Increasingly high fuel pressure
Thread Starter
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Tuned
Joined: Nov 2010
Posts: 251
Likes: 6
Increasingly high fuel pressure
My fuel pressure has been slowly increasing over the last few hundred miles. Normally, it runs around 55 PSI but start creeping up slowly and steadily and is now close to 95 PSI. My first thought was a clogged fuel filter, but its only 15k miles old. Any ideas?
9 ECHO 1
Joined: Aug 2009
Posts: 12,467
Likes: 58
From: Missouri
This
And this.
Although the second is more important. Prefilter sensor will indicate clogged filter. Post filter probably a blockage somewhere more expensive.
And this.
Although the second is more important. Prefilter sensor will indicate clogged filter. Post filter probably a blockage somewhere more expensive.
Posting Guru
Joined: Mar 2011
Posts: 1,037
Likes: 0
From: Florida
Like Greg says an FPR rebuild kit might solve it. F350-6 found that a bad poppet guide o-ring was the cause of his high fuel pressure. This o-ring is part of the rebuild kit.
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Senior User
Joined: Jun 2010
Posts: 323
Likes: 0
From: Victor Harbor South Aust
SENDER UNIT??
Could possibly be your ISSPRO Sender unit.
This increase in fuel pressure happened to my truck and after going over everthing I found the ISSPRO Sender unit to be the culprit. Got Clay to send replace ment and bingo all good.
Same thing has happened again and Clay is sending another.
It appears that ISSPRO have had a batch of faulty Sender Units and is trying to weed them out and dealing with their supplier.
I started a thread on this at begining of this month "FUEL PRESS SENDER UNIT? . It's on page 13 at present.
Go check that thread and you'll see a lot of issues from others on the ISSPRO Sender units causing increased high fuel pressure.
Not saying this is definately your cause, but it might be just that??
Cheers.
Reg
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Thread Starter
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Tuned
Joined: Nov 2010
Posts: 251
Likes: 6
G'day Nitro,
Could possibly be your ISSPRO Sender unit.
This increase in fuel pressure happened to my truck and after going over everthing I found the ISSPRO Sender unit to be the culprit. Got Clay to send replace ment and bingo all good.
Same thing has happened again and Clay is sending another.
It appears that ISSPRO have had a batch of faulty Sender Units and is trying to weed them out and dealing with their supplier.
I started a thread on this at begining of this month "FUEL PRESS SENDER UNIT? . It's on page 13 at present.
Go check that thread and you'll see a lot of issues from others on the ISSPRO Sender units causing increased high fuel pressure.
Not saying this is definately your cause, but it might be just that??
Cheers.
Reg
Could possibly be your ISSPRO Sender unit.
This increase in fuel pressure happened to my truck and after going over everthing I found the ISSPRO Sender unit to be the culprit. Got Clay to send replace ment and bingo all good.
Same thing has happened again and Clay is sending another.
It appears that ISSPRO have had a batch of faulty Sender Units and is trying to weed them out and dealing with their supplier.
I started a thread on this at begining of this month "FUEL PRESS SENDER UNIT? . It's on page 13 at present.
Go check that thread and you'll see a lot of issues from others on the ISSPRO Sender units causing increased high fuel pressure.
Not saying this is definately your cause, but it might be just that??
Cheers.
Reg
Posting Guru
Joined: Mar 2011
Posts: 1,037
Likes: 0
From: Florida
The dieselorings bowl rebuild instructions has all the steps for the FPR: http://www.dieselorings.com/docs/FuelBowlRebuild.pdf
Just use a socket to push out the old poppet guide by hand. Use the new poppet guide to identify the correct socket size.
Just use a socket to push out the old poppet guide by hand. Use the new poppet guide to identify the correct socket size.
Thread Starter
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Tuned
Joined: Nov 2010
Posts: 251
Likes: 6
Well I did the FPR rebuild this weekend, all went smoothly. The only problem is... it didnt fix the problem. I either still have high fuel pressure, or my gauge is lying to me. I'm guessing my gauge is the culprit as I've had issues with my other ISSPRO gauges too.
Anything else to check or another way of confirming high fuel pressure (besides installing a manual gauge)?
Anything else to check or another way of confirming high fuel pressure (besides installing a manual gauge)?
Senior User
Joined: Jun 2010
Posts: 323
Likes: 0
From: Victor Harbor South Aust
BOOST & FUEL SAME CONNECTORS
Well I did the FPR rebuild this weekend, all went smoothly. The only problem is... it didnt fix the problem. I either still have high fuel pressure, or my gauge is lying to me. I'm guessing my gauge is the culprit as I've had issues with my other ISSPRO gauges too.
Anything else to check or another way of confirming high fuel pressure (besides installing a manual gauge)?
Anything else to check or another way of confirming high fuel pressure (besides installing a manual gauge)?
To check if the ISSPRO guage your using for fuel pressure is alright.
The Boost & Fuel pressure use the same connectors, so unplug the wiring off the Boost Sender unit and unplug the wiring off your fuel press sender and plug it onto your Boost sender unit.
Your fuel press guage should read normal Boost if it is ok
.Don't try it the other way around unless your Boost guage is a 0 - 100psi. (I'm guessing it is 0 - 30psi).
I did this as part my fault finding. Helped narrow it down to the fuel pressure unit being the cause of high fuel pressure reading.
Worth a try M8.
Cheers,
Reg
Molon Labe
Joined: Dec 2006
Posts: 5,272
Likes: 1
From: Alaska
Well I did the FPR rebuild this weekend, all went smoothly. The only problem is... it didnt fix the problem. I either still have high fuel pressure, or my gauge is lying to me. I'm guessing my gauge is the culprit as I've had issues with my other ISSPRO gauges too.
Anything else to check or another way of confirming high fuel pressure (besides installing a manual gauge)?
Anything else to check or another way of confirming high fuel pressure (besides installing a manual gauge)?
Cargo Master
Joined: Oct 2011
Posts: 2,883
Likes: 776
From: SoCal/Wyoming
I am having similar issues; however, I sent off for a new sending unit and my pressure is still 100psi. My next option is to build a gauge and see what my bowl pressure is compared to the ISSPRO gauge. I have a strong suspicion that the FRx spring may be the culprit but I am not sure and don’t have enough spare time to get that deep into a new project right now.