Dan_s_young

iTrader: (1)

It's been a while since I have been working on my car. One of the biggest issues I have had with it is my fuel pump setup, and that had kind of discouraged me from continuing on the project for a bit... My goal now is to make the fuel system work, without hopefully breaking the bank too much as I now have some new priorities in life (I had a son born in Feb!!!). I am not going to be road racing the car, or any extreme use, mainly I will use it as a street car.

Currently the cars fuel tank has been modified to fit 2 walbro 255 lph pumps intank. 2, -6an line feed into an aeromotive fuel filter, before running up to the engine in a -10an line (over kill I know). The -10an line then splits into 2, -8an feeds which go into the KG parts fuel rails plumbed in parallel, and finally an aeromotive FPR. In order to fit both pumps, and in order to make it relatively safe with fuel slosh (to prevent a lean condition) a fuel slosh tank was welding into the bottom of the tank. The fuel return line (-8an) feeds fuel back to the top of the slosh cup. My issue with this setup is where the tank was cut in order to put the slosh cup into place I had issues trying to reseal it (just using anaerobic sealer) and most other sealers just melt away in the presence of gasoline. Therefore as the car was running I had a fuel leak, and didn't want to run the risk of lighting the car on fire...

After doing some research I now see that I have a few options and ways to try and finish this setup, and am looking for input...

1) I can try to revamp the current setup (kind of nice having the pumps already for this) - I have been thinking about jb welding (due to the cost and risk of welding a fuel tank) the cutout portion of the tank back into place (since its fuel resistant) and then sealing the tank with red-kote gas tank sealant in order to help further reduce the risk of a leak. Another challenge with this setup is going to be to mount both pumps to the fuel pump bracket and ensure they have enough space in the slosh cup as it is quite narrow. This would most likely be the most cost efficient way of tackling this. But also I am finding that the fuel tank looks pretty rough inside, I don't have any external leaks, but I'll add a couple of pictures. I watched Aaron Cake's youtube video on how to restore a fuel tank with Por-15 fuel tank sealer, and have tried to remove some rust with a chain/super clean and have tried rust remover but most of the gunk/rust is not coming off.

2) Or I could ditch the 2 pump setup, and go for something like a walbro 400 Lph pump, or a aeromotive 340lph stealth pump, eliminating have 2 pumps that could potentially fail and take out the motor from a lean condition. But I still then have the issue that the fuel pickup may suck in air. As well as the tank still being a bit rough, but that may be addressed with resealing the tank with Red-kote sealant.

3) Another option I have is running elwoods solution to this which consists of a lift pump style setup mounted in the tank. I guess my issues with this setup would be the price, and the fact that I still would have to cut, reseal and get the fuel tank tig welded to accommodate the setup. Also I would have to buy a second fuel pump that the lift pump would be supplying, so more cost.

4) Also there is BezRx7's option (https://www.rx7club.com/1st-generati...ation-1074909/) Using a RCI fuel cell, modifying it by tig welding a filler tube in, and running something like an aeromotive phantom setup. This solution would be the most expensive but the tank would be brand new...

5) I could also run 1 of the walbro pumps, supplying into a surge tank which then supplies fuel to another external pump. Also this setup would cost more money with a surge tank, another pump, as well as fuel would likely have to be plumbed inside of the car which is not idea for a street setup.

Here is a few pictures to show you guys what I am dealing with:

Here is the hole that was cut in the top of the tank, and the slosh tank that is welded in the bottom (it's hard to see but it has a hole in the side of it to accommodate some fuel flow in and out of it)


This picture shows some of the gunky crap on the bottom of the tank. Note that if I flush it out, the water comes out pretty clean so it may just look worse than it is?


This is section that has to be reinstalled back onto the tank


EDIT: I forgot to mention I would like the fuel setup to support 400 RWHP and be reliable.