Help me Plan out My EZ EFI Sytem - Regular or Multiport - Also Help with Fuel System

[Old66Tiger]

Hi Greg,

I run about 11-12" of vacuum with this cam. It does not bounce much more than 1" at any time. Although, this is idling at 750 RPM and I would like to idle higher, but my carb likes to drip off the booster with more RPM than that. I think if i idled higher, the vacuum would be almost 12" Is 11" with 1" of bounce enough vacuum?

I am planning a MSD 6AL2 unit with the rev limiter. That is a nice box and should work well.

I am really stuck on the two different systems. I wish there was a clear cut advantage, but i am not finding one.

I have a thought on the tank. I will sketch something up tomorrow and post it. I hate the looks of the rear sumps. They just look odd on a pro-touring car. My idea involves cutting a 12"X12" hole in the top front portion of the tank, making a box that fits in this area with 3 trap doors. One in the back, and one on each side. The idea is that under hard acceleration, gas will force the rear door shut and trap the fuel in the sump. On a hard decel, the fule will open the trap door and fill the sump. Same goes for the side trap doors. A hard right will close the left side trap door and open the right side trap door and vise versa. The top of the box would be welded or soldered to the top of the tank and the pump and the lines would be screwed into the top of the sump box.

Since this is a used tank, i figured that it would be a good place to practice. I just need to get it cleaned out enough to cut and weld on it. Is there any solution that can help with this? i like the dry ice idea. Where can a fella get some of that?

I was going to have the pump draw out of one compartment of the box and have the return dump into another compartment. This will allow me to recess the box down about 1" below the top of the tank so i can get the lines in and out of the top of the sump box. I have -8An aeroquip line running from the rear to the front and i also have the factory 5/16" line that i could use for return. Will that work for this application?.

Thanks for the help. Bob

[GregWeld]

I put my responses in the quote in red... hope it helps.

Originally Posted by Old66Tiger

Hi Greg,

I run about 11-12" of vacuum with this cam. It does not bounce much more than 1" at any time. Although, this is idling at 750 RPM and I would like to idle higher, but my carb likes to drip off the booster with more RPM than that. I think if i idled higher, the vacuum would be almost 12" Is 11" with 1" of bounce enough vacuum? That's plenty of vacuum and is pretty darn steady!

I am planning a MSD 6AL2 unit with the rev limiter. That is a nice box and should work well. Perfect.

I am really stuck on the two different systems. I wish there was a clear cut advantage, but i am not finding one. Can't help ya there...

I have a thought on the tank. I will sketch something up tomorrow and post it. I hate the looks of the rear sumps. They just look odd on a pro-touring car. My idea involves cutting a 12"X12" hole in the top front portion of the tank, making a box that fits in this area with 3 trap doors. One in the back, and one on each side. The idea is that under hard acceleration, gas will force the rear door shut and trap the fuel in the sump. On a hard decel, the fule will open the trap door and fill the sump. Same goes for the side trap doors. A hard right will close the left side trap door and open the right side trap door and vise versa. The top of the box would be welded or soldered to the top of the tank and the pump and the lines would be screwed into the top of the sump box. Complicated.. I don't like moving parts...

Since this is a used tank, i figured that it would be a good place to practice. I just need to get it cleaned out enough to cut and weld on it. Is there any solution that can help with this? i like the dry ice idea. Where can a fella get some of that? Soapy water - I used SIMPLE GREEN - twice - rinsed really well - let it air dry for a couple days... DRY ICE is available anywhere they sell fish - try your local grocery store.

I was going to have the pump draw out of one compartment of the box and have the return dump into another compartment. This will allow me to recess the box down about 1" below the top of the tank so i can get the lines in and out of the top of the sump box. I have -8An aeroquip line running from the rear to the front and i also have the factory 5/16" line that i could use for return. Will that work for this application?. Sounds pretty good but a 3/8 return might be better. There are "rules" on line size - I just don't know them.

Thanks for the help. Bob

[Old66Tiger]

I was thinking about modifying my tank but now i am thinking of just getting a pre-made tank. I have narrowed in on either Rock Valley or Ricks. This is no canyon carver but a serious street car. I want a tank that is beautiful and performs like it should. I don't want issues with the pump running out of fuel due to sloshing, etc.

From the pictures that i see on Rick's site, the tanks are a brushed finish and look great. I have seen some pictures on the board for the RV tanks and they are not as polished. OR am I wrong? so hard to tell from pictures on the boards.

[David Pozzi]

Take a look at the Ricks Vaporworx tank, it uses a late model fuel bucket with pump inside and is proven to work.

[Old66Tiger]

I looked at those tanks but you are confined to only that pump with no options for upgrading in the future. on top of that, it is almost $1500 for the tank and pump.

[snaponbilly]

FINALLY a thread on the EZ EFI install!!! i need some ideas/ help as well. i'm running a Jim Butler 492 in a '79 tenth anniversary Trans Am. dynoed at about 590HP if i remember correctly. bought the kit from them as well, but am having trouble trying to figure out what to do with the fuel line(s) connections and the stock tank and sending unit.
i'm restoring this car and soon i'll be ready to set up the EFI, so i'm doing my homework since i've never done mods before this heavy. the car has a complete suspension from GW, Baer brakes, etc. i'm going for a factory "modified" look rather than a total differant look. all my mods so far are underneath the surface, so i too am not a fan of the fuel tank sump appearance. look forward to the ideas!

[GregWeld]

You can run an internal EFI pump and pre-filter. I don't know who makes a stock replacement tank for your car - but if you know who does - then ask if they do an internal pump version.

You'll have to discuss with Butler and or FAST what fueling your motor will need and size the pump accordingly. Ditto the injectors. I assume you're planning on using the EZ EFI throttle body? I think it will support 600hp... Check with them to make sure. You don't want to run that bad boy lean!

Fuel line size is also dependent on the hp and fueling needs. Running -8 for a feed line and a -6 should be fine.