Fueling & Injection - F1-C Procharged Camaro Fuel Pressure Dropping

Need some help guys:

Parts being used
Procharged F1-C making around 13psi
80lb injectors
Edelbrock rails
-6 line
Kirban regulator
Dual Aeromotive 340 Stealth pumps
Y-block in tank with all AN fittings

Build thread on car: http://ls1tech.com/forums/forced-induction/1078729-camaro-ss-f1-c-build.html


Problem:
Under wide open throttle fuel pressure drops at 5500 rpms to about 40 psi (car is making 783rwhp through a 4l80 when fuel pressure falls)


Troubleshooting:
When it primes on key on is goes to base fuel pressure which is around 55psi and falls to about 40 psi and holds.

When air compressor is hooked to regulator for boost signal, the fuel pressure can rise all the way to 100psi

Does the car really need more pump? :bang:

http://i210.photobucket.com/albums/bb201/D-1SC_SOM_SS/IMAG0628.jpg

Twin 255 pumps will feed your engine, so I"m not sure why it is dropping with two 340's, other than you have a bad pump or pumps.

Isn't -6 a little small of a supply line too? Being a 6spd car this makes more to the flywheel then mine and I saw a little bit of pressure drop too. I was running the stock feed line with 2 GS-340's and an Aeromotive regulator. I think the fuel demand might just be a little to high for the line?

Twin 255 pumps will feed your engine, so I"m not sure why it is dropping with two 340's, other than you have a bad pump or pumps.

The car originally had twin 255's, but after doing some tests to ensure there are no leaks and that the regulator was functional, it seemed logical that the car was simply out of pump... However, it's still having the same problem... Very doubtful that 2 255's and 2 340's were/are all faulty.

:confused:

Isn't -6 a little small of a supply line too? Being a 6spd car this makes more to the flywheel then mine and I saw a little bit of pressure drop too. I was running the stock feed line with 2 GS-340's and an Aeromotive regulator. I think the fuel demand might just be a little to high for the line?

I agree. Best bet for the future would be -10 an feed and -8 an return.

need pics of what is in the tank.

also did you happen to add a filter after the pumps?

Yes there is an in-line filter mounted under the car.

I'll ask Mike if he can take a picture of the bucket setup.

http://i210.photobucket.com/albums/bb201/D-1SC_SOM_SS/IMAG0674.jpg

http://i210.photobucket.com/albums/bb201/D-1SC_SOM_SS/IMG_4300.jpg

http://i210.photobucket.com/albums/bb201/D-1SC_SOM_SS/IMG_4296.jpg

Ah take out that filter!

How'd you connect those steel braided lines to your pumps?
Are those line submersible? Rubber or teflon lined?

Ah take out that filter!

Think you were right David. Tim had this small filter on the car:

http://www.jegs.com/i/JEGS+Performance+Products/555/15030/10002/-1


How'd you connect those steel braided lines to your pumps?
Are those line submersible? Rubber or teflon lined?


There is braided fuel line in the bucket

Think you were right David. Tim had this small filter on the car:

http://www.jegs.com/i/JEGS+Performance+Products/555/15030/10002/-1





There is braided fuel line in the bucket

I was wondering how you attached the steel braided line to the pumps since the pumps just have the regular nipple on them like the stock pump?
If you had this same problem with the walbro pumps it sounds like there maybe something else common between the setups that changes after use causing the drop in pressure.

Removing the filter is not an appropriate solution....

Replacing it with one that can meet the flow requirements is the best solution.
I recommend a 10micron to properly protect the injectors.
When in doubt go big on the filter... that filter you linked to belongs on a lawn mower.

Removing the filter is not an appropriate solution....

Replacing it with one that can meet the flow requirements is the best solution.
I recommend a 10micron to properly protect the injectors.
When in doubt go big on the filter... that filter you linked to belongs on a lawn mower.

Do you offer anything?

One of the braided lines coming out of the sending unit looks to have a pretty tight radius and looks like it might be kinked a little. Since you have easy access to removing them you might want to try using a 90 degree fitting on the left (lower) hose and a 45 degree fitting on the right (upper) one. If the system will hold 100psi there shouldn't be a leak anywhere, so it must be a restriction.

Removing the filter is not an appropriate solution....


told him to remove the filter to see if it is the restriction

duh to installing the right filter after that

Just replying to what you typed, not what you implied or what was discussed other than above. I figured you knew better, but it cannot be assumed for all those reading this post.

Many so called "experts" do not run filters & rely on the socks to protect the injectors.
I wanted to make it perfectly clear that you need a good inline filter in all circumstances.

Proper fuel filter solved the problem