Engine dies when hot due to gas boiling in carb

[deerslayer]

Engine dies when hot due to gas boiling in carb. 160000miles on engine. V8 with 125 to 130 psi comp. Will rings cure the problem? Or is it the gas they're making now? 67 bronco with 289.<br><br>Deerslayer

 

[howiebilt]

:

 

[Jeepster]

get a phenolic resin spacer between the carb and manifold.<br><br>example

 

[zeusakira]

my 84 mustang had a aluminum heat shield under the carb. It is only about 1/8" thick and I imagine that is its intended purpose.

 

[stevew]

If you're running the stock 2bbl with that wimpy screw in gas filter , pitch it . Get a large clear in line filter , between the pump & carb . Just a plugged filter will cause what you're describing . And btw , your '67 tank has no provisions for return lines .

 

[Guest]

been there too

Know the problem well. The fuel it self is not the issue. The underhood temperature is causing the fuel to percolate in the bowl(s). The fuel boils over into the vents flooding the engine. Not so obvious when running, but will kill the engine at idle.<br>To solve the problem in both my '75, 4V, 12:5:1, 351C Bronco and '68, 8V, 11.7:1, 427 side oiler GT 500 used 1-inch tall, 4-hole, penolic spacers. If using tube headers problem is only componded. Adding a heat shield under the bowl(s) helps too, as does a high pitch, non clutch fan to move air thru the engine compartment.<br>Be certain to use a good quality (Felpro) gasket on each side of the carb spacers.<br>Understand hood clearance can limit spacer thickness. Thinner spacers, 3/4, 1/2, and 1/4 are available.<br>Engine builders use these different thickness to tune plenum volume.

 

[deerslayer]

Re:been there too

[quote author=vtdon link=board=5;threadid=12541;start=0#93576 date=1040571657]<br>Know the problem well. The fuel it self is not the issue. The underhood temperature is causing the fuel to percolate in the bowl(s). The fuel boils over into the vents flooding the engine. Not so obvious when running, but will kill the engine at idle.<br>To solve the problem in both my '75, 4V, 12:5:1, 351C Bronco and '68, 8V, 11.7:1, 427 side oiler GT 500 used 1-inch tall, 4-hole, penolic spacers. If using tube headers problem is only componded. Adding a heat shield under the bowl(s) helps too, as does a high pitch, non clutch fan to move air thru the engine compartment.<br>Be certain to use a good quality (Felpro) gasket on each side of the carb spacers.<br>Understand hood clearance can limit spacer thickness. Thinner spacers, 3/4, 1/2, and 1/4 are available.<br>Engine builders use these different thickness to tune plenum volume. <br>[/quote]<br>Where can a phenolic spacer be purchased for the Bronco carb? Deerslayer<br>

 

[deerslayer]

Where can a phenolic spacer be purchased?

 

[Guest]

any performance carb shop

[quote author=deerslayer link=board=5;threadid=12541;start=0#93584 date=1040575565]<br>Where can a phenolic spacer be purchased?<br>[/quote]http://www.holley.com/HiOctn/ProdLine/Products/FMS/FMSCA/17-65.html