[6T9GTO]

I am interested in using an electric "booster" fuel pump. I have a Cliff's prepared Qjet on my 69 GTO. The car regularly sits for 2-3 weeks at a time and I have to spin the starter a very long time to fill the bowl. Once it cranks up the first time, the car is good to go all day long. Would I have to do a bypass circuit or a check valve to use the electric pump?

Les, do you see any problems with fuel restriction without a bypass at normal cruise. What about WOT while playing around on the street? This car hasn't see the track in 15 years, and probably never will.

Tom, I searched for a previous post about an electric fuel pump bypass, but came up empty.

By the Way, The Cliff's Qjet is the best money I have spent in a long time. Flawless performance!

Thanks, Bill

[goatless]

I'm going to add a pusher pump to my '69 soon too. I'm going to try the Carter Street pump.

You might be looking for this thread?
http://216.178.81.108/forums/showthr...ht=pusher+pump

If you search for "pusher pump" several related threads also come up.

[wheelspin]

The booster pump setup works great, without the bypass, for your application of priming the carb and occassional street/strip performance use. Both pumps are equipped with poppet style valves that yield to pressure, allowing either pump to flow thru the other. Your 69 should have a small fuel return line off the mechanical pump, now that I think about it.

The "valves" do provide some flow restriction, which may be Tom's reason for recommending the bypass. Fuel pressure should be checked and regulated, if necessary. I use a small "Spectre" regulator, avaiable @ Autozone for about $20, to keep the tri-pwr pressure down to 4#.

I have driven the 4450# GP cross-country in July, and ran 14.45 @ 97mph @ 6,000 ft. with this combo pump setup, without fuel supply problems.

Les

[Tom Vaught]

Wheelspin, Did you have both pumps on during your quarter mile runs?

The issue is primarily when you are trying to do a acceleration (when the pump is off) and forget to turn it on or you have to do an emergency acceleration and the second pump might not allow the fuel volume you need, now you have a bIG problem.

I have thought about having a third set-up where you pull through the by-pass to the normal pump but turn on the rear electric pump if you get over a certain rpm. A MSD rpm sensor could easily trigger a relay to turn on the pump that way.

Tom V.

[grandville455]

I Use a carter street mech fed by a carter elec .. its only on at WOT via A Nos snap action Switch from summit set up by the throttle and when its floored it activates the elec pump... other than that it drives on the mech any other time....works perfectly

[wheelspin]

Tom,

I have used it both ways; two pumps and mechanical only, with no detectable performance advantage. Darby's full throttle switch is another performance option, although I don't recommend the dual pump setup for racing due to the above-mentioned flow restrictions.

Les

[tom s]

Tom and Les,I run a pusher elect pump through #8 brade to a Carter street pump,I run 3/8 tube from it to the 2-4 SD carbs.The elect is on the key and always on when the key is on.Dont need a reg,have not run out of fuel going through the traps at 6000.Been in the car for almost 7 years.Was told the Carter mech would regulate the elect and as said have had no problems.FYI,Tom

[6T9GTO]

Thanks for the repsonses, guys. I am going to go with an electric "pusher" with no bypass.
-Bill