Most folks running a separate cell opt for a low pressure carb-style fuel pump. Will an inline do the trick as well? The primary concern is premature burnout since it can not be primed like a typical set-up where an inline runs in conjunction with a stock intank pump. Also, is a pressure regulator a must? TIA.

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+33 cube/- $$$$ mod

"Real men drive opposite lock."

 

Not sure what ya mean by an inline but I assume like a Walbro 255 Inline?

Thing being is the Carb Pressure pumps being used Normally are "Inline" Pumps.

An EFI Pressure Inline pump should work fine. I don't see burnout being an issue so long as the Tank/Pump is situated so that the Pump doesn't have to DRAW the fuel up/out of the tank. My own Custom Cell has fuel getting to the pump soley due to the sump and Gravity.

You need a regulator on the system regardless of fuel system changes. Gotta keep that Fuel Pressure Stable and Metered Baby!

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Kurtis Tamez
LT4-396.com
97 Z28 LT4-396
94 Firehawk LT1-396
Team NW F-Body

 

Kurt,

Yeppers, gonna run the Walbro. So as long as the pump mounts below the cell, it should live a nice long life?

Any recommendations for regulators and where to set actual pressure? The shot will be limited to a conservative 150 HP.

Thanks for the prompt reply!

 

Jim,

You can run anywhere between 5 and 150psi. It comes down to the jetting. What kind if system you planning using a SIngle Nozzle in the Intake tract I assume?

I'd just try using the same Pressure as the OEM fuel System (~43psi I believe?) and use the supplied jets in the system and have at it!

Let me know if ya got anything particular on your mind.

Good luck!

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Kurtis Tamez
LT4-396.com
97 Z28 LT4-396
94 Firehawk LT1-396
Team NW F-Body

 

Yep, just a plain-jane single stage NX in the intake tract.

Speaking of regulators, is a bypass style preferable? Conceivably not at such modest power levels. Hell, maybe a stock regulator will suffice.

Thanks again.



[This message has been edited by Jim S. '95 Z28 (edited July 11, 2002).]

 

This is the same Aeromotive regulator I'm using on my Low Pressure system, but included is a High Pressure spring for EFI Applications:

http://216.242.145.16/products/product.phtml?p=15

There *may* be cheaper alternatives, but at EFI Fuel Pressures, you selection dwindles pretty quickly. I've always liked Aeromotive products anyways. They're so Pretty. My Entire Dedicated fuel system is made up of Aeromotive Components.


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Kurtis Tamez
LT4-396.com
97 Z28 LT4-396
94 Firehawk LT1-396
Team NW F-Body

 

While, I'm not running a serpate cell, I do have a 2nd dedicated fuel system just for the nitrous, so it's the same theory. I'm running 2 bungs in the stock fuel tank. Both sytems are gravity fed to inline pumps. On the nitrous side I'm using an Accel pump ACC-74701 to an Aeromotive regulator AEI-13101 (also running a return line to tank). Fuel lines are 3/8". I've been running the fp at 45psi (bit rich) and a hobbs switch at 43psi. I've been running this setup for a little over a year, and have yet to deactivate the hobbs switch with low fp, even on a 250 2 stage (NX) shot.

Above p/n's are from Summit http://www.summitracing.com/

Most any of the FI inline pumps will keep up with a moderate nitrous system on a dedicated fuel system, but invest in a good regulator though. I tried 2 of the leaky Mallory POS regulators before opting for the Aeromotive (which has worked flawlessly)
I do recommend running a return with FI pressures so you wont deadhead the pump or spike the fp.

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If I'm playin, I'm sprayin

93 Z28 A3 - w/ Jet Hot coated Hooker LT's and true 3" duals
(hiflow cats, cutouts, and Car Chemistry insert mufflers)

 

Hmmmm........still debating between running the Walbro or Holley Blue. If I'm not mistaken, the regulator on the latter is not a bypass style. Is the lack of a bypass less of a concern with low pressure, carb style pumps?

Thanks again for all the help!

 

You can run a Non-Bypass system on a low pressure setup, but I'd still prefer the Bypass Regulator, as you will see less pressure drop when the system is first engaged.

There m,ay be no merit to this as I have no technical info/testing, but on the single Nozzle system like you're doing I'd prefer the Higher pressure. Just seems to me the Fuel could be atomized better, which is extremely important when flowing the fuel through the Dry LTx Intake design. High pressure tune-ups actually have alot of advantages over Low psi anyways. Your actual % of change per psi is less, so if you drop 1 psi of fuel prssure, its a very minor amount in relation to the fuel enrichment. Drop 1% in a low pressure Tune-Up and you could be missing anywhere from 10-20% of the needed fuel .

What cell were you planning on using? The JAZ 1 Gallon?

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Kurtis Tamez
LT4-396.com
97 Z28 LT4-396
94 Firehawk LT1-396
Team NW F-Body

 

Good point, Kurt. Might as well run the Walbro then Plus, atomization advantages of a high PSI set-up is a plus when mixing race fuel flowing through the nozzle with owl **** 91 octane crap the motor burns

Don't have the cell yet, but will most likely opt for the 1 gallon Jazz underhood to keep the plumbing simple

Thanks again!



[This message has been edited by Jim S. '95 Z28 (edited July 12, 2002).]

 

Arn't the Holley and the Walbro the same pump?, Holley being the more expensive.

 

Yes, the intank Holley and Walbro pumps are the same. The Walbro referred to in this thread is the inline unit; the Holley Blue is used on carb applications.