Help Dual Pumps not working
Help Dual Pumps not working Ok guys I'll try an make it short. I have a dual pump setup -8 line feed -6 return and it seems like the pumps are overheating. I currently have one pump running because the motor is being broken in at the current time. I've driven the car on two occassions approximately 45 miles and both pumps have overheated and malfunctioned. I've read were bad ventilation will cause your pumps to cavitate but I've also heard that walboros tend to overheat.. Any help is greatly appreciated..Thanks
No/insufficient vent will cause cavitation and overheat/failure.
Low volts will cause the problem.
Poor wiring.
Walbro overheat?? Nope, not w/ those I've used.
What's the fuel psi?
Return system, or deadhead?
Low volts will cause the problem.
Poor wiring.
Walbro overheat?? Nope, not w/ those I've used.
What's the fuel psi?
Return system, or deadhead?
Schematic on how they are plumbed??
What are you using for a tank vent?
What does a blower have to do w/ fuel @ 42psi? What injs are you using?
Voltage at the pump[s] is?
How are they grounded?
What are you using for a tank vent?
What does a blower have to do w/ fuel @ 42psi? What injs are you using?
Voltage at the pump[s] is?
How are they grounded?
He is running one of my systems which is wired/plumbed correctly.
I already gave pointers to try concerning the tank venting.... did you try these yet???
Also since the car did the same thing with the previous fuel pump, it is not likely any part of the kit (pumps, lines etc.) is causing this, but rather a pre-existing problem.... hence the reason I told you to verify the vent first & call me back.
Since I did not hear back from you I will assume you did not do this?
Verify & call me rather than going on a wild goose chase.
I already gave pointers to try concerning the tank venting.... did you try these yet???
Also since the car did the same thing with the previous fuel pump, it is not likely any part of the kit (pumps, lines etc.) is causing this, but rather a pre-existing problem.... hence the reason I told you to verify the vent first & call me back.
Since I did not hear back from you I will assume you did not do this?
Verify & call me rather than going on a wild goose chase.
Isn't it.. great, when the OP puts out just enough info, to get others involved, only to find out there's "more to the story"??
GL Lonnie!
GL Lonnie!
He is running one of my systems which is wired/plumbed correctly.
I already gave pointers to try concerning the tank venting.... did you try these yet???
Also since the car did the same thing with the previous fuel pump, it is not likely any part of the kit (pumps, lines etc.) is causing this, but rather a pre-existing problem.... hence the reason I told you to verify the vent first & call me back.
Since I did not hear back from you I will assume you did not do this?
Verify & call me rather than going on a wild goose chase.
I already gave pointers to try concerning the tank venting.... did you try these yet???
Also since the car did the same thing with the previous fuel pump, it is not likely any part of the kit (pumps, lines etc.) is causing this, but rather a pre-existing problem.... hence the reason I told you to verify the vent first & call me back.
Since I did not hear back from you I will assume you did not do this?
Verify & call me rather than going on a wild goose chase.
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What do you mean.. I'm asking a simple question to see what others have to say and what they have done to work out the problem... Yes I have done the things talked about but i had not posted yet to see what other ideas could be given to me. Also i'm not the kind of person to come out and tell everyone that a vendors double pump system isnt working. I give enough info so as not to bring negative attention to the vendor. For all anyone knows its my setup and thats it. End of story!! I come here to ask questions and hopefully have you guys with more experience give me advise. I work like everyone else, have a family and really dont have time to work on my car, so asking questions really cuts my problem solving in half. Get it??
Last edited by Tirefire; Dec 6, 2012 at 09:47 AM.
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Verdad Gallardo He is running one of my systems which is wired/plumbed correctly.
I already gave pointers to try concerning the tank venting.... did you try these yet???
Also since the car did the same thing with the previous fuel pump, it is not likely any part of the kit (pumps, lines etc.) is causing this, but rather a pre-existing problem.... hence the reason I told you to verify the vent first & call me back.
Since I did not hear back from you I will assume you did not do this?
Verify & call me rather than going on a wild goose chase.
I already gave pointers to try concerning the tank venting.... did you try these yet???
Also since the car did the same thing with the previous fuel pump, it is not likely any part of the kit (pumps, lines etc.) is causing this, but rather a pre-existing problem.... hence the reason I told you to verify the vent first & call me back.
Since I did not hear back from you I will assume you did not do this?
Verify & call me rather than going on a wild goose chase.
Again my reason for coming on here is for the advise from the experienced guys and people who have gone through this before. Thats all!!
Last edited by Tirefire; Dec 6, 2012 at 01:13 PM.
What do you mean.. I'm asking a simple question to see what others have to say and what they have done to work out the problem... Yes I have done the things talked about but i had not posted yet to see what other ideas could be given to me. Also i'm not the kind of person to come out and tell everyone that a vendors double pump system isnt working. I give enough info so as not to bring negative attention to the vendor. For all anyone knows its my setup and thats it. End of story!! I come here to ask questions and hopefully have you guys with more experience give me advise. I work like everyone else, have a family and really dont have time to work on my car, so asking questions really cuts my problem solving in half. Get it??
GL w/ the fix.
I'm always here to help you.
Experience wise, after building well over 1000 dual pump kits, I can likely point you to the problem without a lot of guesswork.
Problem is that after one pump stops working, the other still works, then vice versa.
This points to an overheating or cavitation problem.
You had this problem with a full tank of gas, so 1 pump will not overheat 15 gals of fuel in 30-40 minutes... especially in the winter months. Did you fill the car up again before trying the same experiment? You cannot get repeatable results using different situations. If it acts up twice as fast with half the fuel in the car, I would not be surpriced.
Both pumps have independent circuits, so a single wiring issue will not cause the same problem with 2 pumps.
This leads me to think something is causing cavitation.
Repeatedly cavitating a pump will cause it to fail.
It basically is running dry & self destructing.
Did you check the tank vent as described or drive the car with the cap loosened slightly?
After the pump overheats, it is too late, you need to do his before it acts up.
Try the cap trick & see what happens.
Also verify the tank is not getting hot from the exhaust.
Experience wise, after building well over 1000 dual pump kits, I can likely point you to the problem without a lot of guesswork.
Problem is that after one pump stops working, the other still works, then vice versa.
This points to an overheating or cavitation problem.
You had this problem with a full tank of gas, so 1 pump will not overheat 15 gals of fuel in 30-40 minutes... especially in the winter months. Did you fill the car up again before trying the same experiment? You cannot get repeatable results using different situations. If it acts up twice as fast with half the fuel in the car, I would not be surpriced.
Both pumps have independent circuits, so a single wiring issue will not cause the same problem with 2 pumps.
This leads me to think something is causing cavitation.
Repeatedly cavitating a pump will cause it to fail.
It basically is running dry & self destructing.
Did you check the tank vent as described or drive the car with the cap loosened slightly?
After the pump overheats, it is too late, you need to do his before it acts up.
Try the cap trick & see what happens.
Also verify the tank is not getting hot from the exhaust.
Last edited by Lonnies Performance; Dec 6, 2012 at 08:17 PM.