Fuel Pressure Gauge

[GTP091]

I have a Marshall fuel pressure gauge and I was wondering what the best way to attach it to my fuel line would be. I had thought the Schrader valve would be a good spot to do it at but would need a fitting that could press the valve in. Is there a fuel rated fitting for this?? Or is there a better way?? I would like to put it to the right of the twin DOHC cover between the throttle and front cam carrier cover (seems like a good spot). It has a 1/8 " NPT fitting on the gauge; I've found a thing called a banjo adapter but it only seems to be half the solution. I think I would need some fuel hose to get to the other side of the cover from the schrader valve a fitting for the schrader valve to the hose and a fitting from the hose to the gauge. Any ideas for this??

[asylummotorsports]

Can't you simply remove the valve the way you would a tire valve?

Now you have a source to monitor pressure.

Then you can run a fuel appropriate hose to about wherever you like.

[55trucker]

I suppose that you could (if there is a hydraulic hose shop in town) have an 15" or so length of Aeroquip single braided hose cut and on one end a Schrader valve nipple inserted and crimped, and on the other end a female pipe nipple to screw into your male pipe fitting on the gauge.

[Dave96z34]

May have a problem bleeding the air but its doable.

[GTP091]

where do you think the best place to get these fittings would be?? I've looked in auto supply stores and hardware stores that have brass fittings but none seem to be the right size. Really I would need to find a replacment fuel pressure tester hose and put my gauge on the end of it; or make one. Any ideas where to get these parts??

[55trucker]

Well, where you live..are there any hydraulic shops that build custom hoses for say, heavy truck or PTO application?..I should've also mentioned that what else is needed is the brass *block* that would screw into the base of the gauge which has the schrader pressure relief valve to bleed off the air. This would look identical to the same sort of block that an engine compression tester makes use of to release the pressure in the gauge.

[asylummotorsports]

Actually you wouldn't need a pressure relief valve at the gauge any more than you would on a mechanical oil pressure gauge.

The gauge will read the pressure the fuel puts on the air in the line.

If you look at a mechanical oil pressure gauge with a nylon line you will see the oil doesn't actually get to the gauge in 99% of the installations.

Heck even the Autometer fuel pressure gauges run through a diaphram to keep fuel out of the car, which is why NHRA/IHRA now allow the gauges in the passenger compartment.

Now I AM NOT suggesting you put the gauge in the car!!!

Just don't worry about the little bit of air that may be in the line.

Hell you're not going to want to have to bleed the damn thing off every time you start the car.

[GTP091]

There's lots of hydraulic shops here I just didn't think the hoses are suitable for gasoline. Maybe bulk fuel hose and there ends would work, or is hydraulic hose, gas safe?? Thanks for the ideas guys once again this site is much more help than my local 'performance auto parts store'.

[asylummotorsports]

Neoprene is safe for gasoline, just make sure it's high pressure/braided stuff.

Anything Russel, Earl's or Aeroquip sell is more than adequate.

And they will have the fittings you need.

Or just call Summit or Jegs and explain what you need. They will send it all to you and you can assemble it yourself. (Tape the hose before you cut it.)

Or search Jegs Part numbers 555-41057 or 555-41058 or 555-41059.

3, 4 and 6 feet respectively. They would work, with the possible exception of an adapter at the Schrader valve.

Failing that, take the stuff to a local hydraulic shop and have them make up a line for you. Unless they are fully anal it shouldn't be more than $20 or so.

[Schurkey]

I would like to put it to the right of the twin DOHC cover between the throttle and front cam carrier cover (seems like a good spot).

If you can't see the gauge when the vehicles is at full throttle and maximum RPM, the gauge is one step away from useless.

[GTP091]

If you can't see the gauge when the vehicles is at full throttle and maximum RPM, the gauge is one step away from useless.

I don't have a mullet so mounting it on the hood is out of the question. I can see it at any throttle position and any RPM just not with a load on it . I'm mostly only doing this to monitor the fuel pressure at idle anyway.

[qwikgta]

I did this same thing. I put it on the fuel rail. The one I purchased had the other part on it that lets you mount it on the rail. And yes, you do simply remove the center of the valve and mount it on the rail. I bought one that fit a 3.8 Turbo motor from a Buick Regal. I think the Fbody one fits too.

Rob

[3400-95-Modified]

Electronic gauge FTW... It's on my pillar so I can see my pressure at all times.

[RedZMonte]

If you can't see the gauge when the vehicles is at full throttle and maximum RPM, the gauge is one step away from useless.

X2....