Question about 1984 Plymouth Horizon

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1984 2.2L horizon vapor locks metal lines from fuel pump there are two they go from pump behind the radiator which sucks hot air right on them then up engine to carburator and tank i guess if i insulate them will it fix it or do i need rubber lines or change direction of line will that cause a problem

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Posted on May 11, 2009

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1979 Leocraft Motorhome. With a 454. When the engine gets hot it stops receiving fuel. Any ideas? Changed fuel pump and collapsed fuel line section.


Sounds like vapor lock. Vapor lock happens when the fuel in the lines gets way to hot and boils/vaporizes and causes stalling . Have the fuel lines wrapped in an insulated wrap or relocate them away from heat sources. Sometimes winter grade gasoline will cause this also.

May 05, 2016 | Cars & Trucks

2 Answers

Over heating and blowing cold air from heater


Possibly leaking head gasket. Easiest way to check would be to fill radiator full, start engine and watch coolant level in the radiator cap opening. The top radiator hose will become hot when thermostat begins to allow coolant flow through the radiator. You may have to top off the coolant. Still with the radiator cap off watch for water belching out of the radiator neck. If coolant does belch out of the radiator cap neck, refill with water. If it belches out coolant again it would be combustion gassed forcing the coolant out of the radiator.


This process should take about 1/2 hour to diagnose if it is a head gasket leaking combustion gasses into the coolant.


The radiator fan may run once car is shut off to cool engine compartment to prevent gasoline in fuel lines from vaporizing which would cause a condition called "vapor lock". A car won't start if fuel lines are vapor locked.

Good luck, I hope this helps you to figure out the problem.

Apr 17, 2014 | 2005 Buick Rendezvous

1 Answer

1999 dodge caravon sport vaper lock


I had a 1999 Grand Caravan 3.3L and never had this problem and I lived in Fla. at the time but other vehicles that I've seen this problem in. First, is this vapor lock between the gas tank and the engine or in the engine compartment? If it's between the gas tank and the engine, you might have a rusted pin hole in the steel fuel line or sometimes there might be a section or rubber line in the fuel line where there might be movement in the system. If so, look for a rotted hose or a wet spots on the fuel line from the gas tank to the engine compartment. A tiny pin hole can leak gas out and/or air in and if it's small enough the gas can evaporate before it hits the ground. If it has started locking up in the engine compartment only after all these years, I'd have the fuel pump pressure checked. If this is the case and if it hadn't vapor locked since 1999, up until now the fuel pressure has been adequate to keep the fuel in it's liquid state in the heated environment of the engine compartment. If the pressure has gone low and the fuel line is bolted to something hot like the water pump, for example, like it was on my 1968 307 Chevy Bel Air, the fuel will boil hence, vapor lock. If this is your problem and you can't get it fixed right away, follow the fuel line up from the frame and look for it to be routed, again, near / onto something hot. If you can get it loose and away from the hot area without kinking the steel tube, this may help for a while. I don't know you or how much you know but I would advise against cutting the line and adding rubber hose as clamping a hose to a smooth steel line will eventually leak
and possibly cause a fire. If you know what you're doing or know someone who does, you could use a flairing tool and add more steel line if necessary. In any case, be careful. In the long run, it is always better to repair it or have it repaired properly. Good luck. Jeff M.

Apr 10, 2014 | 1999 Dodge Caravan

3 Answers

What is vapor lock?


Vapor lock is when a fluid in a closed system, such as in a hydrolic system, gets get hot enough to boil and produce vapor which unlike a fluid can be cimpressed thus rendering hydrolic systems inoperative. Fluids act as a solid when pressure is exerted on to them but in their gaseous state (vapor) they can be compressed and the pressure needed to move pistons is instead absorbed by the gas rather than applied to the pistons.

Feb 26, 2013 | Dodge Caravan Cars & Trucks

1 Answer

I have a 1979 Toyota Celica, it sat for years. I have lost my job of 17yrs and i need a good car. I have had a carb, fuel pump gas tank all replaced, the car runs good cold after aprx, 7 miles it chokes...


check the routing of the fuel line if it is near anything that gets hot ie: exhaust,transmission it may be causing a vapor lock also look for rusted fuel lines as they MAY be letting air into the line but not necessarily leaking, if the pump is mechanical operated by the engine( cars run on fuel and air not air and air) it will induce negative pressure in the line thereby sucking air into the line, check where the pump is mounted if it is electric it should be mounted below the bottom of the tank

Sep 08, 2012 | 1979 Toyota Celica

1 Answer

2003 Chevy Duramax 2500 HD with a vapor lock when temp is moderately hot; will not start without using prime pump on top of fuel filter housing - sometimes with low fuel level will not re-start even with...


Most likly the filter housing needs to be replaced and or the fule lines to and rom the housing. the housing has the plunger on top and the filter screwed under. The plunger goes bad on these and causes air to enter and then become air locked. this is also very comon on the IPR with the fuel filter housing mounted behind cab on frame rail driver side. road sault gets to these and degrades the unit untill it sucks air. On the c 4500 you need to get the oem fuel lines because of the tight space restrictions to route the lines. the OEM lines are molded to make the tight bends required.

Hope this helps... Good luck

May 26, 2011 | 2003 Chevrolet Silverado 2500HD

1 Answer

My 1988 Ford Bronco 5.0 has been stalling / acting like its run out of gas. (Has always run great before) I know it has plenty. Today 7.28.10 It stalled twice, first time it did it had at least 1/4 tank,...


You might have what is called vapor lock. The fuel gets so hot that it boils in the fuel pump or the lines. Do this test spay water on the fuel pump to cool it off . ( this only works for a few minutes before it gets to hot and vapor locks again ) If you can Keep the engine heat Off the lines and the Fuel pump it might help. If you have metal fuel lines near a heat source rap them with something such as rubber fuel line sliced down the middle to keep the heat off them If you are using an aftermarket electric fuel pump relocate it down low near the gas tank ( they work better pushing than pulling ) away from any heat source such as exhaust If your using the stock fuel pump try replacing it with a new one it might be getting weak Replace the fuel filter while your at it.

Jul 28, 2010 | 1988 Ford Bronco

3 Answers

I have a 87 mustang and it has a mr gasket electric fuel pump. It vapor locks all the time. i have to take fuel line off turn switch on let fuel pick back up then plug the fuel line back up and it will...


Actually vapor lock refers to a condition in the intake manifold on a carbureted engine. You don't have vapor lock. What you may have is a filter inside the tank, its nicknamed a sock. Its a fine mesh screen and may be plugging up. When you pull the fuel line the fuel flows back and unblocks a small section , until it starts too **** again and re plugs. You may also have fuel pump that starts to lose power when its gets hot. Lee

Oct 11, 2009 | 1987 Ford Mustang

1 Answer

Fuel pump not coming on


fuel pump operation on your impala is controlled by the computer. It activates the fuel pump relay when ignition is turned on, but only for a few seconds. This is called the fuel pump prime. When the computer senses a crank signal (upon start up) it will activate the fuel pump relay constant. I have found more problems with the fuel pump relay than anything. Vapor lock will not cause a no start unless it is in the fuel lines. GM systems use the manifold air temp sensor to allow for quick starts when hot......increases fuel injector on time. An intermittant fuel pump relay or bad pump will cause a no start any weather.

Jul 09, 2008 | 1995 Chevrolet Impala

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