Wannabebrat

Ok so now that you mention it there is something going on with the switch. When you turn it over hard it won't engage the starter. Kind of like there is a bad or faulty spot. When you hold it just right and turn gently it will turn over fine. But I defiantly wasn't getting a full 12v at fpcu harness with key on. So I assume now I make sure there are 12v coming into the switch and if so replace it?

Ok so update....I hooked the fuel pump up to directly to the battery with a 15amp fuse in the hot line and BINGO!! pump ran fine...car started and ran fine for awhile. SO thanks again for the help so far. I checked and I have 8-9 volts coming into 2 or 3 different leads on the wiring harness that connects to the fpcu. So now that the pump and all work I'm assuming it has to be the fpcu since there is voltage coming into the harness with the switch on ..would that be correct? I don't mind paying 70 bucks for the relay listed above so everything works correctly....but is there anything else I need to check first just to make sure its the relay? If I do get that relay (and figure out how to hook it up) what would I be losing if I use a cheaper 6 pin relay like this one? https://www.amazon.com/Standard-Motor-Products-RY56-Relay/dp/B000C7ZVH8 Would something like this even work? I hear "just add a relay and bypass" it a lot but I don't really know where to add it and what it needs to hooked to and how.I have no problems following directions when it comes to electrical but figuring it out on my on is not my strong suit so forgive my ignorance. Any direction would be much appreciated.

Ok so update....I hooked the fuel pump up to directly to the battery with a 15amp fuse in the hot line and BINGO!! pump ran fine...car started and ran fine for awhile. SO thanks again for the help so far. I checked and I have 8-9 volts coming into 2 or 3 different leads on the wiring harness that connects to the fpcu. So now that the pump and all work I'm assuming it has to be the fpcu since there is voltage coming into the harness with the switch on ..would that be correct? I don't mind paying 70 bucks for the relay listed above so everything works correctly....but is there anything else I need to check first just to make sure its the relay? If I do get that relay (and figure out how to hook it up) what would I be losing if I use a cheaper 6 pin relay like this one? https://www.amazon.com/Standard-Motor-Products-RY56-Relay/dp/B000C7ZVH8 Would something like this even work? I hear "just add a relay and bypass" it a lot but I don't really know where to add it and what it needs to hooked to and how.I have no problems following directions when it comes to electrical but figuring it out on my on is not my strong suit so forgive my ignorance. Any direction would be much appreciated. Thanks!

Hey where did you find the fpcu replacement? I think I need one as well. Thanks!

i think I am chasing the same gremlin....what happened with yours? Also I found that noise reduction thing in mine....looks like one end goes to the coil and the other is hanging....any idea where the other end goes?

Okay I'll check the voltage here shortly. I know those relays are hard to find for replacement is there any aftermarket ones that would work?

Also just FYI when I was testing the fuel pump connector I used a test light connected to the ground bolt on the bracket and it grounded good enough to light up test light when I touch the terminal while cranking. Is there supposed to be exactly 12 volts to the hot terminal? I just used a test light not a voltmeter. I was assuming in that connector one is the hot and one is the ground? I only had voltage on one lead.

so this is what I was thinking probably some small stupid electrical thing I can't figure out. I haven't been able to discern does this thing ground on the bracket the fuel pump is mounted on? On my bracket there is a small ground wire attached to the bracket screw. This looks like it may have been added after the fact but I'm not sure. I read somewhere you can ground from the frame like this and attach the other end of the wire to the fuel pump body. I did try to ground on the bracket and with the wire attached to the bracket and it didn't seem to make a difference. I will try to run a wire directly from the battery negative terminal and see if that works. Do you know how these fuel pump are supposed to be correctly grounded?

I thought that may be a problem as well so before I did anything I drained all of the old fuel out of the tank and put in some new ethanol free gas. I also replaced all the rubber hoses that hook up right at the fuel pump just to be safe. The pump is brand new so I have not bench tested it but I assume I just hook up a hot lead and ground from a battery and the pump should run correct?

If I pour gas directly in the carb it will start and run fine so I'm assuming it's not a spark problem. As long as I keep feeding your gas it keeps running.

Hey I thought this might be the problem as well so I already did disconnect the line from the tank that runs to the pump and blow air through it and air came out with no problem at all going to the pump so I know it's not obstructed from tank to pump. I read up on that relay and assumed if I was getting voltage at the fuel pump connector that wouldn't be a problem is that incorrect?

Hey guys nice to meet you all. First of all thanks for all the info you have shared....it has helped a lot already. So I just got a great deal on 2 brats, a 85 and 86. Both are decent shape but have sat for awhile and each have their issues. I wanna get them both going instead of a Frankenstein scenario if possible.. So right now I'm dealing with a fuel issues on the 85. I have read several threads out the fpcu and whatnot but I'm kind of stuck..... Car whens fine when fuel is poured in carb, test light shows power while cranking at fuel pump wiring harness, no sign of power or suction at either end of the fuel pump when trying to start. Fuel pump is brand new. So it seems like it is getting power to the pump but no function from the pump. So like I said I'm kinda stuck....grounding issue? Please help. If any pictures or more description would help please let me know. P.S. I have been looking into these things for a while so I'm super excited to get them going and have some fun with them. I'm sure I will have a ton more questions, so thanks in advance for you advice and patiance, I'm sure I will owe some of you guys more than a few beers by the time its said and done.