fire in the hole, but some fuel pump questions

[Belgian1979vette]

hm, I've been stuck once without a spare tire. Not exactly pleasant either.

[Twin_Turbo]

Is the srge tank pressurized? Mount a 5psi cracking 1 way valve on the return of the surge tank. It will bleed off vapor and force feed the pump. In that clip you hear cavitation. The pump is creating bubbles and it probably gets warm to the touch.

Do you have it running full speed all the time? Might want to get a pump controller.


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[mrvette]

Originally Posted by Twin_Turbo

Is the srge tank pressurized? Mount a 5psi cracking 1 way valve on the return of the surge tank. It will bleed off vapor and force feed the pump. In that clip you hear cavitation. The pump is creating bubbles and it probably gets warm to the touch.

Do you have it running full speed all the time? Might want to get a pump controller.


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Back along about '75 or so, I put a CARTER electric pump in the trunk of my '72 Lemans with a Qjet carb, and the pump put out too much pressure, it was forcing the float valve open, and so I did the easy way out....stuck a series resistor in the +12 feed, to drop the voltage/power down and so the pump ran for years that way.....years later I did an inline pressure regulator....with no return line, I just remember the dial was green and chrome.....it worked ok too.....been a while.....

[Belgian1979vette]

Originally Posted by Twin_Turbo

Is the srge tank pressurized? Mount a 5psi cracking 1 way valve on the return of the surge tank. It will bleed off vapor and force feed the pump. In that clip you hear cavitation. The pump is creating bubbles and it probably gets warm to the touch.

Do you have it running full speed all the time? Might want to get a pump controller.


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A Holley HP125 pump is feeding the surge tank. It uses the stock feed and return. Since the return is smaller I assume it creates some pressure. I left it like that as it will help feed the high pressure pump. I can see a good stream in the tank so that should work.

If air is in the system, it can only be up on top in the tank, but the fittings are almost as high as the roof of he surge tank, so any air should get pushed out to the fuel tank if you ask me.

The A1000 is lower than the surge tank, so it should have no issues with cavitation as it's gravity fed by it.

No, I don't have a pump controller, so it runs full power.

I was thinking going to a Holley 12-1400. I heard comments saying they are pretty much silent. For the price of a controller I have the Holley pump.

[Twin_Turbo]

I swapped my A1000 stuff for a billet holley pump and filters also, mine is an 800 HPish pump, it works just fine. All issues gone after swapping

My surge tank setup:



holley pump setup

[Belgian1979vette]

Is it silent ?

Well, you have at least the luxury of room. The holley is a little wider than the A1000 and gets closer to my header.

[Twin_Turbo]

A lot quieter than the a1000.

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[Grampy]

Hey TT what 5 psi backpressure valve do you use? I'd like to build a little back pressure in my surge tank. The tank is not readily accessable (PIA to get to)so I'd like to use a proven piece. Do you have a maker and part#?

Thanks,

Grampy

[Twin_Turbo]

Kinsler has a special burp valve. Contact them.

[Belgian1979vette]

If the return line is smaller than the feed line, inevitably it will build some pressure. Starting the low pressure feed pump on mine, I can see the needle move some on the fuel pressure regulator, so it does provide pressure.