View Full Version : 1982 351 wont start when hot...help!!!

06-22-2007, 07:42 PM
so I have a 1982 19 skier ford 351 holley carb. starts great when i get to the lake. after running for a couple of hours (totally fine) ill shut the engine off to swim/relax maybe 30 min. then it wont start. engine will roll over but to fire. usually after 20 min of trying it will finally start but its getting annoying! any ideas i have had everything redone that i can think of:
carb rebuilt
new fuel pump
new plugs wires ect (tune up)
new alternator
new water seperator

thanks alot for your help!

06-22-2007, 07:53 PM
starter ?

06-22-2007, 08:24 PM
Could be vapor lock. Cover the fuel line from the fuel pump to the carb, with aluminum foil and see if it helps, by blocking the heat from the engine and the engine compartment off the line.

Bruce Carr
06-23-2007, 08:40 AM
Do you still have points in the distributer? Original coil?

06-23-2007, 12:09 PM
new coil, and new points

06-23-2007, 12:57 PM
Does your engine cover have the rear vent?

I know mine was added at the dealer before I picked up mine because they were having problems with vapor lock on the early 82's.

Maybe open the engine cover when you are swimming to keep the heat from building up or maybe keep the blower runningto kep a air flow around engine to keep the heat down.

Other than that, you tried everything I can think of.

06-23-2007, 01:13 PM
no vent in the cover, but i was wondering if that could be a problem
ive never heard of vapor lock...is that a common problem? ill try the aluminum foil trick first

06-23-2007, 01:26 PM
You need to get heat out of the engine area. I suggest adding a vent to the rear of the engine cover.

06-23-2007, 01:34 PM
no vent in the cover, but i was wondering if that could be a problem
ive never heard of vapor lock...is that a common problem? ill try the aluminum foil trick firstThis is a pretty common problem with non-fuel injected engines, and the scenario you describe is typical....runs fine, engine gets to operating temp and heats up the engine compartment, shut it off, heat soak causes the temp to go even higher in the absence of coolant circulation, fuel in the lines boils and the vapor causes enough pressure in the fuel lines that the mechanical fuel pump can't get fuel to the carb. Let it sit for awhile, it cools off, the pressure subsides and it can start. The key is to keep the fuel lines cool, like with an engine compartment vent and/or blower, insulating the fuel lines, or all of the above. Aluminum foil might work, but it doesn't insulate, only reflects heat. OTOH, it's a cheap fix if it works. If venting, blowing, or foil do work, you might consider some actual fuel line insulation, either a heat-sock (http://www.jcwhitney.com/autoparts/Product/tf-Browse/s-10101/Pr-p_Product.CATENTRY_ID:2005764/p-2005764/N-111+10201+600010263/c-10101), or reflective foil tape (http://www.jcwhitney.com/autoparts/Product/tf-Browse/s-10101/Pr-p_Product.CATENTRY_ID:2006313/p-2006313/N-111+200728563+600012817/c-10101).

http://www.jcwhitney.com/wcsstore/jcwhitney/images/imagecache/G_16313G_SW_1.gif http://www.jcwhitney.com/wcsstore/jcwhitney/images/imagecache/G_15764G_SW_1.gif;pvd419a42b49842588

06-23-2007, 02:26 PM
sweet...thanks alot

06-23-2007, 08:57 PM
If I could throw one more thing in there, I know you did the tune up but one of the best things I ever did to my boat was add electronic ignition. The old points system is a real bear. I've never had a problem firing since ( knock on wood )!!!