http://store.summitracing.com/partdetail.asp?part=SUM%2DG3134
It's made by Aeromotive, marketed by Summit.

What is the 'life expectancy' of this type of pump? Just over 1000 miles, it's giving up already. It gets way too hot after about 30 minutes of operation. 3/8" pickup tube, 1/2" line to regulator, #10 gauge wire for power supply. I haven't yet emailed Summit, thought I'd get some input from you guys first

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1965 GT coupe, 333ci aluminum headed/solid cammed stroker, four speed, 3.70:1 9"

Tore it all down, it was real tight turning... but the armature & brushes looked great
I sanded them lightly anyway.

Re-assembled, it was still tight. There's shims at either end of the armature, so I took one out, then it spun real free. Put it back in the car, same symptom... getting real hot
Once hot, the fuel pressure drops to 4.5-5 psi. When cold, I've got the regulator set at 7, so it drops a bunch. WTF? Do these things go away that quickly?

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1965 GT coupe, 333ci aluminum headed/solid cammed stroker, four speed, 3.70:1 9"

You want to buy your mechanical pump back? You can't have it,

quote:

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Originally posted by steve'66:
Todd,

You want to buy your mechanical pump back? You can't have it,

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Ha, ha, ha

N266- No, not relayed, but I did check voltage at the pump (at idle) and it was 13.4, with the fan running. A relayed circuit is next though.

I canned the inline filter before the pump, that seemed to help (restrictive). Fuel pressure is still only 5 psi, and the pump is still hotter than I'd like it to be. The electric motor may in fact be on its last breath I'll let it cool completely and see how it does.

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1965 GT coupe, 333ci aluminum headed/solid cammed stroker, four speed, 3.70:1 9"

Imagine shoving with your full might against an immovable wall 100% of the time. (pump pumping at FULL pressure against a static load) Now imagine gently shoving on a crate and moving it across the floor while with a cool breeze is blowing across your back. (return style regulator set to around 7psi... allowing the fuel to circulate, which cools the pump, while only pumping against a 7psi load)

I've run one Mallory 140 with their return-style #4309 regulator for around 12 years as my main fuel supply. It's the old style they haven't made for years with the screw-in bruses in the side of the motor. I've used another newer style unit for the nitrous enrichment for around 8-9 years without a problem.

Return style regulators allow the pump to run MUCH cooler, work MUCH easier, and run MUCH more quietly. Just be sure to have a low sump in your tank with plenty of fuel to keep the pickup covered, or it will get an air-lock, and you'll have to crack a line loose before the regulator to allow the pump to re-prime itself.

Good Luck!

http://cgi.ebay.com/ebaymotors/ws/eBayISAPI.dll?ViewItem&category=42604&item=2422273898

I just get a small fee for listing it. It's not mine, but it is new.

Good Luck!

The regulator I've got has two outlets; couldn't I just plum one as a return? I'm thinking of using the tank drain plug bung for the return line.

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1965 GT coupe, 333ci aluminum headed/solid cammed stroker, four speed, 3.70:1 9"

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1965 GT coupe, 333ci aluminum headed/solid cammed stroker, four speed, 3.70:1 9"

Good Luck!

quote:

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Originally posted by n2oMike:
Personally, I'd probably use a good mechanical pump.

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I'm begining to think the same way. I already had one, sold it to SteveW

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1965 GT coupe, 333ci aluminum headed/solid cammed stroker, four speed, 3.70:1 9"

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1965 GT coupe, 333ci aluminum headed/solid cammed stroker, four speed, 3.70:1 9"

quote:

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Originally posted by V8 Thumper:
I'm begining to think the same way. I already had one, sold it to SteveW

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Now I'm starting to feel bad Todd.
I really think people cause more problems for themselves by over doing the fuel system. Maybe we've just been lucky, but if the car doesn't run out of fuel it's "good". Save the 1/2 inch line for alcohol or 9 second gas cars. We don't need it for gas engines running 10's and slower in the 1/4. Just my opinion

I'd upgrade the fuel system to run n2o also, actually a seperate fuel systen for the nitrous would be best. So, faster than 10 seconds on gas, running alcohol, or running nitrous you should run 1/2" line and use your existing fuel line for the return line.

Otherwise 3/8" line and a Holley Blue or good mechanical, or in our case we run a Holley red at the tank 3/8" line to a mechanical pump at the engine.