hot starting issue. Fuel Boiling????

Here is a link to a video that shows how easy today's fuel boils. I thought it was interesting.

 

If you want to try a different fuel, 100LL (low lead,dyed blue) is $5.65/gal. self serve at our local airport.

 

www.airnav.com will pull the 100LL AvGas prices for all of the FBOs near a zip code. prices near me range from $4.05 to $5.39.

take a 50 gallon drum with you and you can make it worth your while to save $1.34 a gallon.

i agree with Larry that just getting a wood / plastic spacer plate would probably help a lot and, in fact, will probably fix the problem. but while we've got a known problem we may as well make sure we're fixing it right.

you might fix the problem in PA, but if you don't make a point of checking everything while you're here don't be surprised if the problem shows up again if you take the car to Fla or TX or something.

 

A phenolic spacer worked wonders for me. Mopar had a factory spreadbore spacer that's about 3/8 inch. I have one of those sitting up on the workbench since I ended up using the Moroso open 1/5 inch phenolic spacer.

 

I used A heat shield like that on my 72 skylark Larry told me about and it made A big difference.
Around my area most gas has ethanol in it and I think that was my problem.

 

This may be a stupid question Larry but since my engine was just rebuilt, and it was built to handle todays unleaded fuels, would using leaded race fuel present any issues?

 

lead is a problem if you have a catalytic convertor, because it will clog the convertor up. so far as the engine running, that's the only concern ... causing backpressure from the exhaust system. a 1970 model should not have a cat on it, those weren't OEM from the factory until a few years later, i think in 74 or 75.

burning lead, otoh, is a somewhat of a health hazard. i'd keep toddlers away from the car if you're going to run 100LL or any leaded race fuels.

 

UPDATE: I added 5 gallons of VP 110, and 15 gallons of non-ethanol 90 gas on Friday. I ran the car as before and this did not solve my hot starting problem.

I think I am going to try a different air cleaner, sounds silly but I gotta start with the easiest. I have been running a big Cadillac style air cleaner, it really is like a big heat umbrella over the carb, im gonna go back to the cheap chrome air cleaner and see what happens.

if this doesn't help im going to add a taller carb spacer, and last resort would be a carb heat shield. I will keep you guys updated.

 

Air Cleaner Chrome by 70skylark350 posted Sep 2, 2019 at 7:34 AM

Air Cleaner Cad by 70skylark350 posted Sep 2, 2019 at 7:34 AM

 

I like the look of the Cadillac style air cleaner but I could see it contributing to my heat issue, what do you guys think? the top picture is the one im going to try.

 

Give it a go and see if it helps. Spacer might help. Fire wall doesn't look like the car ever had a/c, so re-attaching the fuel return line to the tank to stop fuel boil will not an option.