1st gen high HP guys, which would you prefer? Cutting the tank and installing a sump, or just dropping it an putting in a fuel cell? Also, what about fuel line? Do you run AN front to rear or would you use hard line such as aluminum tubing?

 

I dropped the old tank and put in a cell. This was much easier than putting a sump on the original tank for me. I then ran AN line to the front.

 

Were you able to get the stock fuel gauge to work? I have a cell in my car but I think I might go back to a stock tank with a sump. I cant get the stock gauge to work in my car. I might actually enjoy putting gas in the car in the stock location rather than popping the trunk!

Here I started a thred with a bit of detail:

http://web.camaross.com/forums/showt...threadid=93416

Thanks,
Sean

 

Sump your stock tank. That's how mine is done, and the fuel gauge sender works fine. I have two -10 outlets from the sump; (only 1 of which I use) which has a Holley Blue pump at the tank and -10 braided steel hose to the fuel pressure regulator. The other outlet in the sump was for another complete fuel system for the nitrous which the previous owner had used.

Dave

 

Another vote for sumping the stock tank. We didn't run a cell because of the hassle of building a rear firewall (as required by NHRA and our State motor vehicle code.)

The fuel system is plumbed entirely with AN braided stainless: -10 from the sump to the filter/pump, -8 to the carb and regulator, -10 return to the tank. Again, all done in accordance with NHRA rules and regs.

 

You can have a cell in the trunk as long as you do not cut the metal backing behind the seat and the rear seat is still there, then that will be acceptable as a rear firewall by NHRA.

 

Say - isn't that a rather huge return line size? You can see my -10 system and fuel system here. Mine deadheads against the adjustable regulator with no return line to the tank. I believe the Holley Blue has an internal bypass to regulate fuel volume, so maybe thats why I don't need a return line.

Dave

 

No offense intended, but can you cite the chapter and paragraph from the NHRA rulebook for me? I'd like to know if I missed it or misinterpreted the regulations, or if it's a 2003 revision.

My '02 rulebook Section 16, Paragraph 1:5 states "...All fuel tanks must be isolated from the driver's compartment by a firewall, completely sealed to prevent any fuel from entering the driver's compartment."

Section 1A Paragraph 1 states "...require complete bulkhead of at least .024-inch steel or .032-inch aluminum to isolate driver compartment from trunk."

I see no exemption for having unaltered bracing and rear seat.

 

Don't have rule book, but I ran my 79 at Firebird raceway in Idaho and passed tech every time (even when the NHRA officials were there for the divisionmeet) and did nothing as far as adding a firewall. I also have a friend who ran his 67 at the Pro stock super bowl in Houston last month and he passed tech with his fuel cell in the trunk (he was even running low 9s) and he has not touched his trunk either. Maybe it is a "judgement call" from the officials, but I have never had any problems (maybe I'm just lucky)

 

I went with a cell in mine, did'nt run a return line either cause the aeromotive pump did'nt require it. I uses AN line to a 1/2 aluminum line and then back to AN under the hood. I used to drive this car everyday and never had a problem with the pump getting to hot. As far as the NHRA rules are concerned I think RS71Z28 is right about the fire wall thing. my cell is actually under the trunk and it has an access door to get to it, but i think the stock trunk floor might be too low for a decent size cell. Either way you go you'll be alright, but it is kinda cool seeing the expressions on peoples faces when you fill up through the trunk

 

much fuel system info:
http://www.1bad69.com/fuel_system/index.htm

dead head style regulators are ok, but harder on the pump and not as consistant as the return style ones. They will also run the pump hotter, presurize the fuel more in the lines and leave fuel in the lines longer which leads to hotter fuel (although, probably not much).

as far as I know, there is no down side (apart from cost and having a large enough return line) to having a return style sytem.