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Old 08-11-2014, 10:53 AM   #1
Fireball
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Question Question: Installing Fuel Pressure Gauge

I've been thinking of installing a fuel pressure gauge..
I'm aware that it's unsafe to use a mechanical one... so to use an electric one with a sender, would I still run the the mechanical connection off the schrader valve on the end of the fuel rail to an electronic sender and then into the dash?

I figure it's something that's real handy to have and can probably be transferred from vehicle to vehicle.

Thoughts?
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Old 08-11-2014, 11:32 AM   #2
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Connecting to the schrader valve is probably the best point unless you put a adjustable FPR or custom lines.
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Old 08-11-2014, 12:19 PM   #3
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I have a mechanical one connected to my schrader valve with no issues. Been that way for 2 years.
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Old 08-11-2014, 02:55 PM   #4
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Alright... thanks guys.

So I'm thinking of buying this..

If I wanted to buy some fuel line to mount the pressure sender on say the firewall..

What size line? any other adapters required?

http://www.amazon.com/MaxTow-100-Fue...pressure+gauge

Thanks!
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Old 08-11-2014, 03:48 PM   #5
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You can use a mechanical gauge. You just shouldn't run a fuel line into the passenger compartment. If you use a mechanical gauge you have to mount it in the engine bay somewhere. Many people use that type of gauge simply because it is much cheaper. It will work just fine, but you can't see what the fuel pressure is doing while you are driving, which limits it's usefulness in my opinion.

As they say, you get what you pay for. An electrical gauge with a sending unit is more expensive but you can mount it inside the car so you can see the gauge all the time. I personally would not get the gauge in that link though. Glowshift gauges are not known for their reliability. It will cost a bit more to get one of the reputable brands like Autometer or AEM but it's worth it in the long run. You could end up having to buy two gauges when the first cheap one stops working after a year or two.

As for install, you can hook it to the port on the end of the fuel rail. You just have to take out the schrader valve first. You need a -4AN female fitting to go on the rail, some hose or another type of adapter to hook it to, and some thing with a 1/8"NPT female thread on it to screw the sensor into.
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Old 08-11-2014, 05:45 PM   #6
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Thanks for the info guys!
I too would prefer to be able to watch this in cabin; it would be very informative to be able to monitor while driving.

You could probably transfer this to most vehicles as well!

Hopefully I'll buy and install a more reputable gauge within the next 2-3 weeks.
If I do, I'll post my experiences here!

Thank you
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Old 08-11-2014, 09:11 PM   #7
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Old 08-11-2014, 09:35 PM   #8
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Quote:
Originally Posted by Fireball View Post
What size line? any other adapters required?

Ensure the line and fittings used are rated for fuel and for a safe pressure; rubber fuel line, barb fittings and hose clamps are a surefire (pun intended) path to a bad day.
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Old 08-11-2014, 10:04 PM   #9
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I've always been curious... Why would you need a fuel pressure gauge? Are you concerned your pump is on the way out?
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Old 08-11-2014, 10:59 PM   #10
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Its a good thing to monitor if you have a good built motor you want working properly. .

To me thats one of the important things to have to monitor.

Oil pressure, A/F, fuel pressure, are all good things to monitor on a car you race or just simply care for. Without fuel, no power. Without oil pressure you can blow the motor up, a/f can tell if you have issues running rich or lean.
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Old 08-11-2014, 11:09 PM   #11
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Quote:
Originally Posted by tejohnson View Post
I've always been curious... Why would you need a fuel pressure gauge? Are you concerned your pump is on the way out?
Fuel pump, FPR, several feet of wiring, or electrical connections, relays; check for consistent fuel pressure and performance under various conditions.

Of course, I'm a hypochondriac
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Old 08-11-2014, 11:35 PM   #12
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Yeah, checking for fuel pump performance/correct pressure under boost would be one reason. If you get a big cam that changes your vacuum that will change the base pressure as well and I usually recommend getting an AFPR at that point, which you'll need a fuel pressure gauge to adjust. And it's just generally good for diagnosing problems, ie if the car won't start and you have no fuel pressure it gives you a good idea where to start looking.
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Old 08-12-2014, 09:47 AM   #13
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WBO2 does a great job! Just a consideration, if you are tuning...
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