Discussion in 'Early CJ5 and CJ6 Tech' started by msbweiland, Nov 30, 2003.
I will snap some this afternoon.
Okay, here's where I am at. Hopefully one of you guys can give me some direction so I can take some pics. I have the kit completely installed and everything is working except one thing. I can't seem to get the electric fuel pump primed. It is installed in the passenger frame rail below the level of the fuel tank. The fuel line doesn't make any uphill bends but I can't get fuel into the pump. Anyone have any ideas on how to get this primed? I think if I can get it primed, I am home free.
I haven't read the entire thread, so bear with me.
1) Make sure the fuel pump isn't wired backwards. I have a "friend" that did this. It spins backwards and sounds like its running.
2) OEM computers just run the pump a couple seconds when you first hit the switch. It sometimes helps to crack the input line and cycle the switch many times. Input to the TBI that is...
Its a Buick.... pack the fuel pump with vaseline...
NOOOOO jus' Kidding!
Electric fuel pumps also work better closer to the tank. Poor suckers but good pushers.
Okay, here is where I am at. I pulled the line going into the filter just before the pump and there was gas in it. So then I pulled the line after the pump and it was dry. I pulled the line feeding the pump and there was gas in the pump. When I hit the ignition to cycle the pump, gas came out the wrong end. What does this mean? I double checked all the wiring, and the pump is wired according to the instructions. Is the pump bad or do you think I need to reverse the + and - wires on the pump? I tried installing the pump opposite the flow arrow since that was the direction gas was coming out and that didn't do the trick. Thanks for the help. We are "this" close....
Doubt its bad. It does sound like a polarity thing but it's hard to go against the instructions. w-w-w-wait.... what are you doing reading the instructions? Are we not men? IIWM, I'd try reversing. Up to you
I'd yank that pump out of the vehicle and do some testing independent of the Holley wiring harness. Rig up a gas can and a battery to feed the pump 12V and see if it's flowing fuel. If you have one, you can also use an inline fuel pressure gauge on the output. That'll let you know whether or not the problem is in the pump or the Holley harness/software.
If the pump works fine outside of the vehicle, give the Holley tech line a call. They're really good about helping their customers out, even with older systems. It's been a long, long time since I've messed with a Projection system. Can't remember if it's got a low oil pressure cutoff or someting similar that could be tripping the fuel pump off.
Is the gas tank venting?
Pull the gas cap off and try again...
"When I hit the ignition to cycle the pump, gas came out the wrong end. What does this mean?"
It means your wires are reversed.
"Is the pump bad or do you think I need to reverse the + and - wires on the pump?"
I think you need to reverse the wires.
"I tried installing the pump opposite the flow arrow"
I think this is a bad idea. In general most pump will flow either way but will flow much better the correct way.
This post made me laugh. I think you are right and I will be reversing the wires first thing after work today. Thanks again and I'll let you all know this afternoon.
Yes, it made me laugh also. I "discovered" the reversed wires problem while on a trail ride. A guy overheated his auto tranny which caused a fire which burned some of his wiring. We repaired the wiring somewhat but he couldn't get the engine to start & I happened to be standing next to the gas tank filler so I heard the sound of "bubbling" from his gas tank. When I mentioned this to the others they all looked at each other and said "we wired the fuel pump backwards". Anyway, that's how I learned about this.
OKAY! Big thanks to all of you who chimed in on the fuel pump issue. It was wired backwards per Holley's printed instructions. After I reversed the wires and put it all back together, it fired on the first turn of the key. I began the tuning procedure but found out my electrical tester has a bad fuse. So, I am off the RadioShack to get a new one and a spare. Pictures of the install are coming.
Ok, what happened to this project? I would really like to know how it turned out. What you used, and how to duplicate it if your conversion is working well. Man, don't leave us in the dark, we have been waiting for the out come. It is an interesting project!!!
Sorry. I am still in the tuning stages. I can't seem to get my TPS (throttle position sensor) adjusted properly. I get a different answer from Holley every time I call. It's getting frustrating. The good news is that it runs. It just runs really rich and floods out after starting it. It's all related to that TPS. I will have pics and more details after I get it dialed in. FYI: Holley just came out with a Commander 950, 400 cfm 2-barrel kit that looks even more promising. It has a MAP sensor and something else the Pro-Jection doesn't have. It should be completely self adjusting for altitude and everything.
Quick update: After trying 4 different TPS and 2 different TB. Holley tech support and I (mostly me) have come to the conclusion that my ECU must be bad. I am working with Holley right now to get the ECU replaced under warranty and then I will let you all know where we stand.
Thanks for the update Mike...
many of us are lurking with interest...
Keep us posted!
Okay, so did I miss the part where you said that you are using a Holley TBI. I just want to know what parts you used if it works out all right. Yes, we are excited to hear the out come on this project.
Yes, it's just their out of the box 2 barrel digital pro jection kit. I think it will work great once I can get the TPS setup.
Re: 225 W/Pro-jection (Update)
Hopefully someone has some insight for me as I am about out of ideas. I have been trouble getting the TPS adjusted. It's supposed to show .63-.65 volts at idle. After I adjust mine all the way down it still reads 1.02 volts. If I remove the TPS from the TB, the lowest reading I can get is a .91. I have tried 4 different TPS, 2 different TB, and 2 different computers. All with the same results. Could I have a bad meter? I am POSITIVE my grounds are all good. Thanks
So is this a direct swap onto a 2bl odd fire 231?
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