At what pressure and where did you get this information?
The 1994 F-series fuel pumps (F4TU-9350-A1A) are rated at 125 LPH @ 310 KPA.
310 KPA = 45 PSI

It says this right on the stock pump.

 

Subford if your looking at some sort of replacement guide then yes you are correct. I went out to my garage and grabbed the pump I replaced with the 190 lt and my numbers on this pump I removed from my fuel canister is as follows Walbro - F3TU 9350 A2A other numbers on the pump AOF213 - 27993-2B - Pat No. 4500270
I have placed a call to Walbro to get the specs for this pump to post on here for information purpose, because if you try to google it does not come up, but I remember when I did the replacement that I was told it was in fact a 77lt per hour pump. If you find specs on this number please post.

 

I removed the FDM (fuel canister ) from a 1995 F150 myself, removed the pump from the FDM and it says right on it the information I posted above.
Namely:
F4TU-9350-A1A 125 LPH @ 310 KPA.

NO I am not looking at a replacement guide. It has a 1994 part number on it as you can see.
I do not think the engraving on the pump would come out very well in a photo or would post it.

The pump you took out dose not say what it puts out on it?
Sounds like someone told you wrong that it put out 77lt per hour.

 

The in-tank mounted fuel delivery module containing the fuel pump is capable of supplying 105 liters (27.7 gallons) of fuel per hour at a working pressure of 270.0 kPa (39 psi) for the 5.0L, 5.8L and 7.5L MFI engines. This info is from my Ford Technical Service Publication on CD.
I also removed my FDM myself and when I opened it the Walbro Pump has F3TU 9350 A2A which is an OEM number(Ford) along with the TI number AOF213(Walbro) etched on the outside, no other info on pump except 27993-2B and below this Pat No 4500270.

 

Photos of the pump I took out:
http://i54.photobucket.com/albums/g9...03489small.jpg
http://i54.photobucket.com/albums/g9...03491small.jpg
http://i54.photobucket.com/albums/g9...03490small.jpg

I would have to say your CD is wrong then.

 

The numbers that Kidd listed are identical to those in the 96 Ford service manual.

That does not mean that the 125 LPH rating is wrong. Walbro uses a "gerotor" type pump which has a considerable amount of internal leakage with low viscosity fluids. The leakage increases with discharge pressure. The 96 service manual lists the following throughputs for the stock pump:

105 LPH @ 39 PSI for the 5.0/5.8/7.5
95 LPH @ 55 PSI for the 4.9 (I was in error earlier using 58 PSI, but close enough)

It is entirely conceivable that the same pump would deliver the nominal 125 LPH rating at a zero discharge pressure. Either way it's a very long way from 77 LPH (which would only support about 220 HP.)

 

Yes that is what my 1995 Shop manual says also but it also says "capable of supplying".
So this would mean the pump can supply that or more. Pump says 125 LPH @ 45 PSI so it would be capable of supplying what the shop manual says.

Here is what it says:
The in-tank mounted fuel delivery module containing the fuel pump is capable of supplying 105 liters (27.7 gallons) of fuel per hour at a working pressure of 270.0 kPa (39 psi) for the 5.0L, 5.8L and 7.5L MFI engines. The fuel delivery module can supply 90 liters (23.7 gallons) per hour at 380 kPa (55 psi) for the 4.9L MFI engine. The fuel pump has an internal pressure relief valve to provide over-pressure protection in the event the fuel flow becomes restricted. Over-pressure is restricted to 850 kPa (123 psi) and reduced fuel flow will result. The system pressure is controlled by a fuel pressure regulator (9C968) on the engine.

 

I guess we shall agree to disagree, no harm intended.

 

Wouldn't the more expensive option but safer in the long run option be to install 255lph pumps in the tanks?


.

 

I installed the a recal disc 12:1 from Vortech and reset my fuel pressure to 42 psi vac off ....and at WOT under 6 lbs of boost I'm seeing 80 psi F/P (Much better ) on the electric gauge. And the AEM A/F guage is now showng a solid 10.5
At least I'm not in the scary lean zone.
I bet ya the 10:1 is gonna be right on the money.

I also installed the 2 pump trick kit. I'm sure that helped with the fuel volume.

Thanks guys.

 

80 PSI!!!
On a a 42# injector vs. 8 lbs of boost that's something on the order of:

((80-8)/39)^.5 x 42 = 57# per injector.

At a 90% duty cycle and .55 BSFC you're looking at enough fuel to support:

8 x 57 x .9 / .55 = 747HP

And for a pump to supply the whole mess at max throughput with 10% reserve you'd need

(57 x 8) / (6.25 x .9) = 81 GPH or 307 LPH.

Your present system with the 2 pump trick supplies 255 LPH or enough for only about:

(255/3.785) x 6.25 x .9 /.55 = 690 HP

I think you're covered

 

Lol. I think I should be good!

If anybody is looking for this 2 pump trick let me know. I got all the info from a Lightning forum www.nloc.net . A guy by the name Struckby makes and sells them for around $ 110