Vapor lock remedies how to#
Vapor lock remedies install#

Issue persists.ĭetails: It's a '99 290 Powerquest with a pair of Mercury 7.4MPI's with the CoolFuel II system. I thought that might be the issue so I burned through that tank & recently refilled with 90 octane rev fuel (ethanol free). This year I put fuel in around mid/late April (likely contained 10% ethanol). The other odd thing is that I never once had the issue last season (first season with the boat). Eventually the sound of the fuel pump changes to a significantly deeper tone & from that point, the engines will fire & run without any issue. Getting the engines to re-start after that is a bear & often takes 20+ minutes of cycling the key & bleeding the fuel rail to get all the air out. This leads me to believe I have an issue with vapor lock although I am baffled as to why it would start & run so well for the first 30-60 seconds. I can purge the schrader valve at the end of the fuel rail & I get a mixture of fuel & air. I then cycle the key & listen to the fuel pump which sounds like it has no load on it (trying to pump air). Engines start up & run great through all RPM's for ~30-60 seconds & then they die. Then a few hours later we get ready to head home. I leave the engines idle for ~5-10 minutes while we thrown the anchor & get situated. Run great, no issues until we go to our local watering hole & sit. Symptom: Engines fire immediate when cool. With the use of proper thermal barriers, you’ll reduce the chances of vapor lock fuel injection and provide more consistent and better-performing protection.I apologize in advance for bringing up the topic of vapor lock again but I haven't found anything that sounds just like what I'm dealing with. This will keep the fuel in the tank cooler and less susceptible to increased temps that could affect fuel-pump operation. However, our Sticky Shields can be used around fuel tanks to protect it from heat. In these cases, installing a thermal-barrier sleeve might be difficult or impractical. Protecting under your vehicle where the fuel lines run next to frame rails or floor pans is another key area to protect for preventing vapor lock. FR Shields protect fuel rails from ambient heat coming from the top of the engine and the rest of the vapor lock engine compartment, so the fuel isn't heated to performance harming temperatures before entering the injectors.

Vapor lock remedies install#

Our Heatshield Products’ FR Shields thermal barriers install around the fuel rails, shielding them from underhood heat and preventing fuel entering the rails from being heated. Solutions for Fuel Injected Vehicles Even if they're aluminum, fuel injector rails can soak in ambient heat and transfer that heat to the fuel running through them, potentially causing a vapor lock problem. Not only do these sleeves prevent vapor lock, but they also protect the engine lines themselves from heat damage. Heatshield Products Thermaflect Sleeve is an effective automotive heat barrier to protect exposed steel and rubber fuel lines in an engine compartment from ambient heat that would cause the fuel inside the lines to reach a high enough temperature to cause vapor lock. And, if you have a show vehicle and need heat protection without compromising the restored look, the Thermaflect Sleeve can be removed! A roll of Thermaflect Sleeve can be cut to various lengths, so different sections of fuel lines can easily be protected.

Our engine heat shield sleeves have a built-in, high-temp hook-and-loop fastener system which prevents needing to remove fuel lines and makes installation a breeze. For carb-equipped vehicles, one of the easiest solutions to preventing vapor lock is to use a thermal-barrier sleeve on the lines such as a Thermaflect Sleeve from Heatshield Products. The solution? Protect your fuel lines from getting hot. Vapor lock typically happens during summer months when high ambient temps, combined with the heat of a vehicle’s engine and exhaust, is transferred to the fuel lines. The result is fuel starvation causing the engine to run rough or completely stall. Fuel pumps are designed to pump liquid, not air, and the increased pressure inside the fuel lines keeps the fuel pump from being able to keep the fuel moving. Vapor lock happens when the temperature of fuel gets high enough to transform liquid into a vapor state. But, proper use of thermal barriers is helpful in preventing vapor lock, no matter how hot the day gets. If you’re a racer, it can put the car on the trailer well before you’re ready to leave the track. Whether you have a carburetor or use fuel-injection in your vehicle, vapor lock can bring your vehicle to a standstill causing hours of frustration.

Vapor lock remedies how to#

If you’re wondering how to prevent vapor lock, try using a thermal barrier like a heat shield, or heat sleeve. How To Prevent Vapor Lock Using Thermal Barriers