OK, this is my situation. I have a Bosch 044 as my primary fuel pump, being fed from the bottom of the fuel tank. It has been running perfect for a couple of years.

On a dyno pull, it starts going lean at high rpm’s @ 12 psi boost.

I have a 255 Walbro in the fuel tank, (not being used) that I planned on using to help feed fuel from 8 psi on up. My plan was to “T” into the ½ inch fuel line going from the 044 to the injectors.

My question is if the two different pumps will fight each other not being matched on performance. Or if it all sort of even’s itself out?

Or should I replace the Walbro with a Bosch 040 in the tank?

I’m planning on turning up the boost in the future, and need to get the fuel sorted out first……….

 

If I am understanding you correctly, you will be in essence, pumping against eachother unless you could make a y fitting of some type - the T wont give you the results. Get a second warlbro and do dual in-tank 255's... you should be plenty.

 

I think it would be easier to add another Bosch 044 outside the tank since I already have the feed coming off the bottom.

I have not had that much luck with Walbro's.

 

Yea my walbro 255 just crapped out on me after only 6 months. I got the Bosch 044 and about to do the intank setup with it this week.

 

The Bosch 040 is the pump you want for in tank use. The 044 is set up for in line use. Both pumps have the same specs, 300 lph.

Here is a link to Bosch info.......
http://boschfuelpumps.com/

 

Off the subject 95TwinTT thats a sweet set up you have there very very clean.

 

Do some searching,the Bosch doesnt actually flow that much...

A much better option is the stock Supra TT Denso pump.They flow around 285lph

 

Look into a kenne bell boost a pump or magnavolt. That's what lingenfelter and hennessey used in their twin turbo corvettes so they wouldn't have to drop the tank down and change pumps. I'm using a KB BAP for my radix.

 

No disrespect intended, but the Bosch pumps have proven themselves in every category. They especially shine in volume delivery, while being pushed to high pressures. I have run these pumps all the way to 100 psi before with the volume remaining in a linear range of volume. Makes it easier for SD tuning.

I don’t doubt that Lingenfelter is having good results running the stock pumps over voltage, but I would not count on them for a daily driver.

I know there are a lot of pumps on the market, but I would tend to trust German engineering over the Japanese. Just a personal preference over years of experience.

My engine package is designed by Banks to achieve 1050 hp. It is important that the fuel delivery is seemless from putting around in traffic to all the fuel it wants, wide open.

So far I have not taken the boost past 12 psi. That is in the near future after I make sure the fuel deliver is perfected.

Meanwhile it is the daily driver that I depend on.

 

I have done plenty of searching. So your saying a stock Supra fuel pump that pushes AROUND 285 LPH outflows a Bosch 044 thats rated @ 300 LPH. That doesnt make any sence to me. Also considering a Supra isnt a V8 and plus i wouldnt want a pump thats out of a jap car. Sorry