Wants to stall under throttle at first start up
#42
I plan to trace it as far as I can. I guess the jist of the post was to be certain you have ground. If I buy a couple hundred dollar fuel pump and fry it or it gives me the same results I’m going to be really depressed. Not to mention explaining to my wife that I spent that much more and it still isn’t on the road.
#43
A couple of things.
1) There are two sets of two wires going to the pump assembly:
Power for the pump motor from the relay fuse box = Gray
Ground for the motor = black out to a splice pack on the frame and then black again to the frame ground
Your best bet here is check battery positive to battery negative during pump on and then compare that to probing gray and black right at the pump during pump on. It that net voltage to the pump is too low then we figure out if its the battery feed on the gray or the quality of the ground. If you want to check the quality of the ground now that ohm reading from pump motor black to a clean spot on the frame.
2) There are two wires for the fuel gauge sending unit:
Purple = the send signal for the computer
Black out to a splice pack that shares a connection with a black/white stripe into that splice block but that is not important right now.
If you really have a net 5V from gray to pump black right at the pump at pump on then we need to figure out why before you install a new pump
George
1) There are two sets of two wires going to the pump assembly:
Power for the pump motor from the relay fuse box = Gray
Ground for the motor = black out to a splice pack on the frame and then black again to the frame ground
Your best bet here is check battery positive to battery negative during pump on and then compare that to probing gray and black right at the pump during pump on. It that net voltage to the pump is too low then we figure out if its the battery feed on the gray or the quality of the ground. If you want to check the quality of the ground now that ohm reading from pump motor black to a clean spot on the frame.
2) There are two wires for the fuel gauge sending unit:
Purple = the send signal for the computer
Black out to a splice pack that shares a connection with a black/white stripe into that splice block but that is not important right now.
If you really have a net 5V from gray to pump black right at the pump at pump on then we need to figure out why before you install a new pump
George
#44
found here: 2000 S10 Fuel Pump Wiring - wikiduh.com
I believe it is worth checking to be sure it's not gonna fry Your pump.
Personally I don't thing Your pump could develop 60PSI on 5V power supply. It would have worked with less than a half of nominal power. And not holding the pressure doesn't sound like an electrical malfunction either. Is here a chance You've been measuring accidentally the fuel pump switch/sender maybe?
#45
Power[W]=Voltage[V] x Current [I]
It is not only the voltage, but also the current that will vary. A constant is the load value.
So, let's assume the pump has a 20W. From the above equation we may calculate the current that flows through to find out the load:
I=20W/12V=1.6A
load resistance would be
R=Voltage/Current=12V/1.6A=7.2Ohm
Since we have the resistance, we may check out what happens if the voltage drops down to 5V:
the current is going to be:
I=Voltage/Resistance=5V/7.2Ohm=0.694A
hence the power is going to be:
P=Voltage x Current =5V x 0.694A=3.47W
The pump power factor is going to be 3.47W to 20W which is 17% of the nominal power.
#46
So if grey is pump power, I will have to double check that terminal again. I don’t recall seeing voltage. I assume it will be constant voltage when the key is on?
Had to wrap up earlier yesterday for a birthday party. Next time I get out there that is where I will start.
The 5v was on the purple which looks like it is not involved for this issue.
somehow this post originally ended up on another post.
Had to wrap up earlier yesterday for a birthday party. Next time I get out there that is where I will start.
The 5v was on the purple which looks like it is not involved for this issue.
somehow this post originally ended up on another post.
#49
The purple 5 volt wire is the signal for the fuel gauge sender. The new pump will come with wiring as well. I'd solder all new and verify power and ground before pluging in my fancy new assembly. Happy wife happy life.
#50
I had a few minutes today and checked the gray wire. I have 11.7v there. So that at least checks out.
So as far as wiring goes, just try to hunt down why I have high resistance on the one black wire? Do you think that high resistance could have burned up this new pump or cause it not to hold pressure?
So as far as wiring goes, just try to hunt down why I have high resistance on the one black wire? Do you think that high resistance could have burned up this new pump or cause it not to hold pressure?