Guest Anonymous Posted November 13, 2001 Share Posted November 13, 2001 I'm putting a 1989 mustang 5-0 engine in my 240z and I plan on modifying the stock fuel tank with a weld-on sump. I know I could substitute a 76-78 tank that was designed for efi but there are no good examples around here used and I think this is the easiest way to go. Plus I waant a 3/8 outlet for my 302 and I don't think the 260-280 tanks ar that big. I don't need a fuel cell right now either, I just want to have a reliable fuel source for the efi. Summit sells a weld-on sump for about $50 U.S. but it looks very easy to fabricate and I plan on doing it myself. Questions: 1) I can use a properly situated male hose fitting as my pickup, I don't need to have any other kind of internal tubing added to this male hose fitting, right? 2) I plan on welding shut (after properly cleaning and hot tanking tank, of course) all the stock tank hose outlets. I will need some kind of vent to prevent vacuum building up inside the tank. Will a simple vented gas cap work? And if pressure builds up inside the tank on a hot day this doesn't need to be vented does it? Sorry for the dumb questions, I probably could have found the answers for these by searching around the internet but I have no pride and don't mind displaying my ignorance in the quest for knowledge...Thanks!! Quote Link to comment Share on other sites More sharing options...
Dan Juday Posted November 14, 2001 Share Posted November 14, 2001 I did that. Here is a pic. Here is a link to what I did with it. http://www.zparts.com/showcase/djudayv8proj/index.htm I DID NOT cut out the bottom of the tank. I just drilled two large holes. This makes the bottom of the tank a baffle as well. Quote Link to comment Share on other sites More sharing options...
Guest Anonymous Posted November 14, 2001 Share Posted November 14, 2001 Excellent, thanks guys. Quote Link to comment Share on other sites More sharing options...
Mike kZ Posted November 14, 2001 Share Posted November 14, 2001 I've done this exact thing you want to do to my 240Z tank. I had to modify the sump a little at the back, it was too long, I had to cut small slits and bend the back up to match the tank. As per the instructions you have to cut about 5 ,2" holes on the bottom of the tank, then place the sump over the holes and weld. Make sure you hot tank it first!! Question 1 , yes you can use a male fitting, but for the return line I added a small length of tube inside the tank to the back. This way you won't get turbulance at the outlet since they are side by side. Question 2 , I welded shut the old lines and all the vent lines except the one at the top facing the front of the car. I took out the vent tank, and ran a hose from the tank to the inlet on the down spout near the cap. I drilled a small hole in the cap to help vent a little, but I don't think the cap seals that good anyhow. This seems to work so far. Check my site there is a pic of the tank. Quote Link to comment Share on other sites More sharing options...
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