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post #1 of 12 (permalink) Old 01-10-2018, 12:42 AM Thread Starter
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Fuel pump upgrade and the OEM canister venturi

I have an AEM 10-1200 pump that I am working on installing into the stock canister.
I notice the canister has a flap value at the bottom of it and the OEM pump has a venturi port that sits over that.

The AEM pump has no provisions for a venturi. In fact I don't think I have ever had to deal with a venturi on an aftermarket pump install. Granted this is my first late model GM.

I know the idea of the venturi is to constantly fill the pump canister from the bottom of the tank and I have no interest in rushing off to the gas stations below a third of a tank. So, has anyone successfully ignored the venturi in an after market pump install? Is there a work around? Thoughts on perforating the bottom of the canister?

Any help or insight would be great.

same thing on the solstice forum if it gets answered there and anyone is looking.
Fuel pump upgrade and the OEM canister venturi - Pontiac Solstice Forum
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Last edited by roust84; 01-10-2018 at 01:07 AM.
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post #2 of 12 (permalink) Old 01-10-2018, 01:52 PM
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I have. At below quarter tank you need to watch your throttle as the pump can get starved for fuel if you floor it and fuel moves away from the pump. However, I have literally ran mine dry with the aftermarket pump and no issues.


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post #3 of 12 (permalink) Old 01-10-2018, 03:01 PM Thread Starter
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Robotech,
Did you remove the flapper? Add any holes to the bottom of the canister?
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post #4 of 12 (permalink) Old 01-10-2018, 03:51 PM
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I did not add any holes to the bottom of the canister. I kept the little rubber flapper in place IIRC.


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post #5 of 12 (permalink) Old 01-10-2018, 05:00 PM
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Could you just swap the venturi plastic bottom from the old to new pumps? (Can't tell from the pics if it would match up or not)

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post #6 of 12 (permalink) Old 01-10-2018, 06:10 PM
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Originally Posted by TomatoSoup View Post
Could you just swap the venturi plastic bottom from the old to new pumps? (Can't tell from the pics if it would match up or not)
Sadly no. The venturi and how it attaches to the pump motor is unique to that pump motor. The new pump just has that "sock" filter on it and no other attachments down below. If there was any way to attach that to the new pump, I would have.

Right now the fuel pickup isn't a problem below a quarter tank when I'm driving on the streets. It only becomes a real issue accelerating HARD up hill. The engine will actually cut out from fuel starvation at that point. So I tend to watch my throttle when the tank is that low and I don't autocross with anything under a quarter tank. Really the issue is closer to an 1/8th of a tank but I like having a little buffer.


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post #7 of 12 (permalink) Old 01-10-2018, 08:02 PM Thread Starter
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Robotech,
I appreciate the insight and words of warning.

Tomato,
As Robotech pointed out, the venturi clips into a port in the stock pump. In the aftermarket pump there is no such provision.

Running into fuel starvation scares the cap out of me. Especially, if say, nitrous was invovled.

I am surprised this hasn't been solved with these cars yet. Especially since there seems to be a lot of boosted lsx swaps going on these day.

Last edited by roust84; 01-10-2018 at 08:07 PM.
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post #8 of 12 (permalink) Old 01-11-2018, 11:11 AM
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Like I said, the issue only happens below a 1/4 tank when going uphill or turning hard AND accelerating hard. If you're going to run the spray, just keep in mind where you are at fuel wise and don't push it hard when your tank has dropped below that 1/4 mark.

I know with some of the boosted LSX guys, I believe some run a fuel cell with a whole different fuel system for flow and for this reason.


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post #9 of 12 (permalink) Old 01-11-2018, 02:03 PM
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Quote:
Originally Posted by TomatoSoup View Post
Could you just swap the venturi plastic bottom from the old to new pumps? (Can't tell from the pics if it would match up or not)
We did a couple fuel pump upgrades early on before we realized that the stock pump would flow plenty of fuel typically. If you still want to proceed with a different fuel pump, what we did was to weld up an aluminum tube that hooked on the output of the new fuel pump that had a "T" on it. Off of that "T" we fed a new fuel hose down along the side of the new fuel pump to the venturi. It was a very tight fit to get it all in there and kinda a pain to do, but it did work great. You probably could find some fuel safe "T"'s out there to do the same thing, we just welded up the one we did so we could fit everything a little nicer for packaging.

Hope that helps,
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post #10 of 12 (permalink) Old 01-11-2018, 03:27 PM
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Originally Posted by [email protected] View Post
We did a couple fuel pump upgrades early on before we realized that the stock pump would flow plenty of fuel typically. If you still want to proceed with a different fuel pump, what we did was to weld up an aluminum tube that hooked on the output of the new fuel pump that had a "T" on it. Off of that "T" we fed a new fuel hose down along the side of the new fuel pump to the venturi. It was a very tight fit to get it all in there and kinda a pain to do, but it did work great. You probably could find some fuel safe "T"'s out there to do the same thing, we just welded up the one we did so we could fit everything a little nicer for packaging.

Hope that helps,
Dave
Interesting. Yea there isn't a lot of room to work with in there....but I like that idea.


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post #11 of 12 (permalink) Old 01-16-2018, 04:28 PM
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As long as I treat my fuel every six months, the stock pump works great.

I don't pay attention to the tank level but to miles to empty (which means walking and hearing my lovely wife tell me I am an idiot). Since it can suck a LOT of fuel through the stock pump and lines, I tend to refuel early and often.

But then I am not boosted either. Just your ordinary garden variety NA.
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post #12 of 12 (permalink) Old 01-16-2018, 05:46 PM
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Yea, a 2.4 NA doesn't really need anything more than the stock pump. No need for it. Even the boosted LNFs only need it if they are making substantial power but their big restriction is usually what the stock injectors can flow. As long as the HPFP is getting enough fuel from the in tank fuel pump, no need to swap it.

Those of us with illusions of glorious boosted 2.4 grandeur really may need to swap out the in tank pump.


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