At what point is it necessary to upgrade your stock fuel pump? Since I'm going to be using 44lb injectors for my 6L build, wouldn't in theory my fuel pressure drop since the injectors will be flowing about 40% more than my stockers? What're the rest of you doing?

 

I always recommend doing the pump swap when someone is doing a build.
Its only a 100.00 pump and takes 45 min to install.

The time to replace the fuel pump is when you start seeing a fluctuation in fuel pressure under load.
You should maintain close to 60PSI WOT.
Id def. recommend a 255 pump with a 6L with supporting mods.

Derek

 

thought the stock pump was techinally good for a little over 500rwhp?

 

In theory your fuel pressure would drop, but you are forgetting about the fuel pressure regulator. I think you will be fine, the stock pump feeds the 8.1s?!?!?

 

If you've got a decent amount of mileage on the stock pump it definitely wouldn't hurt to upgrade. Also, if you plan on nitrous (wet or dry) it's nice to have it already in there so you know you're getting enough pressure at the rails.

 

Well, the truck only has 30K miles on it, the 6L is just a 10.5:1 comp motor with a 220/224 comp cam, 243 heads and long tube headers. No nitrous will be used ever nor do I plan on going FI. Fuel system is an '04 returnless style. I really would prefeer to not have to remove the truck box to replace the pump if it's not needed.

 

Dropping the tank isn't really that bad IMO...

 

The question is whether or not I need to upgrade the pump to get this setup to work. Will the pump supply enough pressure to spray properly out of the injectors or not?

 

Well, if you buy an OEM pump it's more expensive. Just go for the walbro. Also, pulling the bed off isn't bad.

 

Agreed. Doing a build, excessive drop/ variance, high miles. Know future plans/ goals, if possible. Or just take your chanches, & wing it. When it goes, if it does, replace. Never @ the motors' expense. It's a function of $, time, bla bla. If u have to change pump, only a few options. Drop the tank (less fuel the better). Slide bed back enuff for access, maybe.
Also, pulling the bed off isn't bad. You need space for bed, a few friends, & . If I had to guess.