Fuel pressure testing
06-19-2020, (Subject: Fuel pressure testing ) 
Post: #1
Fuel pressure testing
./uploads/202006/post_1778_1592604520_0533aa4133c3157489419eef11b6a691.jpegMay be a dumb question, but...
There are two sets of specifications. One for WITH EGR. The other WITHOUT EGR. If someone has an 871 where egr is just for looks, which specs do they use?
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06-19-2020, (Subject: Fuel pressure testing ) 
Post: #2
RE: Fuel pressure testing
275-300 on 871


User's Signature: 2010 Lonestar - CM871 - 13sp - 3.70s, 2016 T680 - cm2350 - 13sp - 3.36s - skateboarder
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06-19-2020, (Subject: Fuel pressure testing ) 
Post: #3
RE: Fuel pressure testing
(06-19-2020 )Lonestar10 Wrote:  275-300 on 871


Mine is at the low end of that. But it stops at 1900 rpm. I don’t know if that would matter. I could raise that, but I didn’t.
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06-19-2020, (Subject: Fuel pressure testing ) 
Post: #4
RE: Fuel pressure testing
my 871 ran in the low mid 280s at full chooch.


User's Signature: 2010 Lonestar - CM871 - 13sp - 3.70s, 2016 T680 - cm2350 - 13sp - 3.36s - skateboarder
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 Thanks given by: Mrkentee
06-20-2020, (Subject: Fuel pressure testing ) 
Post: #5
RE: Fuel pressure testing
The test says 2100 rpm. I guess mine is governed at 1900. Would the extra 200 rpm bring the pressure up a noticeable amount? It was right about at the low end of the spec. The needle was jumping a bit.
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06-21-2020, (Subject: Fuel pressure testing ) 
Post: #6
RE: Fuel pressure testing
If needles bouncing a bunch you might be getting a small amount of air in system


User's Signature: 2010 Lonestar - CM871 - 13sp - 3.70s, 2016 T680 - cm2350 - 13sp - 3.36s - skateboarder
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06-22-2020, (Subject: Fuel pressure testing ) 
Post: #7
RE: Fuel pressure testing
Fuel pressure test gauge fluttering.
Steady 22-24 psi with lift pump.
I isolated each tank by closing the valve on top-no difference.
Is this the pump? It has 1,080,000 miles. How long are these expected to last? And what about the shut-off valve?
Truck seems to run fine.
https://youtu.be/5r60FFOHs7I
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06-22-2020, (Subject: Fuel pressure testing ) 
Post: #8
RE: Fuel pressure testing
If the pressure is within specs and it starts/runs fine then the gear pump is OK.

What problem are you trying to solve here?
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 Thanks given by: Rawze , Mrkentee
06-23-2020, (Subject: Fuel pressure testing ) 
Post: #9
RE: Fuel pressure testing
(06-22-2020 )Signature620 Wrote:  If the pressure is within specs and it starts/runs fine then the gear pump is OK.

What problem are you trying to solve here?

I had 3 momentary low pressure cel’s at very low speeds about 100 hours apart. I replaced the fuel pressure sensor. Last week I had 2 momentary pressure differential cel’s in the same day.
Haven’t had any since. Just trying to find a problem before I get stuck somewhere. Thinking maybe pump is acting up. Possibly pressure regulators, or shut off valve??
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