Hello all,
I am new to carb's and am looking for some information on my 86 305 w/ quad jets ( stock ). From what I have read on the forums here it seems likely that its a fuel delivery issue, and my first things is going to be the fuel filter. I am wondering if someone could post a pic of where this is located or give me easy directions on finding it. I have just purchased this car and it had been sitting in a lot for awhile ( they had it tucked away in the back) and am also wondering if seafoaming it might be a good idea, I am partially looking for thoughts on how well seafoam seems to work for you guys as I have not used it ever but I have been told its the perfered method for these cars.

 

Welcome to the thirdgen.org family.

The fuel filter is located in the carb inlet. The fuel line goes to a nut on the carb. The fuel filter is behind that nut. You need to remove the fuel line, which requires holding the nut on the carb before loosing the b-nut on the fuel line. Then, remove the nut from the carb. The filter will be first, which has a spring behind it.

If it bogs when you first floor it, that's probably an air valve issue, such as the choke pull-off not holding the AV closed until vacuum drops like it should, or the AV spring tension is too loose for one reason or another - check out the tech articles linked from the thirdgen.org homepage for one about optimizing your computer controlled q-jet.

 

Thank I will be reading through those now, I picked up a fuel filter and some sea foam, should I seafome first or change the fuel filter first?
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also I just took it out again and realzed then in park it revs with no issues, its only when in gear, could I be looking at tranny issues?

 

Probably not. The AV doesn't open when you rev it in park/neutral, it needs more sustained load to start to open.

When you do Seafoam doesn't matter much. It won't be going through the fuel filter.

 

ok thanks I printed out that list and am going to take a look at it tomorrow after work, I really appreciate the anwsers to my questions. And thanks for the welcome

 

That was it, thank you so much, It was actually stuck enough that I had to use some carb cleaner to get it to even move. Once I reset the tension runs beautiful