I recently purchased the B&M adj. fpr, along with a B&M fp gauge. I was wondering where i can install the gauge? i found a link https://honda-tech.com/forums/acura-integra-6/b-m-fuel-pressure-gauge-install-2612970/ but thats at the filter, shouldnt the gauge be placed after the fpr, otherwise you are just getting the pressure the pump is pushing before the pump. or does this not matter? Also, can the gauge be installed on the stock rail? (i dont have the car here its at home and i cannot look right now, and if i need to get a new rail, then i need to orxer it before i go home this weekend) any help thanks

 

You want to see the pressure in your feed line.
Common mounting locations would on the fuel rail or on the fuel filter.
This tells you how much pressure exists between the fuel pump and the injectors.
(What is being applied at the injector is what you care about.)

If you were to mount it on the other side of the regulator then you would be reading the pressure in the fuel return line... this would tell you nothing other than how much pressure exists in the fuel being returned to the fuel tank from the regulator.


You can install it on some stock rails
for instance, the Z6 rail has a cap on the end of it that you can remove and then tap threads into the rail for your gauge.
You can also put some fittings together like this B16 rail
http://www.hondamarketplace.com/show....php?t=2296338

 

yes but i thought mounting it on the filter which is before the fpr would only tell what the pump is pushing before it is pressured down. Shouldnt it always be mounted right after the fpr? and does the stock rail have a place where i can screw in the gauge?

 

It will tell what the pump is pushing.
That's what you want to know - how much pressure is the pump pushing to the injectors.
If you mount it on the fuel filter then put it on the EXIT side (going to the rail) so you do not see any additional pressure created from the filter itself.
If you mount it on the WRONG side (INLET from the pump and going into the filter) and you filter starts gets dirty and clogged, then you will see a jump in pressure that isn't 'real'. The pressure going to the injectors (the important pressure) will NOT be the same as what the improperly mounted gauge reads.

NO (again)
If you mount it AFTER the FPR then you will be mounting it to your return line.
There isn't any other place AFTER your FPR.... it's the return line ONLY.
You don't care how much pressure is in the line going from your FPR back to the gas tank, do you?

Already answered that in the previous post.
More clarity - NO!
You will have to get additional fittings and/or modify the rail.

 

but if i put it before the fpr i wont be able to see what i am ajdusting the regulator to will I? by after the fpr i meant like right after or on the fuel rail.i need to adjust the pressure down and putting the gauge before the regulator. I want to read the pressure after it has been regulated before it goes to the injectors, and no i do not care about the pressure going back to the tank. My question is if i put it on the filter i wont be able to see the ajustments made to the pressure because it is not regulated down until after it passes through the fpr. So to do this i will need a new fuel rail correct?

 

Anywhere between the outlet of the fuel filter to before the FPR.
The regulator will have done it's job anywhere in that loop.

Fuel does not pass through the FPR to become regulated.
If the pressure is too high, the FPR opens up and releases the pressure back into the fuel tank.

 

ok so putting it on the filter and then adjusting the fpr will yeild results? Like after i adjust the fpr the gauge will go down?

 

Yep!

 

great thankyou, i didnt want to have to buy a new fuel rail.