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Old 03-15-2012, 02:30 PM
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Fuel system for an LS motor: I don't know squat. Teach me please.

Hello all,

I have a 1937 Chevrolet 4 door that I'm building as a family car for my wife. We're using a 5.3 LS motor from a 2003 Chevy truck.

I need to get a fuel system. I have the frame out from under the car now and it is being sand blasted. I hope to build the complete drivetrain first and set the body down after I'm through. I'd like to get the fuel system in first because it would be much easier that way. That being said, I know absolutely nothing about the fuel system for a fuel injected engine.

I'd like to use a metal gas tank.

What company should I get a tank from? Is it better to have an inline fuel pump or have on in the tank? What parts will I need to order to make the fuel system work? Will I have to use a pressurized gas cap? Feel free to talk very simple because I know nothing about this. Even just a list of what I would need to make the fuel system work would be helpful.

Thanks,
Brandon
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Old 03-16-2012, 07:28 AM
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After market tanks, metal or poly will do the job. I personally recommend an inline pump on the older cars because of the difficulty you can encounter in replacing in tank pumps. The plumbing is relatively simple but there are some things you need to be aware of. First, you need an anti sloshing system inside the tank. Baffles would suffice if you are not going to be involved in hard cornering such as doing a lot of mountain driving. Next,you need to ensure your pickup tube is very close to the bottom because anytime it sucks air, the engine will falter because the injectors are very pressure sensitive. The fuel return line that EFI systems require should also go to the bottom of the tank. If it dumps high in the tank, the fuel is subject to get a lot of air bubbles, thus a faltering engine results. EFI requires much higher fuel pressure than a carb and it must be constant in the designed range, thus a pressure regulator is required. The pump pressure has to be above the regulated range and be capable of delivering a constant volume above the highest demand the motor would require. Thus when buying a pump, look at both the pressure and volume of the pump. CAUTION: don't skimp on the pump!!!! An in line filter is a must. Most installations call for the filter to be between the tank and the pump to prevent excessive wear. Hard fuel lines are great, but good quality soft lines are OK, but like the pump, go for quality here as well.

Trees
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Old 03-16-2012, 01:25 PM
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OK, thanks, that's the kind of stuff I've been looking for. Are there any recommended companies that are better than others for purchasing a tank?

Thanks,
Brandon
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Old 03-16-2012, 02:49 PM
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Tanks

You may consider these folks, product line is pretty impressive.

Tank;http://www.tanksinc.com/index.cfm/pa...rod/prd124.htm

Fuel pump;http://www.tanksinc.com/index.cfm/pa...prod/prd84.htm

Sending unit;http://www.tanksinc.com/index.cfm/pa...rod/prd276.htm

Hope this helps you. Nolan
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