2005 jeep grand cherokee 3.7 fuel pressure

The fuel filter in the 2005 Jeep Grand Cherokee with the 3.7L engine is located in the gas tank on the driver's side of the SUV. This fitler is part of the fuel sending unit that includes the pump and the level sensor. The fuel filter in Your car has the job of removing the sediment from the fuel so that it does not wind up in the lines or the injectors. If You notice that Your fuel pressure is lower than average it could be a sign of a problem with the filter. To replace the filter You will need to buy an entirely new assembly. They used to have separate filters, but they found them to be weak points where leaks would develop.

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Betty F July 16, 2020

You'll find the fuel filter on your 2005 jeep grand cherokee 3.7 In front of your gas tank on the driver's side of the vehicle.

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I found this interesting in the first article, "When an engine is hot, and turned off, the fuel that is in the lines and injectors must be kept under pressure to prevent vapor lock. If the pressure drops, the fuel turn from liquid to a gas (vapor) then the fuel pump cannot pump the fuel when trying to start. Have the residual fuel pressure checked."

I now have 403,000 miles on my engine, and just replaced the fuel pump and injectors. I will soon find out if this fixed that problem when I run my first tank of ethanol gas soon.

This might not be an "ethanol" problem, and could have been a fuel pressure problem, but ethanol does have a lower boiling point than regular gas if I remember correctly. So maybe I just experience it with the ethanol gas.

This engine does not have a return fuel line, but after inspecting the fuel rail when I replaced the injectors I found that the fuel enters the drivers side of the rail, and then crosses over to the passenger side. The holes for the injectors on the drivers side are larger diameter than on the passenger side. Also noticed on the passenger side, it looks like there is a baffle in that side that runs the length of the passenger side basically splitting the fuel rail on that side to an upper and lower side, and the baffle has springs between it and the inside bottom of the rail.

As I look back on my previous post from about 80,000 miles ago, I was averaging 15 mpg, but lately I have been averaging 13 mpg, this is why I decided to replace the injectors and clean the injector ports on the heads. Upon doing all this I also noticed that I was only running 35 psi on the rail and at the tank, so I also replaced the fuel pump.

I have only put 150 miles on it since all the work I just did to it, that I posted on another thread. I will be getting it back on the road probably Friday after I finish detailing it. Then will be able to test my ethanol theory.

What psi should my fuel pressure be?

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What should the fuel pressure reading?