most common cause of backfire?

OK Arde, it's cleaner than my kitchen too! Interesting observation regarding the FI hose. I will change out tomorrow, don't know how those hoses snuck in there? Was not aware the ID was smaller but that makes sense and I do have some stock new carb hose- I'll check all around as well incase any snuck into the tank area-what was I thinking?

Mr bump, as near as I can tell, the most recent timing chain/gear change possibility was 1983 as that is the year stamped on the head but there is no guarantee that either was changed at that point- the engine has 94K on it but I'll revisit the timing.

Thanks all!
 
The difference between fuel injection hose and carburetor hose has only to do with the working pressure of the hose. Carburetor hose is rated at less than 50psig, while FI hose is usually rated over 200psig. Having FI hose in a carbureted system only means that your wallet is a little bit thinner for having spent the extra money for the higher rated hose. If this hose fits over your fuel fittings and carries fuel it will work just fine.
 
Filters

of the type shown in the foto have been known to be restrictive. If plastic, can be a fire hazard.

The height of the filter/ supply is abnormal. Usually, near the manifold. The pump works harder under some conditions and can back siphon under others.

I would suggest a different route for the first carb past and around with the T where the sharp bend is coming out to the rear carb.

Usually, my carbs can sit for two weeks and start up if everything is optimum.
 
61, or anyone else - do you have a shot of the proper placement of the fuel filter and the fuel hose routing. This is the way the car came... I think, so I just followed what was there but the sharp bend and the close proximity to the linkage-albeit an aftermarket carb set up-makes me think that maybe I followed the wrong directions. I have a proper filter but would like to get the placement correct before wasting any more hose.

Thanks all!
 
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