Vapor locking... Aargh!
Thread Starter
|
Junior User
Joined: Jul 2006
Posts: 50
Likes: 0
Vapor locking... Aargh!
Hello,
My truck is vapor locking after it reaches a certain temp, I think. After a "cold" start it runs great for approx. 10-15 min, but then it stalls and it will not start until it sits for a while and cools down.
I rebuilt the carb and replaced the fuel line from the fuel pump to the carb. I also installed a new fuel pump with insulation to the line so that my fuel will not boil from engine block. All this I did before this new challange.
The problem started shortly after I mud bogged for a couple of hours and drove over a dip on the trail. came down hard and it stalled. When I went to crank it on again, it hassitated a tad but it started. Then a minute later it stalled and would not start. But did turned over as it presently does.
Can anyone give me a tip in what might of happened that's causing this stalling raw deal and how I might be able to fix it.
Some basic truck info.;
400 modified
2 barrel carb
c6 automatic
Thanx in advance!
Mud
oh by the way, as if you couldn't tell... I'm a newbie here
My truck is vapor locking after it reaches a certain temp, I think. After a "cold" start it runs great for approx. 10-15 min, but then it stalls and it will not start until it sits for a while and cools down.
I rebuilt the carb and replaced the fuel line from the fuel pump to the carb. I also installed a new fuel pump with insulation to the line so that my fuel will not boil from engine block. All this I did before this new challange.
The problem started shortly after I mud bogged for a couple of hours and drove over a dip on the trail. came down hard and it stalled. When I went to crank it on again, it hassitated a tad but it started. Then a minute later it stalled and would not start. But did turned over as it presently does.
Can anyone give me a tip in what might of happened that's causing this stalling raw deal and how I might be able to fix it.
Some basic truck info.;
400 modified
2 barrel carb
c6 automatic
Thanx in advance!
Mud
oh by the way, as if you couldn't tell... I'm a newbie here
Postmaster
Joined: Apr 2000
Posts: 2,838
Likes: 6
From: SD
Next time it vapor locks and dies, (with the key off) take off the air cleaner and move the throttle - notice if gas squirts down the throat of the carb. If it truly is vapor locked, there will be no gas squirts. If there is gas in the carb, check for spark.
Knowing whether it's a spark problem or fuel problem is the first step.
Marty
Knowing whether it's a spark problem or fuel problem is the first step.
Marty
Cargo Master
Joined: Apr 2004
Posts: 2,574
Likes: 4
From: Golden, CO
After the checking float level, go over every inch of fuel line. Is the rubber hose on the steel line to the tank new? Steel line smashed anywhere?
Go over your evap fuel system: The canister, vent in the tank, all the hoses. Maybe a vacuume leak in the cannister purge (thermal vac switch?) or maybe the tank is not venting. If you decide to drop the tank, check the fuel pick up tube for rust or holes. I had one of those fall apart in my hands-nasty. Hopefully you won't get that far. LOL
Go over your evap fuel system: The canister, vent in the tank, all the hoses. Maybe a vacuume leak in the cannister purge (thermal vac switch?) or maybe the tank is not venting. If you decide to drop the tank, check the fuel pick up tube for rust or holes. I had one of those fall apart in my hands-nasty. Hopefully you won't get that far. LOL
Last edited by Hypoid; Jul 28, 2006 at 01:48 AM.
Thread Starter
|
Junior User
Joined: Jul 2006
Posts: 50
Likes: 0
Thank you for the replies ya'll!
I've yet to investigate everything that was requested.
-
I was looking at my truck last night. I let it run/idle while in park for 20 some minutes and when it reached a high temp in the engine I noticed a small air leak from the manifold's gasket. The reason I feel it was a leak was because I noticed some build up bubling up from the right side of engine block and where the manifold joints. So I was wondering if that could be effecting the spark wires from that side where heat is blowing out from the leak.
I also checked for temperature on the opposite side of engine and it appeared cooler.
So, do you guys think that my spark plug wires may be getting over heated by the broken gasket and causing it to stall?
FYI. The truck iventualy stopped on its own as before.
Thanx again!
Mud
-
I was looking at my truck last night. I let it run/idle while in park for 20 some minutes and when it reached a high temp in the engine I noticed a small air leak from the manifold's gasket. The reason I feel it was a leak was because I noticed some build up bubling up from the right side of engine block and where the manifold joints. So I was wondering if that could be effecting the spark wires from that side where heat is blowing out from the leak.
I also checked for temperature on the opposite side of engine and it appeared cooler.
So, do you guys think that my spark plug wires may be getting over heated by the broken gasket and causing it to stall?
FYI. The truck iventualy stopped on its own as before.
Thanx again!
Mud
Last edited by 77-f250-Mud; Jul 28, 2006 at 02:10 PM.
New User
Joined: Jan 2008
Posts: 0
Likes: 24
Rubber fuel line can cause Vaopur lock.
Steel line is best as it keeps the fuel cooler.
IMO, you have carb problems.
Spray some carb cleaner using the wand everywhere around the intake seal and see just how big that leak is.
Steel line is best as it keeps the fuel cooler.
IMO, you have carb problems.
Spray some carb cleaner using the wand everywhere around the intake seal and see just how big that leak is.
Trending Topics
Thread Starter
|
Junior User
Joined: Jul 2006
Posts: 50
Likes: 0
Ok I am getting fuel in the throat of the Carb.
Originally Posted by 73Custom
Next time it vapor locks and dies, (with the key off) take off the air cleaner and move the throttle - notice if gas squirts down the throat of the carb. If it truly is vapor locked, there will be no gas squirts. If there is gas in the carb, check for spark.
Knowing whether it's a spark problem or fuel problem is the first step.
Marty
Knowing whether it's a spark problem or fuel problem is the first step.
Marty
-
A small miss-up on my gasket leak though (on reply #5). I meant to say Header gasket leak and not manifold.
Thanx guys!
Mud
Last edited by 77-f250-Mud; Jul 29, 2006 at 04:21 PM.
FTE Stories
Ford Trucks for Ford Truck Enthusiasts
2027 Ford Super Duty Buyer's Guide (Every Model, Engine, & Package)
Brett Foote
Top 10 Ford Truck Tragedies
Joe Kucinski
AEV FXL Super Duty - the Super Duty Raptor Ford Doesn't Make
Brett Foote
Lobo Vs Lobo: Proof the F-150 Lobo Should Be Even Lower!
Michael S. Palmer
Ford's 2001 Explorer Sportsman Concept Looks For a New Home
Verdad Gallardo
10 Best Ford Truck Engines We Miss the Most!
Joe Kucinski
2026 Shelby F-150 Off-Road: Better Than a Raptor R?
Brett Foote
2027 Super Duty Carhartt Package First Look: 12 Things You NEED to Know!
Michael S. Palmer
10 Most Surprising 2026 Ford Truck Features!
Joe Kucinski
Thread Starter
|
Junior User
Joined: Jul 2006
Posts: 50
Likes: 0
engine cuts off after...
Originally Posted by Mil1ion
No, The fuel should spray directly into those 2 circle things (called venturi's) down inside the carb.
This has peaked my interest: what is happening that you are considering it....vapour lock ?
This has peaked my interest: what is happening that you are considering it....vapour lock ?
-
yep. fuel is being sprayed right above them 2 barrel thingies. I'm going to replace the header gasket tonight. That leak seems like it's generating alot of heat on 2 spark plug wires.
Mud
Last edited by 77-f250-Mud; Jul 29, 2006 at 07:35 PM.
Senior User
Joined: Aug 2005
Posts: 387
Likes: 0
Man, heat on that wire will only make a misfire at most! Do a full tuneup, plugs, wire, cap, rotor, ect. Have you considered it may be an idle issue? They're supposed to do a fast idle for warm up then slow down for normal idle, have you tried adjusting your idle?
New User
Joined: Jan 2008
Posts: 0
Likes: 24
So... is it always 15-20 minutes or does the time vary any more ?
It sounds to me like an intermittent fuel pump problem.
Have you poured gas down the carb right after it stalls ..then try and start it right away after doing that ?
It sounds to me like an intermittent fuel pump problem.
Have you poured gas down the carb right after it stalls ..then try and start it right away after doing that ?
Thread Starter
|
Junior User
Joined: Jul 2006
Posts: 50
Likes: 0
Originally Posted by Terran
Man, heat on that wire will only make a misfire at most! Do a full tuneup, plugs, wire, cap, rotor, ect. Have you considered it may be an idle issue? They're supposed to do a fast idle for warm up then slow down for normal idle, have you tried adjusting your idle?
I gave it a full tune-up by replacing.
new cap and rotor
new plugs
new wires
new distributor
overhauled the carburator
new fuel filter at carburator
new short fuel hose (approx. 1" long) that connects to the carbs fuel filter.
new fuel line (metal) and fully insulated.
new mechanical fuel pump.
and timed the engine because of new distributor.
All of that I did and the truck ran great. Until I gave it a hard run mud bogging and by mistake took flight in the trail and landed hard and stalled. Thats when the challange arrived. I rechecked everything that I worked on and nothing seemed out of whack. Except that I noticed the header gasket leak this time. Eitherway I'm gonna have to replace that gasket.
New User
Joined: Jan 2008
Posts: 0
Likes: 24
Okay, I revert my answer to a Major Carb problem.
I think you have something in that carb that has gone awry,
the only other thing would be the mesh filter on the fuel pickup would get plugged from something that got dislodged in the fuel tank.
I'll check out a carb ....for parts that could be dislodged.
I think you have something in that carb that has gone awry,
the only other thing would be the mesh filter on the fuel pickup would get plugged from something that got dislodged in the fuel tank.
I'll check out a carb ....for parts that could be dislodged.
Thread Starter
|
Junior User
Joined: Jul 2006
Posts: 50
Likes: 0
yes-could be-nope...
Originally Posted by Mil1ion
So... is it always 15-20 minutes or does the time vary any more ?
Originally Posted by Mil1ion
It sounds to me like an intermittent fuel pump problem.
Originally Posted by Mil1ion
Have you poured gas down the carb right after it stalls ..then try and start it right away after doing that ?
Mud