gauge after fuel filter and before the regulator so the regulator was not tested, pump tests great @80psi)
I'm pretty sure I need a new ECM
Anyone have any ideas what might be going wrong with the ecm that will make the truck not start even with fuel, spark, and air? ECM looks great internally by the way. I opened it up and it all visually is great, it has been rebuilt. (part# EM7039)
UPDATE: Turns out it was low compression (2 bad rings confirmed by leak down test), truck is being parted out.