ITB conversion - in tank pump

Turn & Burn

Club Member
I’ve been playing with this idea for ages, rather than go for an LP feeding a swirl pot and HP pump I thought I’d have a go at an in-tank HP pump, basically like all cars these days. It’s taken ages mulling which pump to try but I’ve taken the plunge with a Scooby WRX pump which should have capacity for anything an L series can deliver.
Ive attached a few pics of progress so far this afternoon, I hope I’ve not made a terrible mistake cutting a really solid tank!
Coming up with a suitable baffle design has been interesting, but hopefully should work ok......
 

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Mr.G

Club Member
I don't think you should worry about cutting the tank, you've done an excellent job there...

I like the baffle design too.
 

moggy240

Insurance Valuations Officer
Staff member
Club Member
my mate is fitting an Aeromotive in-tank fuel system as used by youtube channel Mighty Car Mods on the their fairlady Z .this might give you a better idea.
psi_18688.jpg
 
e36m3 fuel pumps would be a good option. they delivery 5 bar, are made for a high revving N/A application. They actually use two, one for each side of the tank. On my last kit car, with an m3 engine I did the same as I had fuel surge issues, even with a baffled/sumped tank. No issues after that, even down to the last 3ltrs of fuel.

Fuel level sensor built in also.

https://www.ebay.co.uk/itm/Fuel-Pum...en:E36&hash=item3b2c22fb77:g:ztkAAOSw1dxcd43U
 

IbanezDan51

Well-Known Forum User
H
e36m3 fuel pumps would be a good option. they delivery 5 bar, are made for a high revving N/A application. They actually use two, one for each side of the tank. On my last kit car, with an m3 engine I did the same as I had fuel surge issues, even with a baffled/sumped tank. No issues after that, even down to the last 3ltrs of fuel.

Fuel level sensor built in also.

https://www.ebay.co.uk/itm/Fuel-Pump-Assembly-For-BMW-E36-Series-316i-318i-318is-320i-323i-325i-328i-M3-New/254143560567?fits=Plat_Gen:E36&hash=item3b2c22fb77:g:ztkAAOSw1dxcd43U

How would this be retained? It would be in a lastic tank original I assume so harder to fit to a metal tank?
 

moggy240

Insurance Valuations Officer
Staff member
Club Member
I only mentioned the aeromotive pump as you can clearly see the swirl pot section , as that is the important bit as it needs to keep fuel in it for the pump. The 300zx one was just a plastic square pot fastened to the bottom for the fuel tank with a hole in the side for the fuel pump to sit in. I might be able to get some sizes and better pictures of the aeromotive one if that will help you as he has not fitted yet
 

Mr.G

Club Member
you can buy the adapter rings, I had them tigged onto an alloy tank. For the next one, I ran the retainers off in a lathe, made a rubber gasket and made a compression fixing across the top.
I have one of those adapter rings for sale if anyone wants one...I was going down that route but decided to not go for an internal pump in the end, just had baffles welded in the tank instead. PM me for more details if of interest.
 

Turn & Burn

Club Member
There’s so much choice with this, I like the BMW one very similar to the Subaru one in style, but it also has no surge pot or baffles, these must be in tank already?
My other option is Fiesta ST which I’ve also got, this has an integral catch pot and a pump that can be uprated.
Again this needs a flange made but easy enough to sort.
 

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Turn & Burn

Club Member
e36m3 fuel pumps would be a good option. they delivery 5 bar, are made for a high revving N/A application. They actually use two, one for each side of the tank. On my last kit car, with an m3 engine I did the same as I had fuel surge issues, even with a baffled/sumped tank. No issues after that, even down to the last 3ltrs of fuel.

Did u still baffle inside the tank?
 

Turn & Burn

Club Member
I only mentioned the aeromotive pump as you can clearly see the swirl pot section , as that is the important bit as it needs to keep fuel in it for the pump. The 300zx one was just a plastic square pot fastened to the bottom for the fuel tank with a hole in the side for the fuel pump to sit in. I might be able to get some sizes and better pictures of the aeromotive one if that will help you as he has not fitted yet

I’ll have a look on the aeromotive site, but a few pics of the swirl section would be great. I wateringly expensive kit!
 

johnymd

Club Member
Are all the 240/260 tanks baffled as standard? I know most of the ones I've looked inside are. Maybe just add trapdoors into the baffles that are already there?
 

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Turn & Burn

Club Member
Pic attached, mines definitely baffled. That’s a good idea. U may still have to deal with front to rear slosh. It may be an extra insurance on mine as I’ve welded in my baffles now.

Finished the top yesterday. Likes pretty neat apart from outlets face the wrong way so I’ll have to have a hose loop
 

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moggy240

Insurance Valuations Officer
Staff member
Club Member
There are few videos on YouTube of people fitting the Aeromotive one. I won't be back at my mates house to take pictures for at least a month.
How high will the fuel pick up be with your subaru pump off the bottom of the tank.
 

Turn & Burn

Club Member
I’ve cut the tank so the pump filter is pushed onto the tank base, it couldn’t go any lower. The baffles are 3” high.
Out of interest the standard fuel pickup is at least 1” above the base.


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