I'm having a fuel tank custom built for the car and could use some opinions. Do you guys think the baffle in this would be sufficient? This is a 100% street car with a few trips down the track with a goal of an 11.9x timeslip. Car has a Holley Sniper which runs great, but I've always had a fuel starvation problem with the factory tank and external pump. Last time at the track it sucked air off of the launch. New tank will have the pump internal. Thanks guys.

Where is the pickup going to be? Holley also sells product you might want to look into. pricey but ? HOLLEY HYDRAMAT

Pickup is going towards to the top above the V baffle. I looked at the Hydromat including the Aeromotive retrofit pump with the sponge baffle, but decided on a custom tank in the end. The old tank was too wide to run 3" dual exhaust out to the bumper on either side. This new one is a couple inches narrower in dimension.

Roundy round fuel cell foam blocks are supposed to help with fuel equalization issues under G forces, however those circle track tanks usually have a large screw-on cap at the top big enough to get the foam inside. If what you are building has too small of an opening the blocks may not fit? The blocks are not cheap if you need a lot of them also.

Some F.A.S.T. racers use this so they can run as little fuel as possible.

I'm thankful for opinions, but the advice is a bit more race oriented. I'm just looking for opinions on the internal baffle structure before the lid gets welded on. Car isn't a circle track runner or road course carver. Only track it'll see is the occasional quarter on test and tune nights. With the stock unbaffled tank it would suck air just pulling into a parking lot with a 1/4 tank of fuel.

If I wanted to see how it would work I would get some clear sign acrylic and temporarily attach it to the top with some colored water in the tank. Slosh it around and see what you have going on.

Good idea Neil,
Myself I don't understand the concept of the V baffle. Yes it will slow the fuel down but not stop it from going to the opposite end of the tank. there are a lot of variables involved. I would think a partition with a series of holes (size to be determined) would be
more effective. if the V were welded to the bottom of the tank it would also add strength when the tank is full. This is why you see most serious drag cars with a sump at the back ant the pickup on the bottom.

i would look at a factory efi pump, and add a "can" type of thing around the fuel line pickup point that would capture a certain amount of fuel to make sure there would not be a problem with starvation.
as to the baffle holes, i would select a size, then use dimple dies on the holes. maybe switching the die every other hole. in my [feeble] mind's thinking, this may slow the back and forth sloshing quite a bit.

Markz I
m thinking your V baffle isn't going to help much when the fuel level is much below a 1/2 a tank (which I suspect most of your issue is at) with out it being at least partially connected to the bottom of the tank.
As stated, the modern fuel injection tanks have a semi circular baffle within about an inch of the fuel pickup, around about 3/4 of the diameter of the pickup. The walled side would be around the side most likely to allow the pickup to become uncovered. That baffle would only need to be around 1" of the bottom of the tank. you want it to slow down the movement of about a 1/4 gallon of gas around the pump pickup.

Your V baffle would be very helpful for keeping the fuel from sloshing forward or backward during fast takeoff or fast braking, but I don't believe it will help your momentary fuel starvation when the fuel level is below 1/2 a tank.

You can run the stock tank or the one you are making with a surge tank set-up and you'd never get cavitation in your fuel system again.

The system would use Holley Hydromat with an in-tank pump that's connected to a surge tank with an equal sized return back to the tank. The fuel will then circulate at near zero psi, but at high volume. Alone you can still get cavitation as you have been experiencing it, but the air bubbles are quickly returned to the tank from the surge tank itself.

Your main fuel pump then goes into the bottom of the surge tank, up to the motor where it bypasses at the pressure regulator what is not used and sends it back to the surge tank.

This system eliminates virtually all air from the fuel system even when you are down to the last gallon of fuel. Works for EFI & carburated fuel systems. I run the low pressure side through two, high volume water traps/filters.

Not with a hydramat.

Unless you were idling for an extended time on a relatively steep slope that is hard to understand. Can you explain a bit more?

I would would say the location / height of the pickup was at fault. I know my Charger would suck air under 1/4 tank when romping on it hard but it wasn't immediate maybe top of 1st or midway through 2nd?

This is what I had cobbled together during the Sniper install. It's a really shallow tank. Under a 1/4 tank basic maneuvering in a parking lot or mild acceleration would cause it to suck air. I did make sure the new pickup could touch bottom.

Honestly though, making the old tank work wasn't even in the cards. It's so wide the pinch seems interfered with the exhaust pipes as it wasn't designed for duals. The secondary goal of the new tank was to make room for 3" pipes on either side.

Probably just going to have the fabricator finish it off with a circular baffle around the pump and call it good.

Hydramat will solve any issues with sucking air. With baffles you won’t really know until it is together and hit it. I have absolute confidence in the hydramat. Even though you car isn’t a race car it is suffering from a race car issue. I went from having to run over 1/2 tank down to 2 gallons in a stock tank with hydramat. I can run so little fuel that I have pulled it into the trailer, left it in the trailer for a week and the fuel slowly drains out of the hydramat and it won’t start. Shake the car a bunch and slosh the fuel and it will fire right off.

Because it is fuel injected it will be very sensitive to fuel supply dips in pressure.