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[GMCnet] Air Teck E8094 fuel pump. Check valve or not. [message #322428]

Sun, 20 August 2017 17:42

BobDunahugh

Messages: 2465
Registered: October 2010
Location: Cedar Rapids, IA

Karma: 11

Senior Member

Do I need a check valve with my 2 pump EFI set up? I've heard yes/no. Bob Dunahugh
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Re: [GMCnet] Air Teck E8094 fuel pump. Check valve or not. [message #322430 is a reply to message #322428]

Sun, 20 August 2017 17:52

emerystora

Messages: 4442
Registered: January 2004

Karma: 13

Senior Member

If you are eliminating your selector valve you definitely cannot have back flow through a pump.
When I did my in-tank fuel pumps I used two Airtex E3902 pumps.
I checked to see if they had a built in check valve by hooking up an air compressor to pump air backwards though the pump. I got up to 70 psi with no air going trough the pump. I stopped and didn’t try a higher pressure as there was no need to.
They have been in for several years now without using an external check valve and all works fine.

Why don’t you try air pressure back through the pumps you propose using. You can quickly find out if they have a built in check valve. If not, then you’ll have to use external check valves.

Emery Stora

> On Aug 20, 2017, at 4:42 PM, Bob Dunahugh wrote:
>
> Do I need a check valve with my 2 pump EFI set up? I've heard yes/no. Bob Dunahugh
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Re: [GMCnet] Air Teck E8094 fuel pump. Check valve or not. [message #322432 is a reply to message #322428]

Sun, 20 August 2017 18:00

jimk

Messages: 6734
Registered: July 2006
Location: Belmont, CA

Karma: 9

Senior Member

Bob, If your using one as a booster pump, you might want to put in a bypass
valve as these pumps are vain driven, as one might not want to run it all
the time.
For no vain driven one no.

On Sun, Aug 20, 2017 at 3:42 PM, Bob Dunahugh wrote:

> Do I need a check valve with my 2 pump EFI set up? I've heard yes/no. Bob
> Dunahugh
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> Unsubscribe or Change List Options:
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--
Jim Kanomata
Applied/GMC, Newark,CA
jimk@appliedairfilters.com
http://www.appliedgmc.com
1-800-752-7502
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Jim Kanomata
Applied/GMC
jimk@appliedairfilters.com
www.appliedgmc.com
1-800-752-7502

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Re: [GMCnet] Air Teck E8094 fuel pump. Check valve or not. [message #322439 is a reply to message #322428]

Sun, 20 August 2017 21:45

BobDunahugh

Messages: 2465
Registered: October 2010
Location: Cedar Rapids, IA

Karma: 11

Senior Member

I put my vacuum pump on the E8094 fuel pump. Flowed in direction of flow. Could pull 25 in. Hg against flow. And held that vacuum. It's a turbine type pump. So it has to have a check valve. RIGHT? Bob Dunahugh

Do I need a check valve with my 2 pump EFI set up? I've heard yes/no. Bob Dunahugh
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Re: [GMCnet] Air Teck E8094 fuel pump. Check valve or not. [message #322444 is a reply to message #322428]

Mon, 21 August 2017 07:46

jhbridges

Messages: 8412
Registered: May 2011
Location: Braselton ga

Karma: -74

Senior Member

Type doesn't matter in this instance - if it holds 5" MAP (25" vacuum) it isn't going to backflow.

--johnny

Foolish Carriage, 76 26' Eleganza(?) with beaucoup mods and add - ons. Braselton, Ga. I forgive them all, save those who hurt the dogs. They must answer to me in hell

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