hey all just getting my fuel set up happening before tuning and was wondering if i need an in-tank pump(WALBRO 255LHP) to match the 044 externals pumping capabilities ..?? will my surge tank empty if i just fill it off of the standard pump and extract from it with the 044 pump..?? thanks in advance Some original photos have not been recovered yet.

To be safe, yes. The stock intank is only good for 2 lts/min, whereas the 044 will pump 4 lts/min. If the level in the fuel tank is higher than the inlet of the 044, then it may gravity feed through the intank pump OK, but once the tank level drops below about a 1/4 you will have issues.

How would you setup a walbro intank pump. Some original photos have not been recovered yet.

Quote: Originally Posted by MonstaS4 [View Post] To be safe, yes. The stock intank is only good for 2 lts/min, whereas the 044 will pump 4 lts/min. If the level in the fuel tank is higher than the inlet of the 044, then it may gravity feed through the intank pump OK, but once the tank level drops below about a 1/4 you will have issues. But assuming this is going into a street car, in general cruising 3 out of the 4l/min supplied by the pump will return back to the surge tank, essentially supplying it with 5l/min. Assuming you're running 750cc-ish injector size, at maybe 80% duty cycle, full throttle sees 750x6x0.8 l/min usage= 3.6l/min. meaning 0.4l/min goes back to your surge tank. So at full throttle the surge tank sees 2+0.4=2.4l/min going in, and 4l/min going out. Net loss rate is 1.6l/min. This means that a standard 2l surge tank will last 1.25min straight on full throttle before it runs out..very unlikely. i think you should be fine with this setup on a street car, but you're better off going with a larger lift pump just to be on the safe side Some original photos have not been recovered yet.

When installing a different lift pump externally to the tank do people extend the pickup tube & remove the internal pump?

No idea^ One thing I do know,is with the standard in tank pump, feeding a 2+ litre surge tank, and 2x 975 externals, I was getting fuel starvation after about 30 odd seconds at full throttle Bought a walbro internal pump, modified the pipes to suit, and it pretty much bolted inplace of the standard internal pump = fuel issues gooooone

Definitely going to put a higher flowing unit in mine then.

Quote: Originally Posted by OBT100 [View Post] No idea^ One thing I do know,is with the standard in tank pump, feeding a 2+ litre surge tank, and 2x 975 externals, I was getting fuel starvation after about 30 odd seconds at full throttle Bought a walbro internal pump, modified the pipes to suit, and it pretty much bolted inplace of the standard internal pump = fuel issues gooooone bosch rates their 975s as 2.75l/min. So if you're pumping 5.5L/min out of a full 2L surge tank, for it to take 30sec to empty it means it was only getting supplied with 1.5L/min. So either your intank pump was shagged to begin with and wasn't supplying the 2L/min it was supposed to AND you were running your injectors at 100% dutycycle with no return fuel running back to your surge tank, or your surge had a hole in it and was leaking lol.

Look in my car thread guys I've put a walbro intank in place of the factory one, fills a 2litre surge tank then onward to an 044. Its not that difficult to install (keep in mind though that on my car the return line from the fuel rail is NOT the one on the sender unit, my return line goes to a random barb on the fuel tank, about 30cm to the left of the sender unit (and inside the tank its got a hose that feeds it back in to the swirl pot - don't understand why they didnt use the return on the sender unit -nevermind. here's the post from my thread: http://www.calaisturbo.com.au/showpo...1&postcount=51 (http://www.calaisturbo.com.au/showpost.php?p=2524181&postcount=51)

Quote: Originally Posted by madrx3boy [View Post] Look in my car thread guys I've put a walbro intank in place of the factory one, fills a 2litre surge tank then onward to an 044. Its not that difficult to install (keep in mind though that on my car the return line from the fuel rail is NOT the one on the sender unit, my return line goes to a random barb on the fuel tank, about 30cm to the left of the sender unit (and inside the tank its got a hose that feeds it back in to the swirl pot - don't understand why they didnt use the return on the sender unit -nevermind. here's the post from my thread: http://www.calaisturbo.com.au/showpo...1&postcount=51 (http://www.calaisturbo.com.au/showpost.php?p=2524181&postcount=51) the return line isnt meant to connect to the sender unit, that's the feed FROM your lift pump to your external one. The return line is meant to connect to that "random barb" to the left of the sender unit. But i dont quite understand what you mean by hose that feeds to the swirl pot. Your internal pump should have a hose running from the sender unit to the surge tank. then the return from your rail should go back to the surge tank aswell. Then an overflow from your surgetank should be connected to the random barb on the fuel tank..

Yea but seen on the sender unit there's 2 steel pipes. ones for fuel feed, ones for fuel return. but on my sender unit, the return is blocked off, but there is another barb on the fuel tank nearer to the driver's side - which is my car's fuel return. Inside the tank, (if you take the sender unit out), you'll see a plastic swirl-pot where the internal pump sits in (the swirl pot gathers fuel in it to keep enough available to the lift-pump. Because my return barb is in a different spot, Inside my tank there is a hose which runs from my fuel return and feeds into the swirl-pot (whereas I think the return line on the sender unit is the one that's normally supposed to feed into the swirl-pot). So the flow on my system - intank (lift) pump walbro > fills 2L surge tank > feeds 044 pump > feeds fuel rail + injectors > returns to surge tank > any overflow from surge tank returns to main fuel tank.

Quote: Originally Posted by Nukz [View Post] bosch rates their 975s as 2.75l/min. So if you're pumping 5.5L/min out of a full 2L surge tank, for it to take 30sec to empty it means it was only getting supplied with 1.5L/min. So either your intank pump was shagged to begin with and wasn't supplying the 2L/min it was supposed to AND you were running your injectors at 100% dutycycle with no return fuel running back to your surge tank, or your surge had a hole in it and was leaking lol. Just telling it how it is mate, the intank standard pump was new and couldnt keep up, changed to a walbro, and the issues were gone. My setup runs the same as the above post^, just different components

I fitted a surge tank and 044 to My VL on the weekend. The 044 sounds like it is surging (the tone changes over bumps and around corners). I am wondering if this is due to runnning the 044 off the factory wiring, if I have plumbed the surge tank wrong or My lift pump is shagged. In order from top to bottom the hoses on the surge tank run: Back to fuel tank, return from the fuel rail, lift pump. I am planning to re-wire the pump so it isn't relying on the 24 year old wiring to supply full voltage and I'm hoping the 044 isn't a dud. Some original photos have not been recovered yet.

Quote: Originally Posted by OBT100 [View Post] Just telling it how it is mate, the intank standard pump was new and couldnt keep up, changed to a walbro, and the issues were gone. My setup runs the same as the above post^, just different components did you run your return to the surge tank first? and not back to the tank, as explained above.

Quote: Originally Posted by TUXEDO [View Post] I fitted a surge tank and 044 to My VL on the weekend. The 044 sounds like it is surging (the tone changes over bumps and around corners). I am wondering if this is due to runnning the 044 off the factory wiring, if I have plumbed the surge tank wrong or My lift pump is shagged. In order from top to bottom the hoses on the surge tank run: Back to fuel tank, return from the fuel rail, lift pump. I am planning to re-wire the pump so it isn't relying on the 24 year old wiring to supply full voltage and I'm hoping the 044 isn't a dud. Yea your hoses are in the correct order. Be best to use the old wires to switch a relay, and run a power feed from the battery to the relay and then on to the 044's positive terminal, see how that goes before getting a replacement. Some original photos have not been recovered yet.

yeah cool thats the plan. will be doing tomorrow night thanks Some original photos have not been recovered yet.

Try taking out the hose that runs from your intank to your surge tank and put it into an empty container. get constant 12v running to your intank pump temporarily and see how much fuel comes out in 30sec. This will tell you if your intank pump is flowing what it should be . And definately upgrade the gauge of wiring with a relay. An 044 draws between 15-20amps, so get some wire to suit Some original photos have not been recovered yet.

Quote: Originally Posted by Psi_Wagon [View Post] did you run your return to the surge tank first? and not back to the tank, as explained above. So the flow on my system - intank (lift) pump walbro > fills 2L surge tank > feeds 044 pump > feeds fuel rail + injectors > returns to surge tank > any overflow from surge tank returns to main fuel tank. exactly like that

I was looking at carter pumps my setup is 2x 044 pumps & 2.5L surge tank My boss has a 72gp/h brass carter pump I could get for cheap, I was pricing up the 100gp/h carter black. Would it really be worth me spending the extra to get a 100gph pump or will a 72gpm be alright? Do I need a regulator using it as a lift pump? cheers.

So i could just remove the intank pump & replace the intank pump with a walbro. Sounds like a good investment. Some original photos have not been recovered yet.