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04-26-2011, 03:11 PM
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CC Member
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Join Date: Mar 2011
Cobra Make, Engine: #6101 streetbeast Ingelese stack EFI 351w/t-5 9" 4link 3.55
Posts: 277
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fuel psi gage
Where to mount fuel psi gage? Engine compartment or cockpit? 
Thanks, Little Wave... |
04-26-2011, 03:13 PM
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Senior Club Cobra Member
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Join Date: Sep 2000
Location: Holderness, NH, US of A,
NH
Cobra Make, Engine: CSX 4772 old iron FE
Posts: 5,499
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Comp cars had them in the dash. Modern install transmits pressure through an isolator so you don't have pressurised fuel into the cockpit.
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04-26-2011, 03:44 PM
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CC Member
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Join Date: Oct 2003
Location: Queen Creek,
AZ
Cobra Make, Engine: Midstates, Vette suspension, Baer 6P brakes, 540 cid Chevy, Haltech Fuel Injection
Posts: 906
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Since you are going EFI, you'll need a hi-pressure gage.
I did mine EFI in 1995, the gage offerings were nonexistant, so I used (and still use) an oil pressure sending unit (measures 50 psi just fine) and route the wires to the gage in the dash.
Do not run gas into the passenger compartment.
These days, I bet you can find a real fuel pressure gage for hi-pressure. If it is not electric or isolated, put it outside the passenger compartment.
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E. Wood
ItBites
10.69 @ 129.83mph - on pump gas and street tires
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04-26-2011, 04:00 PM
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CC Member
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Join Date: Mar 2011
Cobra Make, Engine: #6101 streetbeast Ingelese stack EFI 351w/t-5 9" 4link 3.55
Posts: 277
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Thanks for the info ItBites, i will look into it futher. I think I would rather have it in the engine compartment because of gage placement.
Here is a question. What is the fule psi gage for? Is it just to tell you psi?, or can you use it to help monitor other components such as oxygen sensor,lean or richness of fuel, ect. ect.. or all these. If so would it be better to place it in the cockpit?
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04-26-2011, 05:03 PM
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CC Member
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Join Date: Oct 2003
Location: Queen Creek,
AZ
Cobra Make, Engine: Midstates, Vette suspension, Baer 6P brakes, 540 cid Chevy, Haltech Fuel Injection
Posts: 906
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I use mine for diagnostics while driving. If it burps in a corner, I can see the pressure drop for an instant and know I uncovered the pickup (and know to leave more gas in the tank). I can also tell the health of my pump (I've killed two). When the pressure doesnt jump right up at the key turn, I know the pump is on its way out... I have a vaccuum reference regulator, so I can also verify at a glance the regulator is responding to different vaccuum conditions. If my data logger starts telling me we are having lean conditions, I can monitor the pressure to verify the lean requires a map change vs the pump getting weak (keeps me from screwing up a perfectly good fuel map to cover for a pump growing weak). That sort of stuff.
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E. Wood
ItBites
10.69 @ 129.83mph - on pump gas and street tires
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04-26-2011, 05:24 PM
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CC Member
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Join Date: Mar 2002
Location: MELBOURNE,AUSTRALIA,
Vic
Cobra Make, Engine: Homebush,B2 Windsor 445
Posts: 1,189
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Quote:
Originally Posted by ItBites
Do not run gas into the passenger compartment.
If it is not electric or isolated, put it outside the passenger compartment.
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littlewave,
I don't know if I'm mis-Interpreting you or your Questions???
You should really take NOTICE of the ABOVE STATEMENTS!!!!!
__________________
They shall not grow old as we who are left grow old. Age shall not weary them, nor the years condemn. At the going down of the sun and in the morning, We will remember them ....
And in the end, it's not the years in your life that count. It's the life in your years- Abraham Lincoln 
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04-26-2011, 05:47 PM
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CC Member
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Join Date: Mar 2011
Cobra Make, Engine: #6101 streetbeast Ingelese stack EFI 351w/t-5 9" 4link 3.55
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Quote:
Originally Posted by OZCOBRA
littlewave,
I don't know if I'm mis-Interpreting you or your Questions???
You should really take NOTICE of the ABOVE STATEMENTS!!!!! |
OZCOBRA , I guess my question is, is a fuel psi gage impotant to monitor with an efi system? |
04-26-2011, 10:37 PM
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CC Member
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Join Date: Mar 2002
Location: MELBOURNE,AUSTRALIA,
Vic
Cobra Make, Engine: Homebush,B2 Windsor 445
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Quote:
Originally Posted by ItBites
I use mine for diagnostics while driving. If it burps in a corner, I can see the pressure drop for an instant and know I uncovered the pickup (and know to leave more gas in the tank). I can also tell the health of my pump (I've killed two). When the pressure doesnt jump right up at the key turn, I know the pump is on its way out... I have a vaccuum reference regulator, so I can also verify at a glance the regulator is responding to different vaccuum conditions. If my data logger starts telling me we are having lean conditions, I can monitor the pressure to verify the lean requires a map change vs the pump getting weak (keeps me from screwing up a perfectly good fuel map to cover for a pump growing weak). That sort of stuff.
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littlewave,
In answer to your question below ,If you use it as above a great tool.
Quote:
Originally Posted by littlewave
OZCOBRA , I guess my question is, is a fuel psi gage impotant to monitor with an efi system?
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....and yes great to check at a quick glance as fuel pressure is an important function with EFI .....
__________________
They shall not grow old as we who are left grow old. Age shall not weary them, nor the years condemn. At the going down of the sun and in the morning, We will remember them ....
And in the end, it's not the years in your life that count. It's the life in your years- Abraham Lincoln
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04-27-2011, 05:22 AM
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Join Date: Nov 2001
Location: Windham,,
Me
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Only time I need to know about fuel pressure is when setting it,so left mine near carb in fuel line.Did think about putting it dash!
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04-27-2011, 06:27 AM
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CC Member
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Join Date: Mar 2011
Cobra Make, Engine: #6101 streetbeast Ingelese stack EFI 351w/t-5 9" 4link 3.55
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Ok guys, Thanks for your time.
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04-27-2011, 08:51 AM
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Senior Club Cobra Member
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Join Date: Jun 2003
Location: West Linn,
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Cobra Make, Engine: ERA #684, 428 FE, TKO600
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Most fuel pressure regulators used on EFI systems have a port for a pressure gauge on them to set up the system. Once I got my system set up the only time I reference it is when I'm working on the system so it stays connected to the regulator under the hood. If you want to monitor fuel pressure while running follow the advice given about not running a wet gauge for fuel in the cockpit.
DonC
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04-27-2011, 07:08 PM
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CC Member
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Join Date: Mar 2011
Cobra Make, Engine: #6101 streetbeast Ingelese stack EFI 351w/t-5 9" 4link 3.55
Posts: 277
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Right on Don I will take that advice.
Quote:
Originally Posted by DonC
Most fuel pressure regulators used on EFI systems have a port for a pressure gauge on them to set up the system. Once I got my system set up the only time I reference it is when I'm working on the system so it stays connected to the regulator under the hood. If you want to monitor fuel pressure while running follow the advice given about not running a wet gauge for fuel in the cockpit.
DonC
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04-28-2011, 10:44 AM
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Join Date: Feb 2000
Location: Neverland,
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Cobra Make, Engine:
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I had Webbers on mine and put the fuel pressure gauge under the hood in-line on one side and the NOS gauge on the other side. The only time I needed it was when adjusting the settings and I really did not want to take the extra chance of having fuel in the passenger compartment should something go wrong.
Put a high volume fuel pump in a car and in an accident if the line gets busted your toast... literally. Something to think about.
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Steve
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