Fuel Pressure Guage Reading Low
06-12-2009, 01:44 AM
#11
On the driver's side fuel rail, near the middle of the rail should be a small vacuum hose pushed onto the fuel pressure regulator. Pull off the hose and start the engine, see what your fuel pressure is. You can plug the vacuum hose with a small phillips screwdriver if you want, but you're only gonna start the engine for a few seconds, so it's not important.
06-12-2009, 11:03 PM
#12
UPDATE-At least my truck isn't fucked up.
I bought a cheap little fuel pressure gauge from harbor freight and after a bit of wrestling with it, I got it working. It's reading around 49-50 with the key on and a tiny bit lower with the engine running.
I suppose that means the sender for my gauge is messed up. I'm still at a loss as to why it's reading right, just 10 psi low.
I bought a cheap little fuel pressure gauge from harbor freight and after a bit of wrestling with it, I got it working. It's reading around 49-50 with the key on and a tiny bit lower with the engine running.
I suppose that means the sender for my gauge is messed up. I'm still at a loss as to why it's reading right, just 10 psi low.
06-12-2009, 11:13 PM
#13
UPDATE-At least my truck isn't fucked up.
I bought a cheap little fuel pressure gauge from harbor freight and after a bit of wrestling with it, I got it working. It's reading around 49-50 with the key on and a tiny bit lower with the engine running.
I suppose that means the sender for my gauge is messed up. I'm still at a loss as to why it's reading right, just 10 psi low.
I bought a cheap little fuel pressure gauge from harbor freight and after a bit of wrestling with it, I got it working. It's reading around 49-50 with the key on and a tiny bit lower with the engine running.
I suppose that means the sender for my gauge is messed up. I'm still at a loss as to why it's reading right, just 10 psi low.
09-20-2009, 12:09 PM
#15
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do you guys have the little black box gauges or the newer ones? ive got an extra little black box that i will sell for cheap if that may be the problem. i just gotta make sure they both work the same on my truck first haha
... totally forgot i was searching for something when i seen this and that its old...... boo for me
... totally forgot i was searching for something when i seen this and that its old...... boo for me
10-21-2009, 09:36 PM
#16
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hate to bring up an old thread but my fuel pressure reads the same. and i have the same gauge. 50 key on, 45 engine running, because i still have a FMU with my supercharger kit im seeing over 100 psi at full boost!
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