L20b not running as it did 2 days earlier.

[Datsun620longbed]

So I'm kind of a noob when it comes to auto mechanics, so my issue is my 1977 datsun 620 longbed with a L20B engine. It starts up good but doesn't want to keep running. It just sputters out and dies. I originally thought it was the fuel pump but that wasn't it and I think it's a carburetor issue just want some advice from you guys considering it's my first car just let me know what you think.

[datzenmike]

To do this in two days seems like something happened suddenly.

 

Free and easy...

Check all small vacuum lines on or near the carburetor and air filter. Look for one that's off and not connected or with a crack or split in it.

Check ignition wires

 

 

Free and some work if you have tools...

Check set the valve lash

Clean plugs

Set timing to 12 degrees BTDC

Adjust idle mixtere and speed

[TENDRIL]

debris in the carb jets?

 

'

did you go over any large potholes or bumps, that might have loosened some crud in the gas tank?

[banzai510(hainz)]

read everything on Olddatsuns.com tech section.

[herculesinwyoming]

Hitachi carb? It hates modern fuel with ethenol

[ggzilla]

My hitachis love 10% ethanol.

 

If you have a Weber you may need to take it off and rinse the fuel bowl out

 

If you have the Hitachi just remove the drain plugs, let it drain.

[banzai510(hainz)]

never had a proplem

[abbylind]

Had the same problem with my 77. Found the rubber fuel lines by the carb were cracked. Fell apart when I removed them. Replaced the fuel lines all the way past the fuel filter. Shot some carb cleaner in the carb and checked all the screws on the carb (they were loose) Runnin like a scalded dog now....