Here's my problem...i need help quick. I'm in the middle of swapping out my 89 tbi setup for an 88 TPI setup. When we layed the 2 wiring harnesses side by side, we noticed that the TPI harness has a fuel pump relay and fuel pump boss primer plug (that's what it's called in the haynes manual), and the TBI setup didnt. This means that the plug on the TPI harness has nowhere to plug into. So how is the fuel pump going to come on? I'm thinking that maybe the plug is something that can be bypassed, or i'm going to have to splice the wires off that plug into the wires leading to the fuel pump. What I dont get though is...how did the TBI pump turn on if it didn't have a fuel pump relay?? It had to have some other method. If anyone knows anything, help me out...thanks

 

I don't have an answer to your question--but you have to swap out the tbi pump for a tpi fuel pump. The tbi pump doesn't push enough pressure--so it won't run(once the tpi is all in).

 

Yea, I know...the pump goes in tomorrow. I'm dreading it though, because I hear you have to drop the exaust, take off the springs, etc. But thanks for the heads up anyways.

 

I've read that the fuel pump is actually activated by the Oil pressure switch....if that's so, then Its not absolutely necessary to have the fuel pump relay hooked up....it'll just take longer to crank right?