Fuel Pressure Troubles

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Dec 28, 2017 | 07:45 PM

ToolmakerRob

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Fuel Pressure Troubles

Hi Everyone,

I have a 2005 V6 Escape that started stuttering the other day. I managed to get it in the shop and hooked/teed up a pressure gauge just before the fuel rail. I also replaced the filter right away as well. The pressure goes to 55 when the key is turned on but not started. I also hear a clunk in the tank when the key is on.
The pressure goes all over the board but steadily down to 10 psi when I hold the throttle at around 2000 psi and then starts to cough and sputter.
I then replaced the fuel pump and had the exact same symptoms.
Does anyone have any have any suggestions what I should look at next?

Thanks,

Rob

Dec 28, 2017 | 09:19 PM

projectSHO89

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From: St Louis

Did you check to see if the tank is venting as fuel is used? Stick a short length of hose into the fuel filler neck and re-run the same test.

Dec 29, 2017 | 10:06 AM

ToolmakerRob

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Laughing Gas

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Thanks,

I will try the hose in the tank and post my findings.

Rob

Dec 30, 2017 | 05:39 AM

ToolmakerRob

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Laughing Gas

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So I tried the hose in the tank to eliminate the vent question and the fuel pressure is still erratic.

Any suggestions as what to look at next?

Thanks in advance.

Rob

Dec 30, 2017 | 06:58 AM

projectSHO89

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From: St Louis

Use your scan tool to monitor the FRP PID (Fuel Rail Pressure). Compare it to the mechanical gauge reading. The PID should track about 7 psi higher than the mechanical gauge.

Check for leak-down with the mechanical gauge after the key is switched off. This era of Escape was known for injector/PCM problems that require expensive repairs.