Sumped stock tank vs Fuel Cell - Team Camaro Tech
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post #1 of 4 (permalink) Old Sep 23rd, 03, 07:25 PM Thread Starter
6D9
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Ron
 
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What do you guys think is a better way to go?? Overall cost ??

69 Camaro
491/AFR 315'S/Straub hyd roller
TH400/GV OD
9" 3.50
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post #2 of 4 (permalink) Old Sep 24th, 03, 08:36 AM
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Royce
 
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Are you going to run an electric fuel pump? If so I say you should go with a cell (in the trunk). If you are running a mechanical pump I would put a sump on your stock tank. It isn't hard to do but, make sure you clean the tank VERY well. I flushed mine several times and filled it with water while welding it. Dry ice works well (to prevent an explosion). The problem with running a sump on your stock tank with an electric fuel pump is, you need to mount the pump lower than the sump, in my case there wasn't a good place. I ended up going to a fuel cell, I was having fuel starvation problems with anything under 1/2 tank due to the pump not being low enough.

Royce (NO XQSSS) Bradley

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post #3 of 4 (permalink) Old Sep 24th, 03, 03:44 PM
 
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I have an electric pump on a stock tank, and it isn't lower than the tank, probably about right in the middle of the tank, and it works fine
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post #4 of 4 (permalink) Old Sep 25th, 03, 07:59 AM
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Royce
 
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Cody,
Where is the pick-up on your tank? Electric fuel pumpa push fuel better than pull fuel, the opposite is the case for mechanical (they pull better than push). I assume you are using the stock pick-up which comes from the top of the tank. In this case you are creating a syphon, once the pump is primed. This is a whole different issue when pulling fuel from the bottom of the tank (as he is talking about) with a sump.

In either case it is still recommended you mount the pump lower than the tank with a filter between the tank/cell and the pump.

Cody I am willing to bet you can not get all the fuel out of your tank with your pump above the bottom of the tank. You will begin to suck air well before your tank is empty. This is the whole reason someone would want to put a sump on a tank to begin with. Assuming you are using a stock style pick up once the fuel gets low enough to slosh (probably about the level your pump is mounted) your fuel pressure will begin to bounce (do you have a fuel pressure gauge?). The reason it bounces is because you are starting to suck air, this in not a problem when cruising around town but, get on it hard for more that a few seconds and you will feel the loss in performance. If your setup is working the way you want it that's great but, from experience the pump (electric) should be as close as possible and lower than the bottom of the tank/cell.

Also you should use a relay and fuse to wire an electric pump (or anything else that draws significant current, i.e. fans)

Royce (NO XQSSS) Bradley

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