Fuel pressure gauge behaving badly - PowerStrokeNation : Ford Powerstroke Diesel Forum
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post #1 of 14 (permalink) Old 06-29-2012, 02:17 PM Thread Starter
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Fuel pressure gauge behaving badly

I have a glowshift FP gauge installed about 2 1/2 years ago. No problems till now. Not all ocations but at idle it shows 61 to 63 psi. When I accelerate the reading bounce upto 100 psi. when I let off. the readings bounce slower and slower (intervals) untill the engine returns to idle, and even then it sometimes will still bounce slower though.
Recently I changed my fuel filters and oil filter with OEM filter (always). I use Rotella T6 and PS for my diesel additive.
The truck drives greal like always and there have been no differance in performance.
I am very anal about my truck. So having this looked at and corrected ASAP is important to me.
Any thoughts to what is causing this and corrective action I may take?
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I hear that Dodge is giving you a puppy with every truck you buy, so you'll never have to walk home alone again.
2007 F250 6.0L PSD Lariat 4X4 - Dieselsite Coolant bypass Filtation -Bilstein Shocks-Blue fuel pressure upgrade spring-Rough Country Duel Steering Stabilizer-Fumoto Oil Drain Valve-HFCM Water Separator Drain Plug Upgrade-ARP studded
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post #2 of 14 (permalink) Old 06-29-2012, 06:53 PM
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Re: Fuel pressure gauge behaving badly

Sounds as if you have a combustion leak entering the fuel system past the injector copper washer and o-ring. Look up "fuel system bubble test". Just a guess but have any injectors been replaced lately or taken loose?
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post #3 of 14 (permalink) Old 07-12-2012, 07:41 PM Thread Starter
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Re: Fuel pressure gauge behaving badly

No. Injectors have not been touched.

Update on my "FP gauge behaving badly". Well I order a new sender. Install it last night. Drove for about 15 min. all seems OK. Steady 64psi. This morning after starting the engine, it read 70psi, and after driving for about 10 minutes the jumping began. Jumping more often during acceleration the during idle. by the time I got home 30 min. later it had stopped and settled on 70psi.
Is there anything to check clean or replace?
I own then SGII and Autoengineuity scantool. Using these two tools is there something to check?
Both Fuel filter and oil filters have been replaced about 300 miles. All OEM.

Please suggest anything. I don't want this engine to develop into something worse.

I have no, none what so ever drivability issues at this time. The truck runs smooth and strong.

I hear that Dodge is giving you a puppy with every truck you buy, so you'll never have to walk home alone again.
2007 F250 6.0L PSD Lariat 4X4 - Dieselsite Coolant bypass Filtation -Bilstein Shocks-Blue fuel pressure upgrade spring-Rough Country Duel Steering Stabilizer-Fumoto Oil Drain Valve-HFCM Water Separator Drain Plug Upgrade-ARP studded
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post #4 of 14 (permalink) Old 07-12-2012, 07:57 PM
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Re: Fuel pressure gauge behaving badly

Quote:
Originally Posted by headviking View Post
I have a glowshift FP gauge installed about 2 1/2 years ago. No problems till now. Not all ocations but at idle it shows 61 to 63 psi. When I accelerate the reading bounce upto 100 psi. when I let off. the readings bounce slower and slower (intervals) untill the engine returns to idle, and even then it sometimes will still bounce slower though.
Recently I changed my fuel filters and oil filter with OEM filter (always). I use Rotella T6 and PS for my diesel additive.
The truck drives greal like always and there have been no differance in performance.
I am very anal about my truck. So having this looked at and corrected ASAP is important to me.
Any thoughts to what is causing this and corrective action I may take?
__________________
Mine did this exact thing after 2 ish years, I also replaced the sender(with no change).
Now it sits on 100psi all the time and it wont change colors anymore either.
I also noticed that it does not do the calibration sweep at start up anymore either.
I am assuming the gauge is fried and needs replaced.
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post #5 of 14 (permalink) Old 07-12-2012, 10:41 PM Thread Starter
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Re: Fuel pressure gauge behaving badly

Just checked. Mine does the calibration sweep and changes color.

Thanks for your input. I am still believing that the gauge is still fried.

I hear that Dodge is giving you a puppy with every truck you buy, so you'll never have to walk home alone again.
2007 F250 6.0L PSD Lariat 4X4 - Dieselsite Coolant bypass Filtation -Bilstein Shocks-Blue fuel pressure upgrade spring-Rough Country Duel Steering Stabilizer-Fumoto Oil Drain Valve-HFCM Water Separator Drain Plug Upgrade-ARP studded
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post #6 of 14 (permalink) Old 07-12-2012, 10:57 PM
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Re: Fuel pressure gauge behaving badly

Quote:
Originally Posted by headviking View Post
Just checked. Mine does the calibration sweep and changes color.

Thanks for your input. I am still believing that the gauge is still fried.
There is a good chance yes.....mine started off with small gliches also then got progressively worse.
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post #7 of 14 (permalink) Old 07-12-2012, 10:59 PM
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Re: Fuel pressure gauge behaving badly

did you use teflon tape on the fittings? my gauge was all jacked up so i took apart all the connections and found a bunch of balled up crap in the sender.

2005 CC FX4...compounds and everything else that goes with em.
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post #8 of 14 (permalink) Old 07-12-2012, 11:11 PM Thread Starter
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Re: Fuel pressure gauge behaving badly

Yes I did and I did clean up all the old teflon tape on all fittings.
Keep it going.

I hear that Dodge is giving you a puppy with every truck you buy, so you'll never have to walk home alone again.
2007 F250 6.0L PSD Lariat 4X4 - Dieselsite Coolant bypass Filtation -Bilstein Shocks-Blue fuel pressure upgrade spring-Rough Country Duel Steering Stabilizer-Fumoto Oil Drain Valve-HFCM Water Separator Drain Plug Upgrade-ARP studded
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post #9 of 14 (permalink) Old 07-12-2012, 11:55 PM
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Re: Fuel pressure gauge behaving badly

look down inside the fittings. i "thought" i cleaned mine out too...

2005 CC FX4...compounds and everything else that goes with em.
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post #10 of 14 (permalink) Old 07-13-2012, 12:37 AM Thread Starter
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Re: Fuel pressure gauge behaving badly

Cleaned it and put compressed air though all fittings from the fuel bowl to the sender.
I have heard about the bubble test has anyone instructions on how this is done?

I hear that Dodge is giving you a puppy with every truck you buy, so you'll never have to walk home alone again.
2007 F250 6.0L PSD Lariat 4X4 - Dieselsite Coolant bypass Filtation -Bilstein Shocks-Blue fuel pressure upgrade spring-Rough Country Duel Steering Stabilizer-Fumoto Oil Drain Valve-HFCM Water Separator Drain Plug Upgrade-ARP studded
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