How do you ensure you have enough fuel flow down into a sump installed on a factory fuel tank? I have an 8" x 8" x 3" sump feeding an Eliminator pump with a 3/4" NPT fitting (-12 line). Can a guy drill a bunch of 1/2" holes into the tank.... or should one cut a big hole like a 2" x 6" to absolutely make sure the fuel drops into the sump quick enough?

Any experiences or wicked formulas for this?

Thanks for helping.

Bryce

 

Your hole drilling idea is best. I'd get a 3/4" hole saw if it was me. You don't have to get crazy, just keep any potential sloshing to a minimum.I'm glad that you're thinking about it to keep your Eliminator happy. Make sure if you run a filter on the inlet that it is no finer than 100 micron. After welding, check integrity by filling the tank with water first, you may be glad you did.

Mark

 

Do you think that 25 - 1/2" holes.... and 17 - 1/4" holes, would do the trick?

 

Yep.

 

Water in a metal tank??

Is that okay to test weld integrity with??

 

Another approach... -10AN radiused inlet fuel fitting welded directly to the tank, baffle and screen welded inside the tank.

http://cjcfo.fbody.com/members/injun.../DCP03576a.jpg

 

Yep, water is the recommended "test fluid". You're supposed to empty the tank after testing...lol. Are you worried about rust or something?

 

Over a period of time I figure it might, but I hey learn something new every day. Thanks.

 

If you put gas back in it and don't let the water sit in there for any period of time, the rust problem is non-existent. Just be careful welding on the gas tank because of vapor that may still be contained after draining.

-Shannon

 

Good tip, I had to learn that one the hard way

 

I just did mine how Comp Engineering said to do it in their directions.

http://www.quarter-mile.net/TA/image...fueltank01.gif
http://www.quarter-mile.net/TA/image...fueltank02.gif
http://www.quarter-mile.net/TA/image...fueltank03.gif

I did cut out the old 3/8" fittings and replaced them w/ manly 3/4" fittings. Grrr.

I had a radiator shop flush and clean the tank before I did any work. It sat in my garage for a couple months, but I wanted to be safe. I also had them clean and pressure test it after I was done.

 

Eastwood offers some nice finishing products for tanks. Check out this URL:

http://www.eastwoodco.com/shopping/s...yword=gas+tank

 

just did mine for an a1000 here's what i did
bought a aeromotive prefilter for the pump and filter for before the regulator
bought a -6 and -10AN steel bulkheads from the parker store.

pulled the tank, pumped out the remaining gas, aired it out without the stock pump assembly on it, then filled it with water to displace the gas, overflow the tank and empty.

ok, i opted to install bulkheads directly into the tank, no wedge tray, one main reason is out gas tanks naturally slope rearward unlike most other vehicles. put your gastank back into the car and decide where you want the bulkheads, mark them with a paint marker. i tucked the return line farthest back and the pump line facing more downward, i'm using a 90 degree elbow to go directly into the first filter, then a peice of line to the pump and forward to the front. the smaller line is attached with a 90 directly to the bulkhead and tuckes nicely back.

ok pull the tank, add water again and cut some holes... we used a plasma cutter
weld in the fittings and test for leaks. once she's pretty much sealed you may want to solder or braze over the top of the weld to insure the seal, put a light coat of paint over it all so it don't rust and empty the water.

oh, i cut out the old plastic baffle as well, you'll see it.
plug your old fuel lines out the top and keep the vents open, once tank is dried reinstall it and your all set.

i just got back in from putting my tank back on the car, if you want pics i can do that soon..

ttyl
mike

 

Very nice.

Your fish are killer, has to be a ton of work.

Are you really going to stab the viper motor in the camaro?

 

yeah, i decided to cut down to just my angels, too much going on this summer. trying to finish the car and get my boats together.

viper motor is a dream, i'll do it if i can ever afford it, right now i have my doubts. got a good start on it though, for now it's just decoration.!

i'll try for some pics tonight, none are recent on my site.

later,
mike