fuel problem??

[cavfiredesire]

Ok so i just got a 84 carberated blazer with a 2.8 v6. Now i rebuilt the carb, did a electric fan and all that got rid of the smog system. But it seems like i go through way to much gas..on the highway babying it i get about 18mpg...apparently im suposed to get 25 mpgor so. After some more looking and searching i seen that what they did was when the old engine blew they used a engine out of a tb engine so they changed it over to a electric fuel pump and capped off the return line. Could this be my problem? if so how do i fix it? I also seem to have a problem with deisiling when i shut it off so obviously there is excess fuel in the cylinders...it seems sluggish till higher rpms..very gutless to be honest...any help would be awsome..phil

[IsaacHayes]

It could be since fuel injection is usually higher pressure, but TB injection isn't as high as say SFI/etc.

Does sound like you are running rich.

[cavfiredesire]

Yah..well see im carbed tho..thats the issue..i know it needs very low pressure but i havent been able to find the recomended carb fuel pressure..also ith the return fuel line not hooked up i dont know if that is an issue (not sure on the workings of it). I was thinking if i could find the recomende fuesl pressure and then measure mine and see where i stand i could always regulate it down to a better level..now where to find mechanical fuel pump pressures!