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Old 04-14-2013, 10:29 AM
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HELP, blue spring low FP

I have an 03 6.0 and was getting 50psi at idle, ~42psi WOT. So I put in the blue sring upgrade. At first it gave me 58-59 at idle and 50 WOT. Its been a few days now and and Idle psi has settled at 55. At seemingly random times, driving or idle, fuel pressure will drop sharply as low as 39psi for a few seconds before returning to normal. Ive looked it over and see no signs of fuel leeks around the fuel pressure regulator. Can you guys help me out on this?
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Old 04-14-2013, 01:09 PM
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Gauge, pump or?
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Old 04-14-2013, 01:38 PM
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How old are the fuel filters ??
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Old 04-14-2013, 01:52 PM
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Im getting the readings from the fuel pressure test port in the pressure regulator housing via my edge CTS. the fuel filters are only 4,000 miles/ 6 months old
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Old 04-14-2013, 02:29 PM
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You may need a new fuel pump. Not sure if your year tank has the filters in it but that is a possibilty.
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Old 04-14-2013, 03:24 PM
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I does have a filter in it, It seams like its got something to do with the blue spring upgrade, the sharp drops at least. I havnt seen it drop so low so fast before I put it in....
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Old 04-14-2013, 07:04 PM
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You may have to check that all the pieces are installed and in good shape.

FWIW, I had a bad (short) blue spring. It was slightly shorter than my stock one I removed. When I started it up, I was 10 psi lower than the stock one. I stretched the stock one and put it back in while I waited for the new one to show up. I also ordered a $15 similar one off eBay. It runs at 80psi, just 6 above my new blue one, but less than 1/2 the price.

As well, after all the BS with this, I just removed the 4 cap screws and left everything else hooked up to swap out the springs. I just removed the CAC at the intake to make it easier to get at the screws.
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Old 04-14-2013, 07:12 PM
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Quote:
Originally Posted by twoicebergs View Post
You may have to check that all the pieces are installed and in good shape.

FWIW, I had a bad (short) blue spring. It was slightly shorter than my stock one I removed. When I started it up, I was 10 psi lower than the stock one. I stretched the stock one and put it back in while I waited for the new one to show up. I also ordered a $15 similar one off eBay. It runs at 80psi, just 6 above my new blue one, but less than 1/2 the price.

As well, after all the BS with this, I just removed the 4 cap screws and left everything else hooked up to swap out the springs. I just removed the CAC at the intake to make it easier to get at the screws.
80 PSI??? holy crap

Last edited by sprksonu; 04-14-2013 at 07:17 PM.
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Old 04-15-2013, 06:59 AM
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Quote:
Originally Posted by twoicebergs View Post
You may have to check that all the pieces are installed and in good shape.

FWIW, I had a bad (short) blue spring. It was slightly shorter than my stock one I removed. When I started it up, I was 10 psi lower than the stock one. I stretched the stock one and put it back in while I waited for the new one to show up. I also ordered a $15 similar one off eBay. It runs at 80psi, just 6 above my new blue one, but less than 1/2 the price.

As well, after all the BS with this, I just removed the 4 cap screws and left everything else hooked up to swap out the springs. I just removed the CAC at the intake to make it easier to get at the screws.
I thought anything over 75 PSI puts you in danger of blowing injector o-rings. Dont remember where I heard that, but correct me if I'm wrong. Are you still running this 80 PSI spring?

To the OP, you possibly have a weak pump, something is clogging the pick-up, or your pick-up is sucking air. Whats the fuel level in the tank when you notice the sudden drops in pressure?
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Old 04-15-2013, 07:40 AM
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You know I thought about that today, Im just below a quarter tank and I dont usually let it get that low. Im going to fill up later today and see if that helps
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blue spring, erratic fuel pressure, fuel pressure, low fuel pressure

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