Newbie to site and to the IDI lifestyle

[jeffro]

Hello to everyone,

I am new to the IDI, used to own a few 6.5's but this is a world of difference. I am currently having some issues with the fuel tanks and senders, both sender are rotten and both tanks are rotten. The truck was one of our salters so it has seen better days, its an 89 f250 7.3 . I am planning to run a fuel cell and 90ohm sender but the issue I'm having is trying to figure out where the check valve would be located? I am just curious because I'm going to bypass the mech. pump and run a elec. lift. Are the check valves located in the sending units?

 

[diesel4me2]

welcome to the site.

i'm sure someone with more knowledge than i will be along shortly with an answer. i've never seen them in our system, unless internal in the sending units or the polac valve.

 

[hesutton]

Welcome to OB.

There are no check valves that I know of on the senders or in the system. I don't pretend to know everything about these trucks, but as far as I know, no check valve.

Heath

 

[icanfixall]

There isn't a check valve on any supply lines from the fuel tanks but.... The lift pump has one in it. Now on the return lines there is a check valve on the end in the tanks.. Its kinda like the bilge auto drains in boating. Thats about it...

 

[franklin2]

That's one of the things you have to deal with on these trucks. The fuel system is totally sealed. So as long as no air gets in, the fuel will stay in the system. One little air leak somewhere(it can be small enough so fuel doesn't apparently leak out) and it will let air in and let the fuel drain back to the tank.

It's kind-of like holding your thumb over the end of a drink straw and drawing the straw up out of the drink. So long as your thumb seals the end of the straw, the drink will stay in the straw.

The biggest offenders for air leaks are the o-rings around the top of the injectors.

 

[Chevyboy_0]

I was under the impression the 90 OHM sender is a gm part? but i guess now that i think of it if your running the fuel cell and a new gauge instead of the factory dash mount one you should be fine