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Gotsea

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Reply with quote  #1 
Hi guys, I have one question regarding the high pressure fuel pump, I was reading and old post regarding ph fuel pumps in different models  and a question came to mind, what controls the constant 30 psi pressure, is it the EMM or is it the pump itself? does the pump rums all the time or intermittently? is there a pressure sensor somewhere?  

Thanks cheers 

 

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1994 24 WA Baha
2008 300 HP DPXSC S/N 05228253
15 1/4 X 19 Mirage Plus 47 MPH top end @ 5,750 RPM
32 MPH cruising @ 12.5 g/h
 South Florida
PhilH12

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Reply with quote  #2 
Hey Gotsea!

To the best of my knowledge the pump runs consistently, and there's a pressure regulator.

From my little old 90 SM - "Pressure Regulator  The fuel pressure regulator helps maintain consistent fuel pressure in the fuel system.  Fuel returning from the injectors enters the fuel chamber of the vapor separator through a pressure regulator. The pressure regulator maintains approximately 20 to 30 psi (138 to 207 kPa) of fuel pressure in the high pressure side of the fuel system."

Experts will chime in on yours though.  [wink]

Phil

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20' Weeres fishing pontoon
90 HP E-Tec E90DPLSUM  05184332
Lake Tawakoni, TX - Catfish Capital of Texas
Gotsea

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Reply with quote  #3 
Thanks Phill, hopefully 

Cheers

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1994 24 WA Baha
2008 300 HP DPXSC S/N 05228253
15 1/4 X 19 Mirage Plus 47 MPH top end @ 5,750 RPM
32 MPH cruising @ 12.5 g/h
 South Florida
PhilH12

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Reply with quote  #4 
No problem!  I doubt that yours is too much different.  My thinking is that the technology didn't change too much as far as regulating fuel pressure between '07 and '08 - even between HP's.  I could be way wrong there though.

I've seen on here where a blocked VST filter can raise fuel pressure, so is the regulator before or after the filter?  An interesting question there.  I've had my VST off and top removed, but wasn't looking at pressure regulation at the time.  Actually, I probably wasn't sure what I was looking at inside there, except getting that little filter changed in the nipple.  Didn't really have to remove the VST or the top or bottom to do that either.  A learning experience, but didn't learn all that I could!  [wink]

Happy boating!

Phil

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Always check the Easy Stuff First!
20' Weeres fishing pontoon
90 HP E-Tec E90DPLSUM  05184332
Lake Tawakoni, TX - Catfish Capital of Texas
Gotsea

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Reply with quote  #5 
Well  for what I understand the fuel pressure regulator is a small spring loaded needle at the returned entrance of the VST, my curiosity comes from an  old article   I read regarding swapping fuel pump from an engine to a different  model and explaining that the fuel pressure output from the pump is constant in all the models, is that true?

Thanks guys 

Cheers   

__________________
1994 24 WA Baha
2008 300 HP DPXSC S/N 05228253
15 1/4 X 19 Mirage Plus 47 MPH top end @ 5,750 RPM
32 MPH cruising @ 12.5 g/h
 South Florida
PhilH12

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Posts: 3,491
Reply with quote  #6 
Hmmm...  I would "guess" that it's pretty similar output from all the pumps - 30+ psi or so.  All regulated by that spring loaded needle in 'whatever model' VST.

I did recently see where the injectors themselves then boost it way up before 'firing' into the chambers.  If there's enough psi to get started, we'll finish the job.  [wink]

Phil

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Always check the Easy Stuff First!
20' Weeres fishing pontoon
90 HP E-Tec E90DPLSUM  05184332
Lake Tawakoni, TX - Catfish Capital of Texas
GEB

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Reply with quote  #7 
Quote:
Originally Posted by Gotsea
Well  for what I understand the fuel pressure regulator is a small spring loaded needle at the returned entrance of the VST, my curiosity comes from an  old article   I read regarding swapping fuel pump from an engine to a different  model and explaining that the fuel pressure output from the pump is constant in all the models, is that true?

Thanks guys 

Cheers   


Hi Gotsea,
I’ve checked through my G1 Repair Manuals and they list fuel pressure
E-Tec 15HO through to 90 hp at 20 - 30 psi
E-TEC 115 through to 300 hp at 20 - 35 psi

Hope this helps
GEB

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The learner will not shear the rams.

Gotsea

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Reply with quote  #8 
Thanks GEB, yes you are right the repair manual indicates 30 PSI for my engine, my curiosity was about the PSI pressure " stream  delivery" of the fuel pump, I have a BRP OME fuel pump  that I took from my engine due to a hair crack, I repair it and kept  it as an emergency spare, I rigged the pump to a 12 v source, put it on a fuel container  and pair it to a fuel pressure gauge (no pressure regulator) the fuel pressure reached 100 + PSI before the pump  stopped due to overload, as soon as I release the pressure it started working again, I could keep the pressure any where from 10 to 80 PSI depending on how much I open the release valve on the fuel pressure gauge, interesting experiment, that answers my curiosity, the fuel pump is simple minded the pressure regulator is the one that maintains the adequate pressure, not a great discovery by any means but answers a hole lot of other doubts in that respect. thank you for all the input 

Cheers guys  

__________________
1994 24 WA Baha
2008 300 HP DPXSC S/N 05228253
15 1/4 X 19 Mirage Plus 47 MPH top end @ 5,750 RPM
32 MPH cruising @ 12.5 g/h
 South Florida
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