Understanding The Fuel Pressure Solenoid In Your 1999 Eclipse Gsx

The fuel pressure solenoid in a 1999 Mitsubishi Eclipse GSX is responsible for increasing fuel pressure during hot engine starts to prevent fuel vapour lock. The part number for this component is MD113721.

The fuel pressure solenoid is located on the firewall

The fuel pressure solenoid is responsible for raising the fuel pressure during hot engine starts. This helps to prevent vapor lock and potential hard-start issues on warm days. The solenoid is controlled by the engine control unit (ECU), which activates it when the air intake temperature exceeds 140ºF (60ºC) and the engine coolant temperature is above 194ºF (90ºC). The ECU also increases fuel injector activation duration during this time, leading to a richer fuel mixture.

While some people choose to remove the fuel pressure solenoid, it is not necessary and may not solve any rich-running issues. Removing it will result in a check engine light and may cause issues with emissions testing.

If you are experiencing problems with your fuel pressure solenoid, it is recommended to check the electrical connector and all vacuum lines before attempting to replace the part. You may also try bypassing the solenoid by connecting the vacuum line directly from the manifold to the fuel pressure regulator. However, if you choose to remove or bypass the solenoid, be aware that it may still be necessary to turn off the check engine light using software.

The part number for the fuel pressure solenoid is MD113721

The fuel pressure solenoid is an important component in the fuel system of your 1999 Mitsubishi Eclipse GSX. Its function is to regulate fuel pressure, particularly during hot engine starts, to prevent vapor lock. While some consider it non-essential, it is a good idea to replace it if it is faulty, as a faulty solenoid can cause a check engine light and may impact emissions and fuel measurement.

Now, if you are looking to replace the fuel pressure solenoid in your 1999 Eclipse GSX, the part number you need is MD113721. This is the correct part number for all turbo 2G Mitsubishi Eclipse models, including the 1999 GSX. You may be able to find this part at a dealership, but it can be challenging to source a brand new one. eBay is a common source, but be cautious of sellers from Japan who may charge additional customs fees. Junkyards are another option for finding this part.

When replacing the fuel pressure solenoid, you will find it located on the firewall, with a hose running to the fuel pressure regulator. Be sure to also check the electrical connector to the solenoid. Additionally, if you remove the solenoid, you will need to turn off the check engine light using software, as it will not pass emissions otherwise.

If you are handy and want to attempt a repair yourself, you can try bypassing the solenoid. This involves connecting the vacuum line from the manifold directly to the fuel pressure regulator and looping the lines on the solenoid. However, this may not be a permanent solution, and you may still need to replace the solenoid eventually.

The fuel pressure solenoid is not necessary and can be removed

The fuel pressure solenoid is designed to increase fuel pressure during hot engine starts to prevent vapor lock. However, it is not often used and some people have reported that removing it had no impact on their vehicle's performance. In fact, some people have suggested that removing it might even help with hard-start problems on hot summer days.

If you do decide to remove the fuel pressure solenoid, you can simply bypass it by connecting the vacuum line from the manifold directly to the fuel pressure regulator and looping the lines on the solenoid. Keep in mind that removing it will cause a check engine light to come on, and your vehicle may not pass emissions tests unless you can turn off the check engine light using software. So, while it is not necessary for the basic functioning of the car, there may be some inconveniences associated with its removal.

Additionally, while it may be tempting to remove various components to reduce weight or simplify the engine bay, it is important to carefully consider the purpose and function of each component before deciding to remove it. In some cases, removing certain components can lead to unintended consequences or negative impacts on vehicle performance or emissions compliance.

The fuel pressure solenoid can be purchased from junkyards or online

The fuel pressure solenoid for the 1999 Mitsubishi Eclipse GSX can be purchased from junkyards or online. While some people have reported that it is difficult to find, it is not impossible to source.

For example, one user on DSMtuners.com suggested that "auto zone or the dealer should be a good place to find one", and another user confirmed that they were able to locate one from a dealership in the USA. You can also try online retailers such as eBay, Amazon, or mitsubishiparts.com. One user on DSMtuners.com provided a link to an eBay vendor who claimed to be a warehouse owner, and another user shared a link to the part on mitsubishiparts.com for $45.36.

When purchasing a fuel pressure solenoid, it is important to ensure that you are getting the correct part number for your specific vehicle. For the 1999 Mitsubishi Eclipse GSX, the part number is MD113721. This is the same part number for the 1998 model, and some users have suggested that this part may also fit the 1997 model. However, it is always best to verify compatibility before purchasing.

In addition to purchasing a new fuel pressure solenoid, some users have suggested that it is possible to find them in junkyards. One user on DSMtuners.com stated that they were "sure there are plenty in junkyards". When considering a used part, it is important to inspect the condition and ensure that it is in good working order.

Whether you choose to purchase a new or used fuel pressure solenoid, it is recommended to verify the compatibility of the part with your vehicle and to compare prices from multiple sources before making a purchase.

The fuel pressure solenoid may cause a check engine light to come on

The fuel pressure solenoid in a 1999 Mitsubishi Eclipse GSX may cause the check engine light to come on. This can be due to a faulty solenoid or a problem with the fuel pressure system. In some cases, the issue can be resolved by resetting the ECU, checking vacuum lines, or bypassing the solenoid. However, if the problem persists, it may be necessary to replace the fuel pressure solenoid or upgrade to an aftermarket fuel pressure regulator.

The fuel pressure solenoid plays a crucial role in the fuel system, controlling the fuel pressure during hot engine starts to prevent vapor lock. When the air intake temperature and engine coolant temperature exceed certain thresholds, the solenoid allows outside air into the vacuum hoses to increase fuel pressure and prevent fuel vapour formation. This is particularly important on hot summer days when the engine is turned off for a short period.

It is worth noting that some owners have reported removing the fuel pressure solenoid without experiencing any issues. However, it is generally recommended to consult a mechanic or a professional before making any modifications to the fuel system.

If the check engine light comes on due to a problem with the fuel pressure solenoid, it is important to address the issue promptly. Ignoring the problem can lead to decreased fuel efficiency, rough idling, or other performance issues. In some cases, it may even result in the car failing emissions tests. Therefore, it is advisable to have a qualified mechanic diagnose and repair the issue to ensure the vehicle's optimal performance and fuel efficiency.

To summarise, the fuel pressure solenoid in a 1999 Mitsubishi Eclipse GSX is responsible for regulating fuel pressure during hot starts. A faulty solenoid can trigger the check engine light, indicating a potential issue with the fuel system. While temporary solutions and workarounds exist, consulting a professional for a proper diagnosis and repair is always recommended to ensure the vehicle's reliable and efficient operation.

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