I was searching around and came across Emery's in-tank fuel pump presentation. For fun I googled the Airtex E3902 in-tank fuel pump kit which Emery stated he paid $68.99 for (written in 2010).

They come up as $19.99 at Summit. At that price anyone wanting to go this way or need a spare should grab one or two!

https://www.summitracing.com/int/parts/atx-e3902/overview/

Vadim,

You probably don't want to do that. The filler tubes enter the Aux. and
Main tanks at a level which leaves about 6 gallons in the non-selected
tank. That is, if you run on the Main until the engine dies, you can
switch to the Aux. and have about 6 gallons of reserve. Or vice-versa.
That reserve can be lower, due to "sloshing" and steep terrain, but you
should always have some reserve. With a pump on only one tank, you'd never
be able to access that reserve.

A MUCH better idea, IMHO, is to remove the selector valve (which is prone
to failure under ethanol attack) and install a pump for each tank. Select
the pump with a relay operated by the disconnected selector valve wire.
Now you not only have access to all fuel, but redundant pumps as well.

I DO like your idea of connecting the return to the Aux. tank. That's what
I do. Since I try to always run on Main, I KNOW that I've got reserve in
the Aux. My return is into the drain plug with a guard for that pipe
bolted to the just-forward crossmember.


Ken H.
Americus, GA
'76 X-Birchaven w/Cad500/Howell EFI & EBL,
Manny Brakes & 1-Ton, Troy-Bilt APU, etc., etc., etc.
www.gmcwipersetc.com

Vadim,
You need to not hesitate to ask me for diagrams for your coach so you get a
better picker and ask. Me for information.
I only need to know what info you need,not your private info, so do
Not hesitate to call.
I have 2-3 people taking care of orders so I can help

On Sun, Sep 30, 2018 at 1:52 PM Jim Kanomata wrote:

> My experience with pressure regulators has caused me to use a low pressure
> pump when needed and not mess with regulators unless your willing to pay $
> 120 or more
> Most of you are expecting high reliability from inexpensive ones, not
> major brands.
>
> On Sat, Sep 29, 2018 at 6:24 PM Vadim Jitkov
> wrote:
>
>> Ken Henderson wrote on Sat, 29 September 2018 16:26
>>> Vadim,
>>>
>>> You probably don't want to do that. The filler tubes enter the Aux. and
>>> Main tanks at a level which leaves about 6 gallons in the non-selected
>>> tank. That is, if you run on the Main until the engine dies, you can
>>> switch to the Aux. and have about 6 gallons of reserve. Or vice-versa.
>>> That reserve can be lower, due to "sloshing" and steep terrain, but you
>>> should always have some reserve. With a pump on only one tank, you'd
>> never
>>> be able to access that reserve.
>>>
>>> A MUCH better idea, IMHO, is to remove the selector valve (which is
>> prone
>>> to failure under ethanol attack) and install a pump for each tank.
>> Select
>>> the pump with a relay operated by the disconnected selector valve wire.
>>> Now you not only have access to all fuel, but redundant pumps as well.
>>>
>>> I DO like your idea of connecting the return to the Aux. tank. That's
>> what
>>> I do. Since I try to always run on Main, I KNOW that I've got reserve
>> in
>>> the Aux. My return is into the drain plug with a guard for that pipe
>>> bolted to the just-forward crossmember.
>>>
>>>
>>> Ken H.
>>> Americus, GA
>>> '76 X-Birchaven w/Cad500/Howell EFI & EBL,
>>> Manny Brakes & 1-Ton, Troy-Bilt APU, etc., etc., etc.
>>> www.gmcwipersetc.com
>>
>> With the filler hoses entering tanks as you describe, it makes more sense
>> now. I was under impression that the AUX tanks just sits a little lower and
>> that's what leaves some fuel there when main tank runs dry. Thanks for
>> the explanation.
>> --
>> Vadim Jitkov
>> '76 Glenbrook 26'
>> Pullman, WA
>>
>> _______________________________________________
>> GMCnet mailing list
>> Unsubscribe or Change List Options:
>> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
>>
> --
> Jim Kanomata
> Applied/GMC, Newark,CA
> jimk@appliedairfilters.com
> http://www.appliedgmc.com
> 1-800-752-7502
>
--
Jim Kanomata
Applied/GMC, Newark,CA
jimk@appliedairfilters.com
http://www.appliedgmc.com
1-800-752-7502
_______________________________________________
GMCnet mailing list
Unsubscribe or Change List Options:
http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org

Wackster,
I am using the fuel pump that came with the Howell EFI kit which I bought in late 2009. Howell EFI was the way to go back then, but it was found that just previous to my purchase, Holley started supply their TBI units with ~60pph (pounds per hour) injectors instead of 80pph. This caused alot of issues for those who got the smaller injectors.

I now have a Rochester TBI with 90pph injectors from a 454 engine. I've also changed the ECM to a DynamicEFI.com EBL unit and very happy with the results.

Note that EFI makes your engine run like a modern engine, but spark control is what wakes the engine up and gives it better performance. Things like lean cruise and deceleration fuel cut-off contribute to better fuel efficiency.

Just my experience