2003 and older models-

Anyone know what size in-tank fuel pump the factory truck lines and return system will support? I'm assuming the walbro 255 in-tank would workfine, but what about anything larger? I'm assuming at some point, the stock return lines will get backed up and fuel pressure will rise above 60psi.

 

aren't you using the GSS340?

my bad

the above is what comes with the radix kit 04 and up

 

The gss340 is the walbro 255 liter pump. The 03s use an in-line version with the radix kit. I want to do an intank upgrade to make sure I get the most pressure and flow I can.

 

have you seen my pump, it is from racetronics and is 2 gss340m pumps in the tank. i am going to say 700+rwhp on stock lines and it is truely plug and play.

one major issue though. i have sucked air under a very hard launch at as much as 3/8 of a tank. my new rule is no beating on the truck at anything under 1/2 tank.

check it out on my site if you haven't seen it. i put up lots of pic's.

 

Here's one for ya

http://www.blackls1ta.com/dual_pumps_mod.htm

 

Jim, I remember when you got yours, but I assumed you had to replace your lines to get enough fuel to and from the rails. So you still have the stock main and return line in the truck?

 

looks like a mangled mess!! dont they make like a huge single intank pump that would pump just as good as two.

i hate this, all the stuff you have to do when you want more power. i wish i knew how to wire things and just be able to do it myself.

 

yep, stock lines and rails still. all i did was put in their twin pump. it is a prety small feed line but so far soo good.

 

Cool. Any clue how much fuel they feed? I wonder if a single bosch 420 will work.

 

not really sure. i think the twin set up would be better. if the 420 will flow as much fuel as twin 340m's then you will have a return line problem and too much fuel presure at idle. my set up works because the 2nd pump is staged. comes up at 4psi of boost.