Finally Going Single! Part 2 by cohbra

5-14-2012

I did a little prep work tonight since my relays showed up today.

I labeled the relays and their connectors.

...and crimped the 10 gauge wire to the inline fuse holders.

secured together with some heat shrink.

I also removed the old wiring from the connector on the fuel pumps but I didn't think that justified a picture.

5-15-2012

I woke up wide awake at 2am last night and it suddenly occurred to me that I set my fuel pressure incorrectly. When I set my base pressure to 40psi, I didn't remove the vacuum line from the regulator. I hate stupid mistakes. Especially ones that I have to wake up at 2am to figure out.

5-16-2012

It's late, so I hope I didn't make too many errors in it. Now that I've got it done, I found that I definitely have an issue with my pump #2. It blows the fuse as soon as the key is turned on. I'm thinking that pump #2 is locked up and all of the flow from pump #1 is pushing right back into the tank through pump #2 which is why I am unable to build any pressure. I guess I should have installed a check valve on each pump outlet to prevent this from happening. Tomorrow I'll disconnect pump #2's outlet and cap it off to see if I can build sufficient pressure or not using only pump #1.

Also, here's the latest schematic which is also in the write up:

I pulled the pumps out of the tank this morning and found out that pump #1 is definitely bad. I checked and rechecked the wiring several times to be certain and then capped the lines and powered up the pumps one at at time to identify which one was bad. Pump #1 blew the fuse right away, so I moved pump #1's connector over to pump #2 to see if it would power the other pump without blowing the fuse and it powered right up. Next, I used pump #2's wiring on pump #1 to see if it would blow the fuse as expected, and it did. This isolates pump #1 as the problem. 

I also discovered that the reason I am unable to build any fuel pressure is because there isn't any fuel in the damn tank (an idiot move on my part once again). I thought I had fuel because the gauge was showing I had 3/4 of a tank, but I apparently got my pins crossed on the fuel sending unit when I inserted them into the bulkhead connector on the inside of the tank.

A new fuel pump on now on the way, so I should be back in business soon!

I filled up the tank with 5 fresh gallons of premix this afternoon and isolated pump #1 so that I could continue tuning until the new pump arrives. However, after firing it up, I'm back to my old issue of not getting any ignition on the front rotor. Tomorrow afternoon I'll remove the UIM to get full access to the coils and give them a complete checkout.