I have seen lots of 7.3 Ford Powerstroke trucks suffering from low or inconsistent fuel pressure.
That can cause power loss, running issues, EGT problems, and excessive smoke.
So, I have listed and described 7.3 Powerstroke low fuel pressure symptoms to help you notice it as soon as possible and take action.
Signs of 7.3 Powerstroke Low Fuel Pressure
Missed ignition, rough running, too much vibration, and low power are the signs of low fuel pressure in the 7.3 Powerstroke engine.
But those need some clarification because lots of other factors cause those issues too.
Let me explain them in the following part.
7.3 Powerstroke Low Fuel Pressure Symptoms:
Among lots of symptoms, let me explain some of the most common and obvious ones. It can help you figure out how to detect 7.3 Powerstroke low fuel pressure.
1. Low PSI Reading
Under the hood, your truck may have a fuel pressure gauge. If not, install one immediately.
It will tell you whenever you suspect that the engine is not running the same as it is supposed to.
The gauge shows low pressure without failing. So, keeping an eye on the pressure gauge can give you the most obvious sign in case there is any problem.
2. Rough Idling
One 7.3 Powerstroke owner mentioned that he experienced intermittent rough idling sometimes.
The engine had hiccups so bad, it seemed that the truck is about to die. Most of the time, the engine started fine with a smooth idle.
But the problem occurred on the way back home. To summarize, having rough idling, you can suspect and diagnose targeting low fuel pressure.
3. Loss of Power
After running the truck for a while, one may experience a loss of power all of a sudden.
The dashboard showing low fuel signs, slow rev, poor running are the common symptoms of it.
Even after changing the tank and changing the fuel filter, the issue may persist.
Therefore, it requires a thorough checkup done by a professional in a servicing shop.
4. Shifting Problem
Those who are seeing fluctuations in the fuel pressure level may experience another problem.
One owner complained that he could not shift into a second until the OD light turns on. Then, he could do it manually.
With low pressure, it seemed like the transmission was slowly dying.
Furthermore, the engine can die without giving any warning codes or turning on alarm lights on the dashboard.
5. Too Much Vibration
Another symptom of low fuel pressure is too much vibration than usual.
It happens due to improper combustion. As the fuel injectors become incapable of sending enough fuel in the cylinder, misfires happen.
The engine tries harder to run; thus, consuming more fuel. As a result, the fuel economy gets decreased greatly. You can consider it as a symptom too.
6. Hesitant Acceleration
Another symptom of the mentioned situation is having a problematic acceleration after a few minutes from starting the engine.
Some said that they saw 0 PSI even at moderate acceleration.
Pro Tip: Never ever use your bare fingers to check fuel leaks. Because high-pressure fuel can even take your life in extreme cases.
Reason For Low Fuel Pressure On 7.3 Powerstroke : Cold Weather
According to some people, the symptoms of low fuel pressure can occur in cold weather conditions.
It gets down to 40 PSI or lower when the engine is cold. Also, the gauge bounces all over the place.
But the problem goes away when the engine runs for a while and gets warmed up.
As the heater in the fuel pump takes some time to start working, you can face this issue.
An interesting fact is that some 7.3 Powerstroke owners experienced something completely opposite of what I have just told you.
They saw a drop in the fuel pressure whenever the engine’s temperature rises above a certain level.
The problem goes away whenever it gets cooled down.
What to Do When You Detect 7.3 Powerstroke Low Fuel Pressure?
The question arises once you have detected the problem. So, installing a pressure gauge on the fuel line is required here.
In this article, there is a detailed guide with images describing the installation process.
Now, run the engine and see whether the gauge shows above 50 or 60 PSI pressure.
Sometimes, you may see dropping the pressure and increasing it immediately.
In any case, take the truck to your mechanic for a thorough check. Step by step troubleshooting can only find out the faulty parts. Then, replace or repair them.
However, using some special tools, you can do it by yourself at home. Here’s a YouTube video link that shows how to do it properly.
Is Fixing 7.3 Powerstroke Low Fuel Pressure Expensive?
Whether the solution is expensive or not depends on the severity of it. Some parts cost around 20 bucks and some way more.
Once your mechanic has found out the cause of the problem, you can estimate the expense.
Some 7.3 Powerstroke owners mentioned that it took between $7000 up to $11000 to solve the problem.
So, better call your insurance company on the matter.
How Often Should You Inspect 7.3 Powerstroke Low Fuel Pressure?
You would be glad to know that there is a “fuel delivery pressure switch” for observing fuel supply pressure.
It not only protects the high-pressure pump suffering from low fuel pressure but also helps you point in the right direction for troubleshooting.
In case the pressure dropping below the required rate for more than a minute, the PCM gets notified. And, a warning sign appears on the dashboard.
This is when you have to service the parts related to its mechanism.
Low fuel pressure is a common problem across different Ford motor vehicles. It happens for various reasons ranging from debris build-up to faulty gauge.
Knowing the 7.3 Powerstroke low fuel pressure symptoms can help you fix the issue avoiding more damage to other parts of the engine.