| pump setup ... I posted some pics of my install some time ago La-Z-Link .. I decided to run two separate lines ..well ASH did the install so it was his recommendation .. but him and I had some healthy discussion on if we should have "T" the fuel pumps together and ran one line instead of two lines from the pump ....
... I came across a thread on another forum that was an interesting read ...
Figured with some of the high rwhp Z's being put together that others would get some benefit from this ...
***********Disclaimer - the content below is not my work or my opinoin ***********************************
, so I was just sitting at home relaxing, since Sunday is my day off. Somehow i always get suckered into going back to the shop on my days off. I was so curious with how the pumps flowed with different lines and if the 2 pumps actually fight eachother when they are switched on,that i couldnt take it anymore and went to work. This is not a high tech/precision measuring system or anything but it gets close results. You will see what i am talking about when you see the pics.
First, I am going to list all the conversion and measurements along with flow ratings of the walbro 255lph pumps.
Walbro GSS-342 High Pressure 255LPH Tested at 12.5 volts
Tested at 12.5 volts PSI.........Amps..........Liters/hr
43..........7.5..............233.4
58...........9................210.10
73...........11..............189.3 Tested at 14 volts PSI.........Amps..........Liters/hr
43..........7.5..............264.4
58...........9................242.9
73...........11..............220.3 ** these numbers were taken off another site. I did not do this test.
Good things to know
-There are 3.79 liters in a Gallon - (1) Gallon of gasoline weighs approximently 6lbs - There are 16 ounces in a lbs Ok lets go...! The test that I ran I used 0 psi ( i had no time to make a system to test against pressure), as you can see from the flow chart above, as pressure increases the volume decreases. Here is the test that i did. Here is the test equipment I used.. 
I weighed all my containers before they were filled up with gasoline and then weighted them after with 4 gallons in each. Container................Empty weight............. With 4 gallons of gasoline inside Blue fuel container........2lbs 8oz...................26lbs 8 oz.
Brown tubaware...........3lbs 8oz....................27lbs 10oz. Pretty darn close to that 6lbs of weight per gallon of fuel configurations eh? By the way i didnt make that up. I researched and it seems alot of people agreed that 1 gallon of gasoline at 60 degree room temp weighs 6lbs.
Next, I hooked the battery up to my truck with a jumper cable and kept the truck running so that we have consistant voltage at all times. The voltage were consistant between 14.3-14.2 volts at all times
Heres the little bad boy ready for testing, I am going to be testing with our stock fuel line kit and then with the -10 AN stainless kit 
Here he is inside the tank 
First test I am going to run a 5/16 fuel line from the Full Blown Twin Pump to the bucket that i will be measuring with my scale, and timed with a stop watch. I started timing as soon as I see the first sign of fuel coming out the line. Here is the results of the FBM Twin Pump with just a single pump on for 1 min 
Now here is the results with both pump kicked on for 1 min 
Well, you guys are probally like DUH!! two pumps mean double the volume. This just proved that no they are not fighting eachother. Atleast not at 0psi of pressure. Please pay attention it could change later
Ok, now off to the -10 stainless kit. Oh by the way, both of the lines were cut to 3 feet long to keep it fair, plus i made sure that non of the lines were resting on the bucket that was being weighed.
Here is the FBM Pump with the -10 Stainless kit 
Ok Now on to the results for the -10 stainless with a single pump turned on, same as the test with the single pump 
Finally we have the test with both pumps on with the -10 kit 
So with the both pumps on, the -10 kit flows about 1 extra lb of fuel then the setup that has the stock lines configured. Lets break it down 1 gallon of fuel = 6 lbs The Duo pump with the -10 flowed 18lbs per minute. 18 lbs x 60mins = 1080lbs per hour There are 3.79 liters in a gallon 1080lbs / 6 = 180 gallons 180 gallons x 3.79 literes = 682.2 LPH If we plug 17 into the equation instead of 18 for the stock line. We get 644.3 LPH **** you guys may say man these numbers are outragous, but remember the test was done without pressure applied. I will test it againest pressure one of these days, but this took me all day to do. haha So the results are... -With a single pump on with the stock line or the -10 the results are the same. - With both pumps on the the -10 flowed 37.9LPH more then the stock line kit. And remeber this test is not super accurate but its good enough. Plus all the test were done with 0 pressure. Some of you are probally saying, Hell 37.9LPH is not that much of a difference but look below
Here is a pic of the -10 with both pumps on, ahhhh.... its almost like someone is pouring you a nice cup of tea
Now the stock line unit, Holy cow its like a fricken horse pissing in your cup of tea!!! I actually got some fuel that bounce off the surface and hit my face cause i wasnt aware of the pressure 
Conclusion, both pumps are not fighting eachother in the test. Also I think the stock line will work just as well as the -10 setup. But i dont know if it can compare to the -10 as pressure increases. Im sure you can make tons of power off the stock lines but e85 requires about 30% more volume then gasoline does and those stock lines might not cut it. This setup will work in any way you want it. We offer them in both configurations. Stock lines or -10. You can use it with any type of fuel you like, c16, e85, pump gas, anything you like. If I am wrong with any of the info, please correct me. I just did the test and computed some numbers. I am not claiming that i am right but this is just my opinion based on a test **********************************************
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for those who have or plan to do a dual walbro fuel - 
