my new project

[4seasons69]

You can borrow my Aeromotive FPR, if you have the fittings to use it.

Your fuel feed/return stuff is all AN right?


That would be awesome! Yeah its all an stuff. As long as it has -6 inlets and outlet I can use all the fittings from mine

[blackawdtsi]

Could it maybe be a fuel pickup issue too? Clogged filter somewhere?

Also, the numbers you showed on the wally450 seem WAY low, I wouldn't be so sure that the 450 you used was working right.


It's actually right on the nuts.

http://www.maperformance.com/rehost/walbro-400lph-charts_2.jpg

[asshanson]

When you flow tested the pumps, were they out of the tank? What did you use to force the 90psi, your regulator? Why not test the flow with everything in the car, so you are testing your lines, etc.

[Murlo26]

It's actually right on the nuts.

http://www.maperformance.com/rehost/walbro-400lph-charts_2.jpg

I guess I am just surprised it wasn't higher compared to the 255. I honestly didn't even do the math or check the flow ranges that it was supposed to be. I know the wally 450 has WAY more flow in it compared to a 255 so percentage wise it seemed quite a bit lower than I would've thought.

[4seasons69]

When you flow tested the pumps, were they out of the tank? What did you use to force the 90psi, your regulator? Why not test the flow with everything in the car, so you are testing your lines, etc.

The pumps were intank. I just popped my return line off of by my regulator and ran it into a container. We used my regulator to up the pressure to 90psi. So these flow tests were done through the fuel system in my car

[blackawdtsi]

I guess I am just surprised it wasn't higher compared to the 255. I honestly didn't even do the math or check the flow ranges that it was supposed to be. I know the wally 450 has WAY more flow in it compared to a 255 so percentage wise it seemed quite a bit lower than I would've thought.

The test was for max boost. 90psi - 43.5 = 46.5

35psi of boost would've been 78.5psi where there is a giant difference between the 255hp and the 450. The 255 would do about 185 lph and the 450 would do 230ish lph.

The fact that Shawn was only on 35psi and with the obvious difference in flow between 2 255s and 1 255 w/ 1 450, shows that something is restricting the flow or the FPR diaphragm is toast.

[asshanson]

The pumps were intank. I just popped my return line off of by my regulator and ran it into a container. We used my regulator to up the pressure to 90psi. So these flow tests were done through the fuel system in my car

Bizarre. So you really shouldn't have any restrictions or a faulty regulator, because you proved the system will actually flow what it should at 90psi.

Are you sure you're getting full boost pressure in the vacuum line to the regulator? Or maybe the regulator can do a static 90psi but when set to 40ish and then the added boost it can't up the pressure like it should? A good test would be to set the regulator to base pressure, and then use the vacuum line to add the additional 40psi. Just a thought.

[Shane@DBPerformance]

That's a good idea.

[4seasons69]

Bizarre. So you really shouldn't have any restrictions or a faulty regulator, because you proved the system will actually flow what it should at 90psi.

Are you sure you're getting full boost pressure in the vacuum line to the regulator? Or maybe the regulator can do a static 90psi but when set to 40ish and then the added boost it can't up the pressure like it should? A good test would be to set the regulator to base pressure, and then use the vacuum line to add the additional 40psi. Just a thought.

That's a good idea.

That's a really good idea. I'll try that sometime this week

[bramagedained]

You can come pick up the regulator any time. It had pushlok lines, you should be able to unscrew the AN fittings from your regulator and put them on mine.