Bosch 044 intank or inline info.

[Scuba]

Hi,

I have been reading loads on various threads about peoples fuel setups.
Im sure this has been discussed before but i cant quite get my head around it.
I have decided I want an 044 now need to think setup.
Car setup will be T51, half bridge, 850cc 1600cc injectors, looking for an easy 500+hp on 1.4bar safe tune.

Which fuel pump setup is best and why?

I am interested on hearing peoples opinions.

from what i can gather at the moment i get to this;
please correct if wrong?

bosch 044 in tank setup (forget ease/difficulty installing and wiring I am more than capable)- To me appears a good way to go, many have done this.
although some point out is it wise/safe running high pressure fuel lines the length of the car?
however my main concern is most/all apear to suffer with fuel starvation (especially left hand corners) can this simply be fixed by baffels in the tank? or surge tank/swirl pot (whatever people want to call it)? or both?

044 inline- high pressure only in engine bay, although costly as need to buy another pump eg walbro to pump volume to surge tank in engine bay (I assume factory pump wont be good enough to supply the volume)?

Thoughts please?

[rx7boy]

Standard pump is suitable as a tank lift pump, under low pressure it will flow enough to supply the 044, 300lph to be precise,

For you setup the stock fuel pump feeding a surge/swirl tank with an 044 in-line feeding the rails.

Make sure the line from the swirl tank to the 044 is no smaller than 12mm ID

Also you will require a decent fuel pressure regulator, aeromotive/fuelab or similar.

[Scuba]

thanks for the reply. thats valuable information.

Just curious as to why people run 044s intan then? what are the benefits? because that setup seems far simpler?

[rx7boy]

You are correct it\'s a simple setup that costs the least. You do tend to suffer from fuel surge unless your very lucky with your install when running an 044 in tank.

Running a swirl pot also gives you the added surge protection during heavy cornering :3gears-lh

[Scuba]

That is all good info.
But where I\'m struggling to understand is by running an intank 044 with swirl pot its cheap and simple. However less than 1/4 tank appears the pump sucks air on occasion which doesn\'t sound at all good to me?
But the setup you mentioned with factory as lift pump to swirl pot. Then 044 inline seems just as cheap and simple. Plus a bit safer as you dont have high pressure fuel lines running the length of the car.
So my question really is: option 2 seems far easier safer and simpler to me? Why do people mess around running intank?

Dont want to confuse any further. But the option you suggested with lift pump. Does the pump need modifying to produce that 300lph volume flow?
Also do the fuel lines from the tank to swirl pot need upgrading? Or just be sure to use the larger lines from the swirl pot round the high pressure circuit, by that i mean; swirl pot to 044, fuel rail, fpr, back to swirl pot?

Thank you for your help think you have helped me decide the best way to go here for me

[Scuba]

The more i think about it. I have to agree your suggested setup is best for me.
Sorry to state the obvious. But just so its as clear as mud in my mind.
I run factory fuel pump in tank. (Do i need to adjust pump pressure or just leave it alone)
I run factory fuel lines from tank to engine bay (or do they need upgrading to cope with volume flow)
I mount a swirl pot in tank (1litre big enough)
Then gravity feed from swirl pot to 044. Using a min 12 iD high pressure line
Same high pressure pipe split to both rails and back to FPR and back to swirl pot.
Then return from swirl pot back to fuel tank? Is there a line already in the FD that i can use?
Thank you for your help you have confirmed which way i want to go

[rx7boy]

Your 90% there

The swirl pot is normally fitted in the rear of the car, either under the car or in the boot.

U can use the exisintg under-car fuel hoses if they are good condition for your power level, if they are showing signs of rust then might be worth replacing with new lines.

while you are doing all the above then it\'s worth relocating your fuel filter at the same time, either just after the pump in the boot or in the engine bay where the fuel lines come up from under the car.

So

Stock fuel pump --> Swirl pot feed ---> 12mm line to Bosch 044 -->fuel filter--> lines under car ---> fuel rails --->Fuel pressure regulator ---> Lines under car--> swirl pot return --->swirl pot overflow--->stock fuel tank

[clive]

This all sounds fine and you will find room to mount the swirl pot on the back rear subframe on last thing though a true 12volt supply to your stock lift pump is a good idea

Put all the advise you have been given and you will have a fuel supply that will take care of much much horsepower :Viking

[Scuba]

Ahhh... Thank you!! That completes the missing link for me!! I got it now. Thank you so much!!
That is so so so straight forward now it has been properly explained to me!!
Clive. Doesn\'t the factory pump already have a 12v feed standard? Or are you saying that its feed is said to be \'12v\' but when actually measured is less?
Thanks once again guys.

[rx7boy]

Ahhh... Thank you!! That completes the missing link for me!! I got it now. Thank you so much!!
That is so so so straight forward now it has been properly explained to me!!
Clive. Doesn\'t the factory pump already have a 12v feed standard? Or are you saying that its feed is said to be \'12v\' but when actually measured is less?
Thanks once again guys.

The stock system uses a resistor during low load/idle to reduce the voltage to 8v, you can remove this simply by bridging two terminals in the fuel pump relay at the front of the car.

As for when the system is in Normal mode, you tend to find the standard wiring has deteriorated which causes a voltage drop by the time it gets to the pump. Best option is to add a new feed for both the standard intank pump and bosch 044 using two separate relays

[Scuba]

Spot on!! Cheers guys.
Think i have seen that diagram before in previous thread actually.
Thanks mate your a star!!
Big power and safe fuel system. Great 1 less thing to worry about!!
Cheers for all your help again.
Could i be a pain and possibly get your number if i have any more questions
Txt me on 07919906161. Thanks