Botched Edelbrock 1407 rebuild?

[Geff McCarthy]

Beause of loss of power, I disassembled and put in all new gaskets, etc. I did find a lot of rubber debris on the tiny filter screen. Problem is, when i re installed it, fuel does not find its way to the float chambers. My pressure gauge is high, and when loosened, the fuel inlet squirts fuel out. I can see the filter screen intact. So...what is the most common error that an amateur makes on reassembly, please!!

 

[Sam69sat]

Sounds like the needles & seats might be stuck. Did you adjust the floats?

 

[Geoff 2]

N/seats could be jamming in the closed position. So no fuel will enter the carb. Remove carb top. Hold up & watch floats drop down. Needles should drop with floats. If not they are binding.
Unless the n/seats are severely worn, I do not use them in current o'haul kits. Don't trust them.

 

[Geff McCarthy]

Thanks o ypu both. Yes I adjusted the floats to the Ed specs. I backed out the idle jets on the exterior to allow the pointed cut-offs that mate to the float, to drop down. Will try that again and if not, take off the top....ugh

 

[dvw]

The baffel plate that sets in the bowl may be backwards. If so it will jam the float. It may bend the float and the plate. They can be straightened.
Doug

 

[1967coronet]

The screen did its job on the seats.
All that black rubber is from a hose on the carb side of your inline fuel filter.
You need a new section of hose, I would stick a new inline filter on the line also.
Check what dvw told you.
Also check that you do not have any sharp edges on your hard lines and fuel inlet.

 

[Geoff 2]

Post#4. You have lost me. The idle jets on the exterior....I presume you mean the idle mixture screws. What do you mean mate to the float?

 

[Geff McCarthy]

Confusing I agree. The float rises, and via a lever, pushes down on the pistons to shut off fuel flow. I think the pistons may be jammed. I will check again the orientaion of the baffle plates; i had them backwards originally, and the top would not mate with the bottom of the carb!

 

[Darter6]

Sounds like the needles & seats might be stuck.

I had the same problem. The rebuild kit brass needle and seat (both)had a hunk of thin brass blocking flow.
Must have been from the machining of the seat. Quality of parts now a days. Just a thought.

 

[AR67GTX]

Confusing I agree. The float rises, and via a lever, pushes down on the pistons to shut off fuel flow. I think the pistons may be jammed. I will check again the orientaion of the baffle plates; i had them backwards originally, and the top would not mate with the bottom of the carb!

Actually the float rises with inflowing fuel, pushing the needle up into seat, shutting fuel flow off. Did you check the float height and float drop and adjust as necessary?

Also, did you install these little springs on the float/needle?

Those springs are meant to fit pretty loose on the float. If fit too tightly on the float they cause the needle to bind in the seat as the needle has to travel straight up/down while the float swings in an arc. I adjust the springs to where they slightly dislodge the needle from the seat when the float is at its specified drop. That insures the fully dropped float can pull down on the needle to dislodge it in case it has stuck. Although those brass floats are pretty light so they can only provide so much force, less than the fuel pressure I’m sure.

I learned these springs had to fit loose when my needles would bind and not close, resulting in flooding. I had bent the springs so they rode on the float lever pretty tightly - bad mistake. You seem to be having an opposite issue - can’t get the needles to drop. I don’t know if the springs could cause that or not. But something to be aware of.