Fuel Delivery: TPI to Carb Conversion

[88WS-6]

Originally Posted by WildBillyT

In the last pic those are power steering lines.


That is without question the worst Holley Blue installation I've ever seen. Starting from the tank and working forward:

1.) That's the wrong kind of fuel filter between the sending unit and the pump. A coarser filter goes back there (like a Fram HPG1) and fine filter goes up by the carb.

2.) I have never seen somebody mount a Holley pump like this in any way but straight up and down. Horizontal is just asking for trouble and it may have air issues. I'd bet that the motor itself is full of fuel.

3.) Can't tell from the pics, but it's probably not on a relay and the wiring is probably too small.

You're welcome. And trust me, I know how to find them.

[WildBillyT]

Originally Posted by 88WS-6

You're welcome. And trust me, I know how to find them.

Trust me, I have found ringers myself. Like an 18" rocker panel hole that was fiberglassed over.

On a good note that's all pretty easy to fix.

[88WS-6]

Well I could remove the electric pump and incorrect filters and just use the mech pump on the block. I'll have to see if I can get a part # off it to see what it is and if it has a regulator internally. I also need to see exactly what is running to and from it and if it has a return line.

[WildBillyT]

Originally Posted by 88WS-6

Well I could remove the electric pump and incorrect filters and just use the mech pump on the block. I'll have to see if I can get a part # off it to see what it is and if it has a regulator internally. I also need to see exactly what is running to and from it and if it has a return line.

That would be your best bet IMO.

[BonzoHansen]

gonna need a filter between the mech pump and the carb

[WildBillyT]

Originally Posted by 88WS-6

Listen, I'm a driver not a thinker. They very well could be steering lines, although they run in front of the rad over to the mech fuel pump.

One of those could very well be a return line back to the tank. It looks like there's a h@x0r return line near your Holley Blue.

[88WS-6]

Originally Posted by BonzoHansen

gonna need a filter between the mech pump and the carb

Roger that.

[V]

one other quick side question.... when the stock in-tank pump was removed, was the pickup tube extended to actually reach further down into the tank or just left without the pump attached? if it was just left, you may have starvation issues due to that also.

[BonzoHansen]

I still think he has ignition issues....

Maybe we can find some time in a few weeks to come look.

[88WS-6]

This is behind the driver's seat. It looks like he accessed it through a drain-cap thankfully and did not cut a hole in the floor:



The electrical tape is around the cap in the picture.



This looks like where the wiring harness was cut:




Another shot of the mech fuel pump. Hard to see because of the shady, green wire to the battery in the foreground, but there is one line in and one line out of the pump:




This shot shows the line running from the mech pump, under the water pump and block to the red/blue fitting in the picture. Fuel feed line I'm assuming:




This part got tough. Dead center in this pic, just under the firewall, the shiny part behind the power steering arm(?):



Another shot of the same part. I was practically mounting the radiator at this point:



One last shot of it. I'm assuming it's a regulator? The line to the pump, with the red/blue, fitting attaches here. Then heads under the car:





So from what I can see there is a line from the tank to the Holley blue pump in front of the rear axle. Then a line under the car to just under the firewall where that regulator(?) is in the last few pics. Then from there it goes to the red/blue fitting just in front of the engine block and then from there to the fuel pump. Then there is a separate line from the mech fuel pump on the block up and in between the block and engine accessories to the carb (pic below of the end).

[The Fixer]

Pictures like that cut wiring harness make me cry. If you're going to stay carb, you might as well remove all the stuff going to the computer and clean up the previous owners mess. I'm pretty sure that tan wire by the hole in the floor was the power to the OEM fuel pump. You'll need to trace that mess as well.


Wow, I hate butchers.

[88WS-6]

Yea I really need to get under this thing but no jack + gravel driveway = not gonna happen.

[WildBillyT]

That silver thing looks like a fuel filter. It is not a regulator, or at least the one that comes with a Holley Blue.

If that fuel filter is that close to an exhaust manifold I wonder if you are heating your fuel.

[BonzoHansen]

what a mess. yes, that looks like a filter.

[88WS-6]

Originally Posted by BonzoHansen

what a mess. yes, that looks like a filter.

Which I can re-use, only in a location just before the carb right? I don't know why he would put it there. I can barely see it, let alone get to it. He did mention that he was running out of fuel line, so I'm guessing this was one of the results of that...

[WildBillyT]

Originally Posted by 88WS-6

Which I can re-use, only in a location just before the carb right? I don't know why he would put it there. I can barely see it, let alone get to it. He did mention that he was running out of fuel line, so I'm guessing this was one of the results of that...

They are cheap, just replace it.





admin note: registration discussion moved to here: http://www.njfboa.org/forums/showthread.php?t=59047 BH-

[88WS-6]

What would be a good quality mechanical pump that I can install with a return line to the tank? I found a stock replacement Bosch pump from Rock Auto. It's the pump from the 87 LG4 cars I think, Bosch #68501. Is the vapor return line the same as a tank return line or is that for the charcoal canister?

I found a replacement in-tank pump, but I think it makes more sense to use a mechanical one on the block for now.

http://www.autozone.com/autozone/par...1_173883_4967_

[BonzoHansen]

what is wrong with the one you have now?

[LTb1ow]

Originally Posted by BonzoHansen

what is wrong with the one you have now?

Seeing the rest of the hack job, I would deem its performance questionable at best.

But thats me.

[88WS-6]

It only has an input and output line with no return line to the tank or vapor line (is there a difference?). I'd like to find one that has this.

[BonzoHansen]

Why? Most don't. however a nice stock replacement pump should be fine for this. I think if you look up most any 2nd gen with ac you'll find a pump with a return feed. My 77z has one.

Is there a return line back to the tank now to attach it to?

If this was my car i'd start with known issues before buying parts on a whim. But that's just me, I'm cheap. I think you are going to spend a few bucks just un rigging stuff.

[sweetbmxrider]

Ls1 corvette fuel filters have the return built into it but its operating pressure is much higher than yours.

[BonzoHansen]

Carb setups are simple. Do not complicate it.

[sweetbmxrider]

Well you're no fun

[WildBillyT]

Originally Posted by BonzoHansen

Is there a return line back to the tank now to attach it to?

Find this out first.