Articles » Install a B&M Fuel Pressure Gauge

This how-to focuses on the install of a B&M fuel pressure gauge on a 2000 Honda Civic Si; however, many of the points and methods used in this article can be applied to a similar install on another vehicle. As always, I assume no responsibility for anything that happens to your car. Following these directions is your own choice and I can not be held liable.

Now, with that out of the way, let's move on to the actual install. First, you'll need the following tools:

- 2 17mm or 3/4" wrenches
- 17mm socket and wratchet (if you only have one of the above wrenches)
- 18mm socket (same as above...this is for the B&M replacement bolt)
- 15 mm wrench
- 11 mm wrench
- 10 mm wrench
- Torque wrench (optional)
- Thread Sealant (don't use teflon tape)
- Rags

First start by disconnecting your battery's negative terminal. Next we have to relieve fuel pressure in the system before removing the bolt on the fuel filter. To do this, go remove the fuel filler cap and set it aside.

Now locate the fuel filter as pictured to the left.

Then place some of the rags around the fuel filter incase in some fuel spills out when removing the bolt. On the Si, the bolt is 17 mm and the hex-base below it is also 17 mm. Use a wrench to secure the fuel filter here and then another wrench or wratchet to remove the bolt holding the fuel line on. Be sure to cover it all with a rag when doing the initial turn to loosen it. Some fuel may spray out and this will prevent it from hitting you in the eye.

Now that you have the bolt loosened, go ahead and remove it carefully...there will most likely be some fuel that spills out at this point. The washer ontop of the fuel line end we won't need and the one on the bottom can be re-used if it's in good condition. However, it is recommended that you replace this each time you remove this bolt.

Pictured to the right is the old bolt on the left and the new one on the right. Make sure all surfaces are clean and go ahead and install the new bolt using the copper washer they provided ontop of the fuel line fitting and the stock washer on the bottom of the fitting. Torque this bolt to 26 ft. lbs. using your 18mm socket or wrench.

Now take your thread sealant and apply some to the threads of the elbow about 3/4 of the way around skipping the first one or two threads. Note: this elbow is optional. You can skip ahead and install the gauge directly into the bolt in the fuel filter if you'd rather have the gauge facing that way.

Next install the elbow you just prepped into the fuel filter bolt and make sure to tighten it to face the direction you want the gauge to be. Your 15mm wrench should fit the end. B&M recommends 17 or so ft. lbs. to torque this...it's not precise because the torque will vary inorder to get it to face the right direction. Just make sure it's good and snug and the thread sealant will prevent any fuel from leaking through. Be sure to secure the fuel filter while tightening this so as not to put too much stress on the fuel filter bracket.

Now apply the thread sealant to the gauge threads as you did with the elbow and install it into the elbow (or, if you skipped the elbow step, install the gauge directly into the fuel filter bolt). This has an 11mm end. Torque it the same way you did the elbow as well making sure it's good and snug and also facing the direction you want.

And voila, you're done. Now just reconnect your battery, put the fuel filler cap back in, remove any tools or rags in the engine bay and start up the car. Check for any leaks and if there are none, you're set! Be sure to check it again after a day or two to make sure nothing has started leaking.