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-   -   fuel psi gage (http://www.clubcobra.com/forums/all-cobra-talk/110343-fuel-psi-gage.html)

littlewave 04-26-2011 03:11 PM
fuel psi gage
 
Where to mount fuel psi gage? Engine compartment or cockpit?:confused:

Thanks, Little Wave...

mickmate 04-26-2011 03:13 PM
Comp cars had them in the dash. Modern install transmits pressure through an isolator so you don't have pressurised fuel into the cockpit.

ItBites 04-26-2011 03:44 PM
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.

littlewave 04-26-2011 04:00 PM
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?

ItBites 04-26-2011 05:03 PM
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.

OZCOBRA 04-26-2011 05:24 PM
Quote:
Originally Posted by ItBites (Post 1125241)

Do not run gas into the passenger compartment.

If it is not electric or isolated, put it outside the passenger compartment.
littlewave,

I don't know if I'm mis-Interpreting you or your Questions???:confused:

You should really take NOTICE of the ABOVE STATEMENTS!!!!!

littlewave 04-26-2011 05:47 PM
Quote:
Originally Posted by OZCOBRA (Post 1125264)
littlewave,

I don't know if I'm mis-Interpreting you or your Questions???:confused:

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?

OZCOBRA 04-26-2011 10:37 PM
Quote:
Originally Posted by ItBites (Post 1125261)
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.
littlewave,

In answer to your question below ,If you use it as above a great tool.

Quote:
Originally Posted by littlewave (Post 1125275)
OZCOBRA , I guess my question is, is a fuel psi gage impotant to monitor with an efi system?
....and yes great to check at a quick glance as fuel pressure is an important function with EFI .....

mdross1 04-27-2011 05:22 AM
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!

littlewave 04-27-2011 06:27 AM
Ok guys, Thanks for your time.

DonC 04-27-2011 08:51 AM
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

littlewave 04-27-2011 07:08 PM
Right on Don I will take that advice.
Quote:
Originally Posted by DonC (Post 1125377)
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

4RE KLR 04-28-2011 10:44 AM
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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