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J20A Engine - Measure Fuel Pressure?
12-20-2018, 05:31 AM
Post: #1
J20A Engine - Measure Fuel Pressure?
I have a J20A Engine (2.0L DOHC 16V). I want to know the fuel pressure by using a hand held gauge. Where can I tap into so I get an accurate reading?

Here is my setup...

[Image: IMG-0285.jpg]
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12-20-2018, 06:28 AM
Post: #2
RE: J20A Engine - Measure Fuel Pressure?
is this stock car / what car, what year?
ok on ours the end of the fuel rail has plug we can replace, with 14mm to NPT fitting. pipe threaded
the left side blow, is to tank pump , feed line
the right side many have a plug , just under that NEW FPR there.
also look at the fuel filter fitting there as pressure tap point, 6mm on ours. but no all year have this.
atm2267 fits ours. the plug fits our J20 in the SW420 grand vitara up to 2004, beyond, IDK but
if you mike the plug thread it its 14mm
Fitting, Metric Adapter, Oil Pressure, 1/8 in. NPT Female to 14mm x 1.5 Male, Each 1.5 pitch, $14 each at summit racing.

http://www.fixkick.com/INJECTORS/Schrader-vales.html



(12-20-2018 05:31 AM)redline814 Wrote:  I have a J20A Engine (2.0L DOHC 16V). I want to know the fuel pressure by using a hand held gauge. Where can I tap into so I get an accurate reading?

Here is my setup...

[Image: IMG-0285.jpg]

http://www.fixkick.com
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12-21-2018, 01:44 AM
Post: #3
RE: J20A Engine - Measure Fuel Pressure?
Once again...you rock! Question answered. Thank you.

I ordered various parts to screw a permanent fuel gauge on the end of the rail. Straight on or if needed bent 90 degree to face up.

[Image: Untitled.png] [Image: atm-2267-xl.jpg]

[Image: IMG-0282.jpg]
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12-21-2018, 02:04 AM
Post: #4
RE: J20A Engine - Measure Fuel Pressure?
your are welcome
it should fit, not sure on j20Bs the totally re-designed J20. but yours looks like 14mm me.

(12-21-2018 01:44 AM)redline814 Wrote:  Once again...you rock! Question answered. Thank you.

I ordered various parts to screw a permanent fuel gauge on the end of the rail. Straight on or if needed bent 90 degree to face up.

[Image: Untitled.png] [Image: atm-2267-xl.jpg]

[Image: IMG-0282.jpg]

http://www.fixkick.com
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12-23-2018, 07:41 AM (This post was last modified: 12-23-2018 08:00 AM by redline814.)
Post: #5
RE: J20A Engine - Measure Fuel Pressure?
I received the parts and have them installed. Perfect fit!

[Image: IMG-0313.jpg]


Next question...
With the pump on I set the fuel pressure to 35psi (engine off). As soon as the pump is turned off, the pressure instantly drops to 25psi. Within 60 seconds it goes down to 0psi. I thought the system was to remain pressurized (for a least a minute) when the pump is turned off? I checked the system (hoses) and did not find any leaks. Pinching the return line...the pressure remains at 24psi for 1 minute.

[Image: fuel-pressure.jpg]


I'm using a Mallory 4305M FPR...

[Image: FPR.jpg]
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12-24-2018, 12:03 AM
Post: #6
RE: J20A Engine - Measure Fuel Pressure?
I have no idea at all what car that is nor that custom setup
on a stock car , that return line blocked (or pinched and keyed off ) if the pressure does hold now, that is hard proof the FPR leaks.(with no vacuum)
but that car is not stock.
the slow leak down only allows, 2 things to be better
faster restarts
and to see if the injectors like,. (and dont in your case)

happy holiday!


(12-23-2018 07:41 AM)redline814 Wrote:  I received the parts and have them installed. Perfect fit!

[Image: IMG-0313.jpg]


Next question...
With the pump on I set the fuel pressure to 35psi (engine off). As soon as the pump is turned off, the pressure instantly drops to 25psi. Within 60 seconds it goes down to 0psi. I thought the system was to remain pressurized (for a least a minute) when the pump is turned off? I checked the system (hoses) and did not find any leaks. Pinching the return line...the pressure remains at 24psi for 1 minute.

[Image: fuel-pressure.jpg]


I'm using a Mallory 4305M FPR...

[Image: FPR.jpg]

http://www.fixkick.com
Visit this user's website Find all posts by this user
Quote this message in a reply
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