Need FASS wiring help Fast

[ctdiesel99]

My truck is a 99 and i have the 95gph HPFP (high pressure fuel pump), just pump no filters. My truck died the other night and my FASS isn't turning on at all. I ran wire straight from the battery to the fass and it runs when the key turned on. I checked with a test light and i'm getting power out of the ecm, my fuse is good, and i swapped out another relay on to it and it still wont work. I'm guessing i have a burned up wire somewhere in the system for some weird reason. My question is, can i just run my own wire from the fass connection all the way to the battery. Green wire to the negative side, red wire in the cab connected to the power window fuse with a 30A fuse in the red wire and just leave it disconnected from the ecm and not use a relay? I have to get this thing running today!!!! Just don't want to cause any other problems in doing so. Thanks in advance

 

[Billysgoat]

Redo the wires first using the relay getting signal from the ECM, you could do as you describe, but why?? It would be quicker to rewire what you have. That is all assuming that you are getting the signal to the relay, check that first.

 

[ctdiesel99]

stupid question i know (and please forgive me, it's an understatement when i say i HATE wiring) but how would i check to see if i'm gettin signal to the relay? All i have is a test light. I'm assuming i could unplug the relay and stick my test light down into each one of the slots on the relay to see if it's getting power?

 

[ctdiesel99]

okay i just went out and unplugged the top of the relay, and hooked up my test light and checked all 4 wires hooked in to the relay (3 red, 1 green). My test light showed power coming from the red wire hooked up to the battery (it lit up bright). The next one i tried was the red wire that's connected to the ecm, it also light up but not as bright as the one from the battery. The third red wire i tested, which goes straight to the pump did not light up at all. Not sure if where the green wire goes in to the relay should light up too, but it did not when i tested it.

 

[Billysgoat]

Ok, look at the pic below, the wire coming from the ECM should go to post #85 on the relay, if the numbers are different on yours, just go with the symbols, they will be the same. You want the hot from the ECM to one side of the coil with the other side going to ground. The coil is symbolized by the squiggly lines usually. The lines that look like half a teeter-totter? That is the actual switch in the relay. You want the hot wire coming from the battery to go into #30 and come out #87. Like I said, if your relay has different numbers just go by symbol, it will be the same.

From reading your posts, it sounds like you have power to the relay, and are getting a signal to it, check the green wire, that should be your ground, bet it's loose. Remove it, clean the connection and retry.

 

[ctdiesel99]

okay, i used a jumper wire in the relay from the 30a wire to the port where the red wire to the ecm was mounted and the fass started running. so i cut the red wire going to the ecm and routed it inside the cab to the power window fuse and voila, it works now when i turn my key on. Thanks for all the help, unfortunately my starter took a dump on me in the middle of all this, but thanks again