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Author
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Topic: vapor lock
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1fstpony
Journeyman Posts: 5
From: manly,ia. USA
Registered: Jun 2004
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posted 06-21-2004 11:31 PM
 
I just bought a 66 coupe with a fresh 289 that was beefed up a little.My problem is that I keep getting vapor lock after it get's warmed up all the way.I tried putting aluminum foil around the fuel line but it still does it.I can't see anywhere that the fuel line is near the exhaust either.Anybody got any other ideas???? thanks
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N266fords
Gearhead Posts: 1662
From: Sierra Vista ,Az USA
Registered: Apr 2003
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posted 06-22-2004 12:21 AM
you may want to describe what it is doing exactly and when it is doing it. this way we can better resolve the issue.
bruce
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N266fords
Gearhead Posts: 1662
From: Sierra Vista ,Az USA
Registered: Apr 2003
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posted 06-22-2004 12:22 AM
Oh yeah, and Welcome to M&M. where are my mannors? Bruce
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1fstpony
Journeyman Posts: 5
From: manly,ia. USA
Registered: Jun 2004
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posted 06-22-2004 08:33 AM
it will start starving for gas ang get worse as you go.There is a clear fuel filter on it and I noticed it's allways almost empty after I turn it off or it dies on me. Oh,and thanks. quote:
Originally posted by N266fords:
Oh yeah, and Welcome to M&M. where are my mannors? Bruce
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ddenton749
unregistered
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posted 06-22-2004 08:39 AM
Wow, this is wierd. Check out the topic "73 mach 1 keeps dying out while driving" started by rumble73 on 6/15. There is another one just started by kwalger on 6/18 "no fuel flow" which describes similar symptoms.
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V8 Thumper
Gearhead Posts: 4777
From: Phoenix, Arizona
Registered: Dec 2001
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posted 06-22-2004 08:52 AM
What fuel pump is on it? I suspect low pressure/volume, possibly combined with incorrect carburetor tune. When it dies out, is it hard to restart? What carb is on it?Welcome to M&M  ------------------
1965 GT coupe, 333ci aluminum headed/solid cammed stroker, four speed, 3.70:1 9" All Blue Oval, no blue bottle
http://mustangsandmore.50megs.com/V8Thumper.html
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whiteknight289
Gearhead Posts: 1391
From: Wheaton, IL, USA
Registered: Mar 2004
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posted 06-22-2004 09:42 AM
Welcome to Mustangsandmore! Okay, how 'bout writing us a paragraph or two describing the modifications to the engine, the driving conditions the fuel starvation occurs under, temperature condtions, etc.
Like Bruce said, without enough info we are all going to be throwing out all sorts of ideas and this will turn into a thread with 30 postings on it just trying to nail down the facts.
If your problem is indeed vapor lock, it is because the fuel is getting so hot that it boils or turns to vapor. Your fuel pump is designed to push liquid, not air. Was the previous owner having the same problems? Is it hot out when you drive? What kind of gas are you using? How many miles on your fresh rebuild? What carb and intake are you running? Do you have a carb spacer? Is the engine running hot? Do you have new radiator? How long are you driving before it starts to die? Will it restart after cooling down for 10 minutes?
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1fstpony
Journeyman Posts: 5
From: manly,ia. USA
Registered: Jun 2004
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posted 06-22-2004 11:31 PM
Thanks for welcoming me.Here's the story on the car.I bought it from a lady who's husband had died right after he rebuilt the motor,he only put about 100 miles on it.This is what I know about it.It has a mild cam in it,a Edelbrock 600 cfm carb.and a Edelbrock performer rpm intake.It also has a MSD6A ignition and coil.Other than that it's mostly stock.It also has a new aluminum radiator in it.It only takes about 10 to 15 min. before it starts acting up,it will start up again just fine after it sets for about 15 min.The engine runs a little warm according to the factory gauge,but I'm not sure I trust that.I would think with a new radiator it would run fairly cool.There is no spacer on the carb,and as far as the gas goes I haven't even had the chance to put gas in it yet.Thanks for everyones help. quote:
Originally posted by whiteknight289:
Welcome to Mustangsandmore! Okay, how 'bout writing us a paragraph or two describing the modifications to the engine, the driving conditions the fuel starvation occurs under, temperature condtions, etc.
Like Bruce said, without enough info we are all going to be throwing out all sorts of ideas and this will turn into a thread with 30 postings on it just trying to nail down the facts.
If your problem is indeed vapor lock, it is because the fuel is getting so hot that it boils or turns to vapor. Your fuel pump is designed to push liquid, not air. Was the previous owner having the same problems? Is it hot out when you drive? What kind of gas are you using? How many miles on your fresh rebuild? What carb and intake are you running? Do you have a carb spacer? Is the engine running hot? Do you have new radiator? How long are you driving before it starts to die? Will it restart after cooling down for 10 minutes?
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whiteknight289
Gearhead Posts: 1391
From: Wheaton, IL, USA
Registered: Mar 2004
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posted 06-23-2004 12:42 AM
I had a problem on a 65 mustang with an Edelbrock carb, this may be coincidence or it may be inherent to the design of the Edelbrock. Anyway, to overcome it we installed a high performance fuel pump and carefully routed the fuel line up to the carb making sure it was nowhere near anything metal that wousl give off heat. Last thing we did was split a long piece of rubber hose and wrapped it around the steel fuel line to insulate it from heat. You may have other fuel delivery problems, such as mentioned on the above noted posts. You may have a partially blocked fuel pick-up inside the gas tank, you may have a weak fuel pump, you could even have a pinhole in the fuel line that is acting like a vacuum leak, not allowing the fuel pump to suck up only fluid. You could also try a 1/4" gasket or 1/2" to 1" insulating spacer under the carb.
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1fstpony
Journeyman Posts: 5
From: manly,ia. USA
Registered: Jun 2004
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posted 06-23-2004 08:35 AM
Thanks for all your help,hopefully I will get it figured out soon.I will let you know what it was.Thanks again,Curt. quote:
Originally posted by whiteknight289:
I had a problem on a 65 mustang with an Edelbrock carb, this may be coincidence or it may be inherent to the design of the Edelbrock. Anyway, to overcome it we installed a high performance fuel pump and carefully routed the fuel line up to the carb making sure it was nowhere near anything metal that wousl give off heat. Last thing we did was split a long piece of rubber hose and wrapped it around the steel fuel line to insulate it from heat. You may have other fuel delivery problems, such as mentioned on the above noted posts. You may have a partially blocked fuel pick-up inside the gas tank, you may have a weak fuel pump, you could even have a pinhole in the fuel line that is acting like a vacuum leak, not allowing the fuel pump to suck up only fluid. You could also try a 1/4" gasket or 1/2" to 1" insulating spacer under the carb.
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68 S-code GT
Gearhead Posts: 3835
From: Sayreville, NJ, US
Registered: Mar 2000
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posted 06-26-2004 08:11 AM
Try a carb spacer and if that doesn?t help try an electric fuel pump also. It worked for me to stop vapor lock. I had a clear filter between the fuel pump and t5he carb and you could actually see the fuel bubbling away.You might also want to try a lower temp thermostat
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Ed S. 68 S-code FB GT 4spd(now C6)/3.25 PS PDB
68 J-code(now 289) Cp Sprint"B" C4/3L00-9" PDB PS AC
99 F150 XLT Ext/cab, 4X4, 5.4L, 3L55 [This message has been edited by 68 S-code GT (edited 06-26-2004).]
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1fstpony
Journeyman Posts: 5
From: manly,ia. USA
Registered: Jun 2004
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posted 06-26-2004 11:21 PM
I tried a spacer today and it didn't help.You said to try a electric fuel pump,how about just a bigger one.Why do you suggest a electric one?Thanks. quote:
Originally posted by 68 S-code GT:
Try a carb spacer and if that doesn?t help try an electric fuel pump also. It worked for me to stop vapor lock. I had a clear filter between the fuel pump and t5he carb and you could actually see the fuel bubbling away.You might also want to try a lower temp thermostat
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68 S-code GT
Gearhead Posts: 3835
From: Sayreville, NJ, US
Registered: Mar 2000
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posted 06-29-2004 11:28 PM
Just think of your cooling system being under pressure, which in turn raises the boiling point of the coolant. You can do that to you fuel buy installing the electric pump. With the pump not being installed on the block your fuel will also be a little cooler.
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68 S-code GT
Gearhead Posts: 3835
From: Sayreville, NJ, US
Registered: Mar 2000
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posted 07-07-2004 08:00 AM
So, have you try anything else?
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