78 460, LONG Cold Crank to Start... Ideas?
#1
Join Date: Jul 2011
Location: Zephyrhills, Florida
Posts: 184
Likes: 0
Received 10 Likes
on
10 Posts
78 460, LONG Cold Crank to Start... Ideas?
78 460 with an Edelbrock Performer, mechanical fuel pump and inline pressure gauge...... Clean filter..... Let the truck sit for 2 to 3 days or more, and the pressure gauge reads absolute zero.... Set the choke, crank the starter, and it has to crank it's brains out for 30 seconds to get gas and fire. After that, it starts right up every time, and instantly. Cold crank is driving me nuts. What are your thoughts? Fuel pump? Carb float? There are NO gas leaks...... Zero. I'm interested to hear what you'se guys think.
#2
#3
Performer is an intake, I assume you mean Edelbrock AFB carb.
This is one of the reasons I hate them, I have several that have done this since they were new. I have no idea why. put a 4160 on and they start instantly. the fuel is draining out of the float bowl and I don't know how you stop it, or where it's going.
If it's not an AFB what do you have it can probably be fixed.
This is one of the reasons I hate them, I have several that have done this since they were new. I have no idea why. put a 4160 on and they start instantly. the fuel is draining out of the float bowl and I don't know how you stop it, or where it's going.
If it's not an AFB what do you have it can probably be fixed.
#4
#6
Join Date: Nov 2009
Location: starship enterprise
Posts: 2,213
Likes: 0
Received 74 Likes
on
55 Posts
try a cooler thermostat, better gas (91 octane or better yet- avgas lo lead 100) and follow up before winter. If you don't want to try this, then let it set an hour, start it and run it 5-10 seconds and let it set another hour, start it and let it run 5-10 seconds and by then I bet it will have gas in carb and not be soooo hot it boils it. Remember when a carburetor is running, it draws air through and cools it keeping gas from vaporizing. as soon as shut off it boils gas and heat soaks. just some thought to try.
#7
ALL of my trucks do that. Drives me nuts too. 460, 400, 351m, 6 cyl... you name it. All have edelbrock carbs except for the 6cyl. thats stock. Thanks for the anti backflow check valve suggestion 77&79f250, I have been thinking that would solve it for a while now, and you just made me order a few!
Trending Topics
#8
ALL of my trucks do that. Drives me nuts too. 460, 400, 351m, 6 cyl... you name it. All have edelbrock carbs except for the 6cyl. thats stock. Thanks for the anti backflow check valve suggestion 77&79f250, I have been thinking that would solve it for a while now, and you just made me order a few!
#10
The following users liked this post:
#12
The following users liked this post:
#14
#15
Mechanical pumps usually work or they don't. There are exceptions like the pump I replaced on the 86 with a 460. after cooling off it would start and run for about 10 minutes and than stall.
Would not restart at all unless you put gas in the carb. Replaced the pump and problem solved. Never experienced that with a mechanical pump before.
If I don't start my truck after a week or more I must pump the pedal several times and crank it for longer than I wish for fuel to fill the bowl.
I'm sure if I spliced in an electric pump, it would solve that issue but I'm waiting on this new mechanical pump to fail before I go down that road.
I read this alot with edelbrock carbs, just do a search you'll find this on jalopy and other auto forums besides here..