stumped by a drop in fuel pressure
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From: West Palm Beach, FL
stumped by a drop in fuel pressure Guys, I need some help....I had an odd pressure drop, and I can't figure it out.
I had a dual pump setup done, and the car would run at 60 psi, with the 2nd pump coming on only under boost. Under WOT, the pressure would drop maybe 2 psi until the 2nd pump came on, then right back to 60.
Then, driving around, I blew a silicone coupler that shot one of my charge pipes up and bounced around back by the fuel tank. That caused a drop in pressure down to the 40's. I pulled the pumps, changed out a suspect T connector, and replaced the fuel lines in the tank to be sure. Now the car will idle around 56, but when I drive normally, any gear, the pressure will drop to around 50. If I go WOT, it drops into the low 40's....until the 2nd pump comes on, then up to 58.
I have visually checked all the lines, and everything I can think of, but nothing. Could it be the shock of the pipes caused the pump to go bad?? That doesn't seem likely, but I'm out of ideas.
I had a dual pump setup done, and the car would run at 60 psi, with the 2nd pump coming on only under boost. Under WOT, the pressure would drop maybe 2 psi until the 2nd pump came on, then right back to 60.
Then, driving around, I blew a silicone coupler that shot one of my charge pipes up and bounced around back by the fuel tank. That caused a drop in pressure down to the 40's. I pulled the pumps, changed out a suspect T connector, and replaced the fuel lines in the tank to be sure. Now the car will idle around 56, but when I drive normally, any gear, the pressure will drop to around 50. If I go WOT, it drops into the low 40's....until the 2nd pump comes on, then up to 58.
I have visually checked all the lines, and everything I can think of, but nothing. Could it be the shock of the pipes caused the pump to go bad?? That doesn't seem likely, but I'm out of ideas.
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From: West Palm Beach, FL
I haven't checked the voltage, and what you are describing is what I figured to be the most likely issue. But, I don't see anything damaged. Next stupid question is, do I have to use a voltmeter to check the voltage, or is there a sensor I can scan with HP Tuners to see what kind of voltage I'm getting.
First,
If you purchased of my kits, give me a call at 724-322-8505. I'm also available weekends 9:00am-11:00pm eastern time.
If not try to measure the voltage at the fuel pump relays with a volt meter & also check the grounds for the pumps. This is just as important. The car or battery voltage means nothing.
Sounds like the second pump is working, but there is a problem due to leakage or volume.
Does the system hold pressure when you shut off the car? Has this changed recently?
Will the system support the power requirements of the engine? How much power are you making? Just trying to figure how much flow you have.
If you purchased of my kits, give me a call at 724-322-8505. I'm also available weekends 9:00am-11:00pm eastern time.
If not try to measure the voltage at the fuel pump relays with a volt meter & also check the grounds for the pumps. This is just as important. The car or battery voltage means nothing.
Sounds like the second pump is working, but there is a problem due to leakage or volume.
Does the system hold pressure when you shut off the car? Has this changed recently?
Will the system support the power requirements of the engine? How much power are you making? Just trying to figure how much flow you have.
Thread Starter
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From: West Palm Beach, FL
Lonnie, thanks for the offer, but this was not one of your kits. It does hold pressure when I turn the car off. And it primes fine, car starts right up. When you sya an issue with volume...what does that mean?
As for the power....I haven't turned the boost up on this car yet. It had seen 8 psi for a while, but when this all happened, I turned the boost down to 5. So it isn't making a ton of power right now. Once I get rid of this little issues I keep running into, I'm figuring somewhere between 12-15 psi, and close to 700 rwhp. Money is a bit tight now, but I do want to upgrade further....do you think it's necessary?
As for the power....I haven't turned the boost up on this car yet. It had seen 8 psi for a while, but when this all happened, I turned the boost down to 5. So it isn't making a ton of power right now. Once I get rid of this little issues I keep running into, I'm figuring somewhere between 12-15 psi, and close to 700 rwhp. Money is a bit tight now, but I do want to upgrade further....do you think it's necessary?
Thread Starter
TECH Enthusiast
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Joined: Sep 2004
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From: West Palm Beach, FL
Lonnie, if you can pm me for now...just let me know what kind of dough we're talking about. Like I said, things are a bit tight right now.....I sell real estate, which is kind of like selling ice to eskimo's right now!!
