New carb, idle surge. Need to adjust timing?

[cameronsaddress]

There is no barb or plug there. Only an open hole... And it has almost vacuum as the full vacuum port on right of the carb. Should it have come plugged then?

 

[cameronsaddress]

Just called edlebrock they said the vacuum port is suppose to be there. I guess it's a metered vacuum port? Seems like quite a big leak to be metered though?...

 

[ryoken]

either way, plug it...

 

[cameronsaddress]

Idle seems to be doing good now.

Only problem left is the start of the truck. I have to turn it over for 2 seconds while flooring it to get it to start up. Any idea what this could be? It didn't start till I installed this new carb...

Thanks guys

 

[bigbadchev84]

Its a crappy edelbrock Ditch that thing the first chance you get and get a quadrajet and enjoy better mileage and power.

 

[cameronsaddress]

Damnit... Where we're u guys last week before I dropped bucks

 

[ryoken]

if you had asked, 9 out of 10 of us would have said quad.... next time.....

flooring it means it's flooded..... wont fire unless it's got that much more air via the plate being open...

you may wanna pull a couple plugs and take a peak, sooted will verify that...

 

[K85 Octane]

pics of the "metered vac port" please

 

[cameronsaddress]

vac port pic:

 

[cameronsaddress]

just replaced the plugs a few days ago, so they should look brand new.

If its flooded, is that something that I need to configure on the carb?

What quad jet would you have recommended? Maybe I can get summit to take it back since its been such a headache....

 

[ryoken]

how did the plugs look?

 

[cameronsaddress]

havent checked the plugs since installing the new carb because they were a couple of days old when installing the new carb. Should they be discolored after only a couple of weeks of flooding?

Could my float level in the carb be causing the flooding issue? ...or maybe my choke is still not setup correctly?

 

[ryoken]

yup, it's actually easier to read a prob sometimes when they are very fresh....

and yes, either of those could be causing an issue.. float will cause it to come out the overflow, into the motor.. and the choke for obvious reasons...

stage 2 Jet's seem to be a good popular buy these days in quads... Summit carries them...

 

[K85 Octane]

and the float could be flooding because of the fuel pressure, among having it set wrong

 

[ashman]

and the float could be flooding because of the fuel pressure, among having it set wrong

fuel pressure is a good point. you don't happen to have an electric fuel pump do you?

my buddy has one installed on his land cruiser and he had to install an adjustable pressure regulator because it would keep flooding out the carb.

 

[cameronsaddress]

just replaced the mechanical fuel pump last month:

http://www.autozone.com/autozone/pa...N-iplb3Z8vcz2?itemIdentifier=195156_199148_0_

Airtex Master/Fuel Pump
For your 1972 Chevrolet Truck Blazer 4WD 5.7L 4BL OHV 8cyl

Part Number: 40987
Weight: 1.45 lbs
Warranty: 1 YR
Notes: Mechanical pump.
Gaskets Included: Yes
Inlet Attachment: Tube
Inlet Count: 1
Inlet Size (In): 3/8
Performance Item: OEM Standard Part
Maximum Free Flow Rate (gph): 40
Maximum Pressure Range (psi): 9
Minimum Free Flow Rate (gph): 40
Minimum Pressure Range (psi): 7.5
Outlet Attachment: Threaded
Outlet Count: 1
Outlet Size: 5/8-18 UNF-2B I.F.
Package Contents: Mechanical Fuel Pump
Package Quantity: 1
Shipping Information: Overnight and Two Day shipping are not available for PO Box, APO/FPO/DPO or US Territory addresses.
Product Service Bulletin:
Protect Your Warranty

 

[cameronsaddress]

could this be a the issue then?

stock gm fuel pump specs :
Maximum Free Flow Rate (gph): 40
Maximum Pressure Range (psi): 9
Minimum Free Flow Rate (gph): 40
Minimum Pressure Range (psi): 7.5

carb manual:

Do not use more than 6.5 psi fuel pressure. Excessive fuel
pressure may cause flooding. If your fuel pressure is too high,
install an adjustable pressure regulator such as Edelbrock #8190,
or #1727.

https://docs.google.com/viewer?a=v&...&sig=AHIEtbTOj92nn9CkwiwFeg2g-UtaGhuY5g&pli=1



Wouldn't I see fuel spilling out though??

 

[ryoken]

yup, out the bowl vent... mechanical pump, I HIGHLY doubt your pressure is too high...

 

[ashman]

on my buddies truck we never saw fuel actually dumping out, but you could smell it.

yup, out the bowl vent... mechanical pump, I HIGHLY doubt your pressure is too high...

agreed. it usually doesn't happen with mechanical pumps, at least never that I've seen.

 

[cameronsaddress]

So if not flooding, why else would I need to floor it to get it to start?

Could the fuel be retracting out of the bowls somehow?

If it is flooding, what else would cause it if it's not the pump. Floats too high? Needle clogged?

Damn brand new carb ...