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Old 04-21-2012, 03:57 AM   #1
02PRUV
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Twin Intank Pumps

I thought someone had done twin intank pumps before but doing a search I can't find it.

Anyone remember who did it and if there were pics of it.

I need to do something now because I've run out of fuel at 500whp @ 15psi on E85 with one pump today.
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Old 04-21-2012, 05:26 AM   #2
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Originally Posted by 02PRUV View Post
I thought someone had done twin intank pumps before but doing a search I can't find it.

Anyone remember who did it and if there were pics of it.

I need to do something now because I've run out of fuel at 500whp @ 15psi on E85 with one pump today.
You dont need two pumps, just one big one. Check with HPF to see if this one is big enough. They offer bigger ones..
http://www.horsepowerfreaks.com/part..._In_Tank/16889

From what I can find out, the 255lph is just adequate for your situation. That means you should look for a 300lph pump that fits in tank, if such a beast exists. E-85 is tricky. My info is from reports i read not from a real expert. Check with a really knowledgeable tech. But I think I got you in the ball park at least. GL.
(My pump is 1250 lph!)

EDIT: Bimmerworld offers dual in tank pumps, but for starvation reasons. You give up your fuel gauge when you use them.
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Old 04-21-2012, 05:37 AM   #3
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Why dont you want a inline pump ? is it because of noise ? Just put a bosch 044 inline


What pump do you have in your tank ?
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Old 04-21-2012, 06:29 AM   #4
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Originally Posted by Bdave View Post
You dont need two pumps, just one big one. Check with HPF to see if this one is big enough. They offer bigger ones..
http://www.horsepowerfreaks.com/part..._In_Tank/16889

From what I can find out, the 255lph is just adequate for your situation. That means you should look for a 300lph pump that fits in tank, if such a beast exists. E-85 is tricky. My info is from reports i read not from a real expert. Check with a really knowledgeable tech. But I think I got you in the ball park at least. GL.
(My pump is 1250 lph!)

EDIT: Bimmerworld offers dual in tank pumps, but for starvation reasons. You give up your fuel gauge when you use them.
LOL I have a 320lph in tank pump now and it's the one that has run out. I really need two of these.
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Last edited by 02PRUV; 04-21-2012 at 06:31 AM.
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Old 04-21-2012, 06:32 AM   #5
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Originally Posted by basar13 View Post
Why dont you want a inline pump ? is it because of noise ? Just put a bosch 044 inline


What pump do you have in your tank ?
DeatschWerks DW300. Not a fan of inline setup. Not even a fan of twin pumps. But I'd rather do twin than inline.
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Old 04-21-2012, 06:45 AM   #6
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DeatschWerks DW300. Not a fan of inline setup. Not even a fan of twin pumps. But I'd rather do twin than inline.
Do you have it wired directly to the battery?
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Old 04-21-2012, 07:05 AM   #7
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Do you have it wired directly to the battery?
LOL yes. Like I have said many times and people don't want to believe me this is around the 800whp mark on a US dynojet. It's out of pump.
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Last edited by 02PRUV; 04-21-2012 at 07:09 AM.
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Old 04-21-2012, 07:13 AM   #8
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LOL I have a 320lph in tank pump now and it's the one that has run out. I really need two of these.
E85 can be crazy in its demands. I did not want to take a chance and went BIG when I made the decision on my fuel cell pump. I bought the one with the built in eliminator, 1250lph.
I have heard great things about DeatschWerks pumps. One guy is running 3x300lph on his project.
So, 02PRUV, you think 2x300lph should be plenty for 500hp on E85? Or the OEM plus an inline 300lph DeatschWerks?

I have not hear much about twin in tank pumps except for the Bimmerworld set up.

Edit: if u are at 800rwph u will need 3x300lph or a single 1000lph pump. I assume you are trying to feed 2150cc injectors? 1100cc injectors dont need near as much fuel.
You need to be looking at some type of pump controller working on a wave modulation principle like Aeromotive's pump controller.
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Old 04-21-2012, 07:27 AM   #9
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E85 can be crazy in its demands. I did not want to take a chance and went BIG when I made the decision on my fuel cell pump. I bought the one with the built in eliminator, 1250lph.
I have heard great things about DeatschWerks pumps. One guy is running 3x300lph on his project.
So, 02PRUV, you think 2x300lph should be plenty for 500hp on E85? Or the OEM plus an inline 300lph DeatschWerks?

I have not hear much about twin in tank pumps except for the Bimmerworld set up.

Edit: if u are at 800rwph u will need 3x300lph or a single 1000lph pump. I assume you are trying to feed 2150cc injectors? 1100cc injectors dont need near as much fuel.
You need to be looking at some type of pump controller working on a wave modulation principle like Aeromotive's pump controller.
I was thinking 2 x 320lph DeatschWerks in tanks should get me around the 600whp @ around 20psi on E85 which is about all I will push it.

It's feeding ID1000 injectors @ 45psi base fuel pressure.

My injectors were at 80% duty cycle at this hp. So whatever it gets with an extra pump is all it's going to get.
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Last edited by 02PRUV; 04-21-2012 at 07:34 AM.
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Old 04-21-2012, 08:01 AM   #10
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Originally Posted by 02PRUV View Post
I was thinking 2 x 320lph DeatschWerks in tanks should get me around the 600whp @ around 20psi on E85 which is about all I will push it.

It's feeding ID1000 injectors @ 45psi base fuel pressure.

My injectors were at 80% duty cycle at this hp. So whatever it gets with an extra pump is all it's going to get.
Only 1000cc? Yep..2x320 is fine.
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Old 04-21-2012, 09:22 AM   #11
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Maybe this.....
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Old 04-21-2012, 02:28 PM   #12
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Originally Posted by 02PRUV View Post
I thought someone had done twin intank pumps before but doing a search I can't find it.

Anyone remember who did it and if there were pics of it.

I need to do something now because I've run out of fuel at 500whp @ 15psi on E85 with one pump today.
really what pump?
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Old 04-21-2012, 02:30 PM   #13
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DeatschWerks DW300. Not a fan of inline setup. Not even a fan of twin pumps. But I'd rather do twin than inline.
weird I have the exact same pump and I have plenty of room to go higher at 500 rwhp, i am also using e85 and fic 1100 injectors.
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Old 04-21-2012, 06:51 PM   #14
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weird I have the exact same pump and I have plenty of room to go higher at 500 rwhp, i am also using e85 and fic 1100 injectors.
That's cause 500whp in the US is about 380whp here. So yes you wouldn't be out of pump at that horsepower. If you got it up to 750-800whp on a dynojet you would find your out of pump.
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Old 04-21-2012, 06:59 PM   #15
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Maybe this.....
That looks impressive but I'm not a fan of inline pumps. I have found problems before when the intank pump can't supply enough fuel to the back of the inline pump it has really bad side affects.

I've also seen it where pressure builds up between the pumps and super heats the fuel and gives the inline pump a heart attack.

These are the two reasons I don't like inline pumps.

What I want to try and do is do twin pumps on the factory fuel pump hanger in the tank. I thought I'd seen it done before on here but maybe I'm thinking of somewhere else. Might not of been a BMW.
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Old 04-21-2012, 08:19 PM   #16
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That looks impressive but I'm not a fan of inline pumps. I have found problems before when the intank pump can't supply enough fuel to the back of the inline pump it has really bad side affects.

I've also seen it where pressure builds up between the pumps and super heats the fuel and gives the inline pump a heart attack.

These are the two reasons I don't like inline pumps.

What I want to try and do is do twin pumps on the factory fuel pump hanger in the tank. I thought I'd seen it done before on here but maybe I'm thinking of somewhere else. Might not of been a BMW.
I've heard of using another fuel pump hanger assembly on the driver's side.... doubling up with a pump on each side. You lose the syphon system, and the fuel level sender, but I don't think this would be a worry for you?

I've also seen some people tap into the side of the plastic fuel tank with a bulkhead fitting and an inline pump....but I think this is a really bad idea.
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Old 04-21-2012, 08:38 PM   #17
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Originally Posted by PEI330Ci View Post
I've heard of using another fuel pump hanger assembly on the driver's side.... doubling up with a pump on each side. You lose the syphon system, and the fuel level sender, but I don't think this would be a worry for you?

I've also seen some people tap into the side of the plastic fuel tank with a bulkhead fitting and an inline pump....but I think this is a really bad idea.
I think much better than running two pumps or modifying anything in the tank is doing what you did in the trunk. I think the OP should look more into surge tank methods of supplying fuel. The double pickup is something that has been done, but I wouldn't put the pumps inside the tank, the above fuel system is gorgeous, I would try to emulate that if i didn't want a surge tank.
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Old 04-22-2012, 07:40 AM   #18
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I've heard of using another fuel pump hanger assembly on the driver's side.... doubling up with a pump on each side. You lose the syphon system, and the fuel level sender, but I don't think this would be a worry for you?

I've also seen some people tap into the side of the plastic fuel tank with a bulkhead fitting and an inline pump....but I think this is a really bad idea.
Something like this?one pump each side
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Old 04-22-2012, 08:03 AM   #19
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Something like this?one pump each side
Yep. I am pretty sure that would make the OP happy. Looks fine. But you lose your gas gauge dont you? Your fuel level sender is where you hang the second pump, correct?

This is Bimmerworld version:
http://store.bimmerworld.com/e46-fue...kits-p343.aspx

no pix however...

I did find this pix of an OEM set up showing the fuel float sender located in the second fuel tank port:

http://forums.bimmerforums.com/forum...d.php?t=752438

The dual pump set up solves fuel starvation. You COULD rig up a sender based on a whole custom set up. They make all kind of ways to to read fluid levels. You may have a remote gas gauge, but it would be better than nothing.
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Old 04-22-2012, 11:18 AM   #20
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[QUOTE=Bdave;14317429]Yep. I am pretty sure that would make the OP happy. Looks fine. But you lose your gas gauge dont you? Your fuel level sender is where you hang the second pump, correct?

Fuel gauge works fine,on both fuel pump holders there is a connection wich meassures the fuel level.
I will try to make a picture of it.
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