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Old 06-02-2006, 02:17 PM
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Helper electric fuel pump to aid my mechanical??

Hello all,

I have a fuel system question. I am running a nitrous 406 SBC with a 750 holley. Using a Edelbrock street mechanical pump, internally regulated rated at 130 gph (at what PSI, I don't know). Edelbrock states that the pump is good for approximately 550 HP. My motor is about 457-500HP, plus the nitrous is currently a 125 HP shot. I think I am probably running in the danger zone - and I really don't want to run out of fuel.

What can I do (economically) to help my situation out?

Dedicated nitrous fuel system? (I found a 190 lph Walbro pump on eBay that I might get cheap - also have a regulator that I think will work). Then it seems I will have to worry about using the nitrous regularly to avoid stale gas.

What if I hooked the 190 lph Walbro pump in the feed line to the Edelbrock mechanical pump? Will that work? Will it just help the mechanical, or will it slow the whole deal down?

I sure would appreciate someone's insight on this!! I am getting ready to up my nitrous to a 175 HP shot - wanna make sure the fuel system is up to the task.

Thanks for any help!

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Old 06-02-2006, 02:42 PM
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I think the 190 walbro is a high pressure efi pump. Not a good choice for N20 which needs around 7 psi.

A 125 shot is very small and will not need much fuel volume. I would recommend a small, electric, low pressure pump (7 psi) like a Mallory Comp70 to feed only the N20 system. A dedicated fuel pump for the N20 system, as you have already considered.

I used a similar setup with my 175 hp shot but took it a step further and also used a dedicated, 1 gallon fuel cell for the N20 enrichment. And filled the N20 fuel cell with 110 octane as a little extra detonation prevention. I mounted the small fuel cell in the front of the car. One gallon of fuel would last for about 6 or 7 trips down the 1/4 mile track.
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Old 06-06-2006, 10:49 AM
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thanks for the info!
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Old 06-06-2006, 12:09 PM
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That walbro pump seems to be rated in litres per hour, which is only 50 gph. Just in case you missed it.
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Old 06-06-2006, 07:39 PM
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Do not "T" off your exsisting fuel line, this is a serious no-no, a holley blue pump 110 GPH is enough for 125-150 shot, and yes 7 psi to the fuel selanoid FLOWING.. I dead head the pump to the fuel selanoid, I only turn it on when im about to spray, and turn it off when im finished.. those el cheap o small pumps are not adequate...


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