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Old 10-04-2012, 05:34 PM
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Fuel pressure ?

I've been slowly noticing that my fuel pressure will drop. At first only at WOT and lost 10-15#'s. My FICM programmer came in yesterday and I loaded the 40 tune and drove. Truck drives great and throttle response is awsome--but at WOT it falls on its face--looked up at the gauge and it was at 20#'s So I stopped at NAPA and got one of their pumps, installed it and the same thing. I have a RR from Dozers Diesel--Still uses the stock front lines and filter bowl--caps off the return port and new lines from the rear of the heads to the reg. and back to stock return line. i changed the upper filter as well. Maybe something in the tank restricting it from sucking fuel?? Without the FICM tune it still dips down past 30. Stock injectors---I have had problems with stiction on number 7, but a fresh oil change with T-6 and a bottle of archoil and it has been fine the last couple days. Any thoughts?
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Old 10-04-2012, 05:59 PM
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Have you installed the blue spring update?

Edit: I wasnt paying attention, you have an RR.
Your suction foot, could have failed. How much fuel in your tank when this happens?

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Old 10-05-2012, 02:30 AM
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All the time. Just filled up this morning.
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Old 10-05-2012, 03:07 AM
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Blue spring update. I get 60 -70 psi when i installed the blue spring kit.


Sent from my iPhone where spell check hates me.
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Old 10-08-2012, 04:58 AM
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whats the blue spring update and is it a factory part

Last edited by flpaul; 10-08-2012 at 05:03 AM.
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Old 10-08-2012, 05:14 AM
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Quote:
Originally Posted by flpaul View Post
whats the blue spring update and is it a factory part
Blue spring is an oem updated fuel pressure regulator spring that prevents fuel pressure from dropping below 45 psi. It installs in the fpr located on the side of the secondary fuel filter housing.

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Old 10-08-2012, 05:26 AM
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thank you mine has never been changed and its a 03
it started yesterday where when i get on hwy it acts like it running out of fuel but if i drive around down it doesnt do it
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Old 10-08-2012, 06:22 AM
DBM DBM is offline
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since the return port on the filter is capped off, the blue spring won't help, in fact I think all the factory regulator guts should be removed with this configuration...
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Old 10-08-2012, 06:31 AM
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Quote:
Originally Posted by DBM View Post
since the return port on the filter is capped off, the blue spring won't help, in fact I think all the factory regulator guts should be removed with this configuration...
Not sure what you mean by this? You should do that and let us all know how that works for you?

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Old 10-08-2012, 07:01 AM
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He has a RR kit with an external regulator, the one in the filter unit is not being used thats why the return on the filter unit is capped off. it will cause restriction and it's not needed.
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