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Fuel Slosh Issues Part 2. New solution by Holley revealed.

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Fuel Slosh Issues Part 2. New solution by Holley revealed.

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Old 05-30-16, 02:48 PM
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We'll see if this works out. For those concerned about pump noise in hatch, fuelab has a 3rd wire on pumps that controls the speed via PWM. They have an accompanying fuel pressure regulator that will auto adjust pump speed via flow sensor so you're running minimal speed at all times.

Walbro in stock location for pick-up







Cool thread

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Old 05-31-16, 12:36 AM
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Originally Posted by Monsterbox View Post
We'll see if this works out. For those concerned about pump noise in hatch, fuelab has a 3rd wire on pumps that controls the speed via PWM. They have an accompanying fuel pressure regulator that will auto adjust pump speed via flow sensor so you're running minimal speed at all times.

Walbro in stock location for pick-up







Cool thread
Rather not mess with the voltage, but the issue was also about If you have the fuel in the back of the car like that, you'd have to close off the cabin from the back, like aaron (manny) in his drift car because of regulations.
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Old 05-31-16, 01:39 AM
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FWIW, I have seen a solution that involves using a second stock fuel pump assembly mounted into (AFAIK) a simple aluminum container. It doesn't involve any fancy AN fittings and expensive steel-braided hoses, either.

I'm sure there's a bit of wiring involved (and you'll need a stock connector pigtail) since you're using two pumps, but this is probably the cheapest, simplest solution.
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Old 06-01-16, 01:56 PM
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Think there is a way to fit a pit behind the rear subframe? Looks like there is some room
Attached Thumbnails Fuel Slosh Issues Part 2. New solution by Holley revealed.-20160601_135232.jpg   Fuel Slosh Issues Part 2. New solution by Holley revealed.-20160601_135238.jpg  
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Old 06-06-16, 12:23 AM
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Just realized the weird word my phone added..asked if a surge tank or some sort could be mounted there
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Old 06-06-16, 08:03 AM
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Originally Posted by FD3S2005 View Post
Rather not mess with the voltage, but the issue was also about If you have the fuel in the back of the car like that, you'd have to close off the cabin from the back, like aaron (manny) in his drift car because of regulations.
To pass regulations, the surge tank could just be moved in front of battery at spare tire well, potentially put battery elsewhere and then a cover could be made over the spare tire well out of aluminum etc.





Check out Damian's track rx7 the yellow one. He has exactly that as a surge tank setup in his spare tire well, its excellent.

Regarding voltage,
I ran two, walbro 400lph. The car would overheat the fuel and experience slight cavitation/fuel pressure drop from the increased fuel heat and lower fuel density as it decompressed into the tank. This would have gone unnoticed if it wasn't for mechanical fuel pressure gauge showing the pulsations of the cavitation, and the fact that the trunk was not insulated with carpet, so that the increased whining from pump could be heard.


Anyhow, the only way to solve the issue entirely was to install an external pump speed controller. Doing another fuel system, excited to see if this regulator can live up to its job; controlling the speed of the pump, without any necessary controller or relays/wiring etc. Its pretty simple, just a wire to the regulator and you never have to worry about pump staging, extra relay wiring, or cavitation/vapor lock.

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Old 06-06-16, 09:21 PM
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So, I just ordered the hydramat the 15" x 8" cross and I'm going to see what I can do with it. Unfortunately when I had my gas tank redone, they removed the stock bucket in it. So I could try just using the hydramat or I'll try to make some sort of little bucket or whatever at one end of the mat.
If anyone has another idea that would be super. As for track use, I'm just going to be using it for autocross and the occasional track day.
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Old 06-06-16, 09:30 PM
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Fuel Slosh Issues Part 2. New solution by Holley revealed.

Originally Posted by connor. View Post
So, I just ordered the hydramat the 15" x 8" cross and I'm going to see what I can do with it. Unfortunately when I had my gas tank redone, they removed the stock bucket in it. So I could try just using the hydramat or I'll try to make some sort of little bucket or whatever at one end of the mat.
If anyone has another idea that would be super. As for track use, I'm just going to be using it for autocross and the occasional track day.
With the bucket removed, you should have a little more room.. not sure, but maybe could of fit a bigger mat.. I am thinking of running 2 for both my pumps
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Old 06-06-16, 09:47 PM
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Originally Posted by FD3S2005 View Post
With the bucket removed, you should have a little more room.. not sure, but maybe could of fit a bigger mat.. I am thinking of running 2 for both my pumps
Ya, I thought about that but the only other one that is longer is $400 more. the cross shaped one with the offset fitting seemed like the best option since I'm running an in tank pump.
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Old 06-07-16, 07:30 PM
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Originally Posted by connor. View Post
Ya, I thought about that but the only other one that is longer is $400 more. the cross shaped one with the offset fitting seemed like the best option since I'm running an in tank pump.
I'm running an in tank pump aswell . (2 of them) I'd gladly pay 5-600 if the Matt would fit and have 2 fittings for 2 pumps.
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Old 05-05-17, 01:02 PM
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Has anyone confirmed if you can pre-mix or not? Their website still says its good to 20:1.
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Old 05-05-17, 01:20 PM
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The one I'm using seems to be working fine with premix. I use about 1oz/gal.
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Old 05-08-17, 07:36 PM
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yes It's been stated before you can premix with no issue
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Old 05-09-17, 02:38 AM
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Originally Posted by FD3S2005 View Post
yes It's been stated before you can premix with no issue
I'm always leery until I hear some success stories from end users. So I'm a little more at ease hearing that it's working so far for at least one person.
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Old 05-09-17, 04:20 AM
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Running one in an in-tank trap @ 100:1 with an ethanol mix, it's fine.
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Old 05-11-17, 11:22 PM
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Here is the feed back direct from Holley. Sadly it does not play well with Pre-Mix.
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Old 05-12-17, 01:12 AM
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That was back in 2015, I'm wondering if they changed anything to make it work since they now say it works up to a 20:1 ratio.
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Old 05-14-17, 07:17 PM
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ive been tracking my FD with one for a while now no problems so far. premixing 1oz/gal. if it was leaning out the oil mixture, i would think it would have shown fuel starvation from oil buildup by now, but all seems ok

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Old 05-14-17, 07:43 PM
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Originally Posted by gxl90rx7 View Post
ive been tracking my FD with one for a while now no problems so far. premixing 1oz/gal. if it was leaning out the oil mixture, i would think it would have shown fuel starvation from oil buildup by now, but all seems ok
Maybe give the filter a check to see if it's getting clogged at all with the residual oil, last I heard it was ok up to a certain amount
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Old 05-14-17, 08:08 PM
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Originally Posted by gxl90rx7 View Post
ive been tracking my FD with one for a while now no problems so far. premixing 1oz/gal. if it was leaning out the oil mixture, i would think it would have shown fuel starvation from oil buildup by now, but all seems ok
Is your OMP operational, or has it been removed?

Just curious...
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Old 05-15-17, 08:41 AM
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Old 05-16-17, 11:20 AM
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Looking forward to hearing more feedback. My 93 still has its baffles intact and with the hyperion cover I don't have any starvation issues so long as I keep it above 1/4tank. Given how I drive the car I don't expect the baffles to hold very long. A 99 spec tank would be nice but im guessing its $$ and difficult to find, and I doubt my hyperion cover will fit.

The cross shaped mat would seem to be most effective but even the straight would seem to suffice. Especially if I keep the hyperion cover a long with. How strong are the magnets? And is this shape offered with the hose type attachment which will fit a walbro 400?
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Old 05-16-17, 12:40 PM
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There is no chance of getting a hyperion cover, right? I want to say the guy who sold them hasnt been on the forum in quite a few months now.
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Old 05-16-17, 01:06 PM
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Originally Posted by ArmenMAxx View Post
Looking forward to hearing more feedback. My 93 still has its baffles intact and with the hyperion cover I don't have any starvation issues so long as I keep it above 1/4tank. Given how I drive the car I don't expect the baffles to hold very long. A 99 spec tank would be nice but im guessing its $$ and difficult to find, and I doubt my hyperion cover will fit.

The cross shaped mat would seem to be most effective but even the straight would seem to suffice. Especially if I keep the hyperion cover a long with. How strong are the magnets? And is this shape offered with the hose type attachment which will fit a walbro 400?
I think the JDM tank is $600 + $150 shipping from JDMland. The hyperion cover can be made to fit, but it doesn't fit the tub perfectly on the newer tanks. The newer tanks actually have a top plate similar to hyperion, but not as closed off.

Originally Posted by briansfd View Post
There is no chance of getting a hyperion cover, right? I want to say the guy who sold them hasnt been on the forum in quite a few months now.
You can find one used, but hyperion is long gone.
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Old 05-16-17, 08:28 PM
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Originally Posted by Narfle View Post
I think the JDM tank is $600 + $150 shipping from JDMland. The hyperion cover can be made to fit, but it doesn't fit the tub perfectly on the newer tanks. The newer tanks actually have a top plate similar to hyperion, but not as closed off.You can find one used, but hyperion is long gone.
I was one of the first to get the cover for the baffle. I still have it on the car but I still get starvation on left turns when under half tank.. going to have to go with a surge tank or try that hydramat
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