I need to figure out my fuel system for my LS7, T56 Magnum F swapped, 1987 IROC Z Camaro;


Disregard the Holley 15' Unterminated Flying Lead Harness draped over the engine.


I'm swapping out the 3rd gen metal gas tank for a 4th gen, plastic tank that I purchased from Hawks Motorsports. I also have a brand new 4th gen, genuine GM fuel module for the tank.


I'm going to clean this tank up real well inside and out before I install it in my IROC.


I originally purchased this as a spare for my 2002 WS6 Trans Am that I've owned since brand new.

I know that the pump in this module isn't enough for the LS427/570 crate motor so my plan was to swap out the GM pump for something a little larger, 255lph or 340lph. I was thinking of using a USA made Walbro or maybe a DeatschWerks pump like I've got in the tank of my LS376/480 swapped, 1991 Foxbody Mustang coupe. I've read some writeups where people were complaining that they got pretty short lives out of some Racetronix fuel pumps so I'd prefer to stay away from them.

Upon further research, it appears that it isn't a simple matter of replacing the small OEM GM pump with a more powerful pump due to the venturi (whatever that is) that fills the bucket. I guess the aftermarket pumps don't have this and now you have to drill holes in the bottom of the fuel module bucket to allow fuel into the bucket. The downside to this is that at low fuel levels, i.e. below 1/4 tank, you might have fuel starvation especially going around corners/turns. I've experienced this with my Mustang as it has no bucket, just a crude pan/baffle at the bottom of the tank. I don't want to have to deal with keeping my tank more than 1/4 full all the time. I really want to keep the bucket intact to keep the pump immersed in fuel at all times.

Can anybody educate me a little more on this topic, please? Are there any bigger fuel pumps out there that would have the venturi device?

 

93-02 LS1/LT1 Walbro 255 LPH In-Tank Fuel Pump

You can see in the description of this Walbro pump under NOTE that it says, "Due to the fact that this kit does NOT utilize the factory venturi system, bucket modifications will be required for this kit to work properly."



Here is a complete fuel module assembly that they offer but it is a Racetronix pump:

99-02 LS1 F-Body Complete Fuel Pump Assembly W/RACETRONIX 340LPH Pump Installed (up to 800HP)

In the description, it says, "No more holes drilled, buckets mangled, or expensive billet hanger assemblies with no bucket to keep them fed! Do it once and do it RIGHT!"

 

Do you happen to have a trap door cut in the back of the car?? If not I would avoid Racetronix branded pumps like the fkn plague. Unless you like replacing pumps regularly. I gave them entirely too much money for their junk pumps and I've been stranded too many times too think about. I went with Walbro 350 pumps and haven't had anymore fuel pump issues since

 

This is what I worry about as well. No. I don't have a trap door and I wasn't planning on cutting one out.

I'm assuming that the Walbro 350 doesn't have the venturi to fill the bucket and you had to drill holes in your fuel bucket to allow fuel in, right?

 

I don't have a 4th gen tank in my car. There's multiple styles that will fit in those buckets tho. I run dual 350 pumps in my 91 tank

 

OK. Got it.

Anyone out there know of a bigger than stock 4th gen pump with a venturi for filling the bucket that is not a Racetronix brand?



I did find an Aeromotive fuel assembly that fits the 4th gen tank but it is completely different from the OEM fuel module.

Direct Drop-In In-Tank Fuel Pump Kit, 99-02 Camaro

 

There is plenty write ups on here with people putting even dual pumps in those buckets. It definitely can easily be done with 1 pump, I had 2 pumps in my 2000 silverado stock bucket before I decided to upgrade my fuel system. It just takes a little thought and planning.

 

I just found this fuel module with a 340lph pump that isn't a Racetronix pump and the bucket doesn't need any holes drilled in it:

Performance Fuel Pump Assembly w/ Sending Unit - Fits Airtex E3368M, QFS-A447HV QFS

Anybody got any thoughts on this fuel module assembly?

 

In post #6 I posted a link to the Aeromotive Phantom series pump. I called Aeromotive today and spoke with a tech named Andy. I got a good feeling about this pump assembly.

I've been researching these Aeromotive pumps online this evening and I mostly read good stuff about them and very little bad. People seem to be happy with them unlike Racetronix!

Something else that I found is the Holley Hydramat.

I remember over a decade ago when these came into the market. I saw a writeup in one of the car magazines back in the day. I've done a lot of research on these this evening and they are the real deal. Not cheap but they work very well at keeping your in-tank pump supplied with fuel. No bucket needed and, of course, no venturi fuel pump needed.