Won't start

[93gmcjimmy]

Ok I rigged up my pressure checker and pulled pressure off the line before the fuel filter and am still getting only 12 or so pounds of pressure. The fuel pump is brand new and still gets the same pressure as the old pump. I think that is to much of a coincidence. I have a bad feeling that the line is clogged. I am going to pull the tank tomorrow and check right off the pump. Any other ideas?

[old_master]

In my first response to your thread, I suggested that you check the grey and the black wires at the fuel pump connector. In post #10 you said the fuel pump connector has a grey and a purple wire and that the purple wire showed 1.29 ohms to ground. The purple wire is for the fuel level sender, not the fuel pump. There's a black wire in that same connector and it is the fuel pump ground. If there is high resistance in that wire to ground, the pump will not run at full speed which will cause fuel pressure to be low. If that's the case, any pump you install will give you the same results...low pressure output, until the ground wire is repaired.

[93gmcjimmy]

Ok I got it figured out. First I want to thank you old master for your help. I started my morning in the rain and working under an awning. I pulled pressure at the pump, still 12 pounds. I then decided that the pump was bad. The ohms checked out and the voltage was right. Stranger things have happened. I took the pump back and got a new one. Same problem. 12 psi. My dad was looking in the Chilton's manual and said that the pump was only supposed to have 12 psi. I looked at the manual and noticed he was under the TBI not the MPI section. The my dad asked if I got the right pump. I called O'Reilly's and asked them to double check the pump was for MPI and not TBI. Sure enough, they gave me the wrong pump. Of course it wasn't in stock but for the mixup they made a special trip to the warehouse and had it within 20 mins. Truck is running, yay now I can get to work on my own instead of bumming rides. Once again thank you all for your help.

[old_master]

Imagine that! You have to "assume" the parts people know what they're doing, and that's not always the case. Glad you got her going, and thanks for posting back.