got some fuel questions

[crzybil87]

i was look at the airdog systems , a bit pricey but i figured itd be worth it
question: how would i switch tanks if i used the airdog type system

 

[Fellro]

It all depends how crazy you want to get with this thing. Changing to a P pump requires a lot of messing around changing things, (timing cover, injection lines, injection pump) while the VE will work reliably and produce good streetable performance. I run only a mechanical pump and the VE and we tow heavy regularly. It will run up the mountains in southern West Virginia with no problem at all, pulling a 7000 pound loaded horse trailer, scale weight would push 20,000.

 

[Fellro]

i was look at the airdog systems , a bit pricey but i figured itd be worth it
question: how would i switch tanks if i used the airdog type system

You still would need the pollack valve. The airdog would be just downstream of the pollack, which is what determines which tank gets pulled from as well as returned to. That is why you need a 6 port. two out, 4 in, two per tank.

 

[89PSD]

i was look at the airdog systems , a bit pricey but i figured itd be worth it
question: how would i switch tanks if i used the airdog type system

i posted the answer right before you said the question lol.
you would run it after the tank selector valve. so its only filtering one line.

 

[crzybil87]

yea i didnt see that until i posted my reply and the page loaded again, but how would it know what tank to pull from if i hooked it up after the tank selector, wouldnt it just wanna keep pulling even from the tank that is not selected, haha im having a hard time understanding this

 

[crzybil87]

never mind i just read what Fellro wrote

 

[Fellro]

The pollack valve moves so that you pull and return to the tank it is set to. So when it is set to the front tank, it would pull the fuel from the front tank, then return it to the front tank. That tank gets empty, you switch to the rear, now the valve is set to pull and return to the rear tank. You have two lines from the front tank to the valve, two lines from the rear tank to the valve, and two lines from the valve to the pump. All the pollack does is connect the pump to a tank.

 

[89PSD]

The pollack valve moves so that you pull and return to the tank it is set to. So when it is set to the front tank, it would pull the fuel from the front tank, then return it to the front tank. That tank gets empty, you switch to the rear, now the valve is set to pull and return to the rear tank. You have two lines from the front tank to the valve, two lines from the rear tank to the valve, and two lines from the valve to the pump. All the pollack does is connect the pump to a tank.

but doesnt the truck have one from the factory?... on the frame?

 

[crzybil87]

ok it makes sense now, so i would remove the pumps on the sending units and extend the hose down and send 2 hoses from each tank to the pollock valve and then 2 hoses to the airdog ok i got it now

 

[crzybil87]

is the pollock valve the same as a selector valve?

 

[89PSD]

thats what i thought.

all the aftermarket fuel filter/pump systems ive seen on 97 and under diesels just run it after the selector valve on the frame. And i dont think the fuel cares how its going to be burned.. 7.3 or 5.9....

 

[89PSD]

double post

 

[crzybil87]

if the "pollock valve" is just a selector then i could get one for a diesel ford couldnt i ?

 

[Fellro]

but doesnt the truck have one from the factory?... on the frame?

A gas engine truck does not have a usable selector valve as it is controlled by the pressure from each pump. The pollack is electrically controlled. You would have to go back to carbed or a diesel IDI to get a pollack factory. The later systems like that on my 92 have check valves in the fuel lines. I replaced the complete fuel line assembly on the 92 with a mix between the Dodge fuel system and the IDI lines.

Yes, pollack and selector is essentially the same thing... It is also designed to change which tank the gauge reads, but for your needs, that will not be an issue. the harness and switch already are set up to differentiate between the tanks. On the systems like my 86, the valve changed it, not the switch. The switch only changed the pollack position, which then selected which tank is drawn from, as well as which sender got the signal from the gauge.

 

[Fellro]

if the "pollock valve" is just a selector then i could get one for a diesel ford couldnt i ?

Sure, if you can find one, also at a reasonable cost... Last I priced one, it was pushing towards $200. All that to just keep the Ford connectors... nope, not for me. The universal is around 50, and does the exact same thing, just have to use fuel hose to hook it up. It doesn't have the convenient retainer clip fitting that Ford uses.

 

[crzybil87]

so this pollack is a reliable way of doing this? then I dunno its probly just me but i have a thing about used parts especially stuff of this nature that i have to rely on i dont like doing it that much

 

[crzybil87]

the universal one would work for me seeing as i broke those clips and hose ends last time i did a fuel pump change so using fuel hose isnt a biigy for me

 

[89PSD]

ah thank makes sence

 

[crzybil87]

this is making alot of sense now

 

[crzybil87]

so where could i get a pollack ?