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Old 03-10-2013, 03:35 PM   #1
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Fuel rail high pressure

Hello

Been testing this problem for a couple of days now. Tested the fuel pressure and its way high! Allmost 70. i replaced the fuel pressure regulator thinking this was the culprit but it's still testing the same. Check for a kinked or blocked fuel return line and it doesn't appear to be. Also having issue where it won't start right away but if you turn on the key and wait 10 minutes if fires right up seems to run fine with the high pressure. I thought I was having a possible problem with my fuel pump but I jumped the relay and I can hear the fuel pump kick on. Also I waited about a half-hour and according to the gauge it only dropped about 14 psi which according to the repair manual tells me that it's not a problem of fuel leaking back down into the gas tank. My main concern is the fuel pressure in the rail at the moment I'm wondering if I have a bad fuel injector or if my gauge is not reading correctly.

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Old 03-10-2013, 04:47 PM   #2
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Is the vacuum line to the fuel regulator hooked up and have vacuum to it?

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Old 03-10-2013, 05:14 PM   #3
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Quote:
Originally Posted by Redrider94 View Post
Is the vacuum line to the fuel regulator hooked up and have vacuum to it?
yes ive disconnected it and no change. I can hear it sucking air when i dissconnect it. Im thinkng i have a partially blocked return line but i dont know where. Im probably Going to replace the fuel pump even though there's really no indication at this point that I have a fuel pump problem other than having to turn the key on and wait 10 minutes and then start. I can start it every time like that. I did read on another Forum that at the rear crossmember just before the line goes into the gas tank it can rust and constrict the line there.
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Old 03-10-2013, 05:32 PM   #4
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hi yes as far as i know im getting vacume. changed the feul filter new fuel regulator and checked the lines for blockage. Guess ill have to remove the return line comletely to make sure. I read the sometimes get blocked where they go into the tank or at the pump. Dont really want to but i guess ill remove the tank and pump and see whats what. I still think even though the gauge didnt confirm it that tha fuel is leaking back into the tank. If i turn the key it wont start. but if i turn the key on for ten or so minutes it will fire right up. Its like it has to build pressure slowly but i dont know for sure. Im allmost to the point im gonna take it to a professional.
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Old 03-10-2013, 06:27 PM   #5
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I had the same problem, was getting 64 pounds. Took the fuel tank down and the return line was getting pinched between the tank and a cross member on the body. I just pulled it away taped it and put the tank back on. Never had a problem since.
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Old 03-10-2013, 06:48 PM   #6
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Yeah thats what I think is going on. Insted of dropping the tank Ill see If I can break the line somewhere and attach a rubber hose and see if that drops the pressure before dropping the tank. hate messing with gasoline.
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Old 03-10-2013, 08:48 PM   #7
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yeah i know the feeling. Just make sure you don't have very much gas in it if you do drop the tank, makes life a lot easier. It's only 7 or 8 bolts plus you have to unhook the filler nozzle. It's really not that bad
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Old 03-10-2013, 09:34 PM   #8
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yes, it's the return hose is pinched where it goes between the body and subframe right before the tank, if thats not it, pull the tank and the fuel pump assembly, and check the return hose where it drops to the bottom of the tank. if someone dropped the tank before, and used a jack, or if you hit something, where the bottom of the tank is pushed up just slightly, it will push against the return hose and block it, causing high fuel pressure.

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