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Posted: 7/28/2018 6:51:34 PM EDT
[#1]
should've bought a Honda Gayline
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Posted: 7/28/2018 6:54:01 PM EDT
[#2]
Quoted:
The moment I turn the power on my fuel pump fuse blows. I scoured over the wiring and everything looks fine. I dropped the tank and pulled the plug on the fuel pump and it didn't blow. I replaced the fuel pump and the there was no difference. The fuse pops instantly. Is there a control module for the fuel system that could be dead shorting? |
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Posted: 7/28/2018 6:54:15 PM EDT
[#3]
There might be a fuel pump relay. Could be internally shorted.
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Posted: 7/28/2018 6:55:22 PM EDT
[#4]
Quote HistoryQuoted:
should've bought a Honda Gayline 
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Posted: 7/28/2018 6:55:54 PM EDT
[#5]
If the fuse didn't blow when you unplugged the pump, that would imply that your problem is right at the fuel pump - not at some control module located before it.
However, replacing the fuel pump should have fixed it. Strange. |
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Posted: 7/28/2018 6:57:14 PM EDT
[#6]
Just a WAG, but there's most likely a fuel pump relay.
You would think it would blow the fuse with the pump disconnected but weird stuff happens with electrical issues. ETA 3 min. slow. |
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Posted: 7/28/2018 8:13:41 PM EDT
[#7]
Quote HistoryQuoted:
There might be a fuel pump relay. Could be internally shorted. I'm wondering if there is a module of some sort. |
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Posted: 7/28/2018 8:14:13 PM EDT
[#8]
Quote HistoryQuoted:
If the fuse didn't blow when you unplugged the pump, that would imply that your problem is right at the fuel pump - not at some control module located before it. However, replacing the fuel pump should have fixed it. Strange. It doesn't even have time to draw a load. |
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Posted: 7/28/2018 9:55:53 PM EDT
[#9]
At the tank, does the fuel pump share the same connector with the fuel gauge sender?
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Posted: 7/28/2018 10:02:17 PM EDT
[#10]
Seeing that this is a "northern" truck, have you checked the fuse box and fuel pump connections for corrosion? (no green or white salty look)
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Posted: 7/28/2018 10:07:56 PM EDT
[#11]
Quote HistoryQuoted:
At the tank, does the fuel pump share the same connector with the fuel gauge sender? I just watched a video describing a similar situation where the "fuel pump ECU" failed and was sending low voltage to the fuel pump. I found the module but I have no way to test it. |
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Posted: 7/28/2018 10:08:26 PM EDT
[#12]
Quote HistoryQuoted:
Seeing that this is a "northern" truck, have you checked the fuse box and fuel pump connections for corrosion? (no green or white salty look) |
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Posted: 7/28/2018 10:26:42 PM EDT
[#13]
Quote HistoryQuoted: They are all clean like new. 2wd or 4wd? |
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Posted: 7/28/2018 10:33:17 PM EDT
[#14]
Use a higher amp fuse.
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Posted: 7/28/2018 10:34:04 PM EDT
[#15]
Sounds like you have a short somewhere.
I'd just run a on/off switch to the new pump with it's own relay. cut out the fancy pants electrical system 
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Posted: 7/28/2018 10:34:28 PM EDT
[#16]
Quote HistoryQuoted:
Use a higher amp fuse.
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Posted: 7/28/2018 10:35:23 PM EDT
[#17]
Quote HistoryQuoted:
v6 0r v8? 2wd or 4wd? Quote HistoryQuoted:
Quoted: They are all clean like new. 2wd or 4wd? |
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Posted: 7/28/2018 10:39:15 PM EDT
[#18]
I had an issue with moisture in this truck. If it would rain hard the truck would not idle correctly. The fast idle would die right away and it would drop really low and stumble and stall. Only if it sat for a while in wet conditions.
I am wondering if the ECU has a crack in it letting in moisture. |
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Posted: 7/28/2018 10:58:26 PM EDT
[#19]
Lies, Toyotas and 6.5CM are invincible.
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Posted: 7/28/2018 11:06:25 PM EDT
[#20]
No recalls or bulletins apply to what you've got going on.
Truck has a Bus/can communication system. Me thinks you are better off having a dealership/shop investigate it. |
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Posted: 7/28/2018 11:10:14 PM EDT
[#21]
You might PM Furyataurus - He's an old, grizzled Toyota tech who also drives a Tundra.
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Posted: 7/28/2018 11:11:07 PM EDT
[#22]
Quote HistoryQuoted:
Ah, the short finder. Keep going bigger until you let the smoke out. Quote HistoryQuoted:
Quoted:
Use a higher amp fuse. Works everytime!
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Posted: 7/28/2018 11:30:33 PM EDT
[#23]
Quote HistoryQuoted:
No recalls or bulletins apply to what you've got going on. Truck has a Bus/can communication system. Me thinks you are better off having a dealership/shop investigate it. If the ECU is plug and play, at this point it can't hurt. |
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Posted: 7/28/2018 11:31:39 PM EDT
[#24]
Quote HistoryQuoted:
You might PM Furyataurus - He's an old, grizzled Toyota tech who also drives a Tundra. |
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Posted: 7/28/2018 11:39:06 PM EDT
[#25]
Try swapping relays.
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Posted: 7/28/2018 11:56:58 PM EDT
[#26]
Looks like the power goes from the fuse, through the relay, into the fuel pump control unit and to the pump
Did you replace the whole fuel pump and sender assembly or just the pump |
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Posted: 7/29/2018 12:16:14 AM EDT
[#27]
Quote HistoryQuoted:
Looks like the power goes from the fuse, through the relay, into the fuel pump control unit and to the pump Did you replace the whole fuel pump and sender assembly or just the pump |
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Posted: 7/29/2018 12:17:11 AM EDT
[#28]
Quote HistoryQuoted:
Try swapping relays. |
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Posted: 7/29/2018 12:47:17 AM EDT
[#29]
When you replaced the fuel pump did you plug it in and test it before you put it in the fuel tank if it didnt blow the fuse testing it while not in the tank you have a wire rubbing somewhere near the tank when the pump is in rhe tank and up in place look around for chafed wires
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Posted: 7/29/2018 1:12:20 AM EDT
[#30]
Check the physical connector to the pump. Could be contacts that are shorting,
but only when plugged in. I had a cracked connector that was intermittent once and only found it when I started yanking on the wiring harness in frustration. Does the pump connector provide all connections (e.g. you don't have any grounding issues?) |
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Posted: 7/29/2018 1:20:27 AM EDT
[#31]
Quote HistoryQuoted: I bought the entire assembly that drops into the tank. It could be an module issue but you need a wiring diagram to look to see how the circuit flows. Does the module ground the circuit? Without a wiring diagram you are just shooting in the dark. I can pull up the diagram monday to help. |
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Posted: 7/29/2018 1:49:53 AM EDT
[#32]
Quote HistoryQuoted:
How many parts are there to this system? The fuel pump is new. The wiring is fine as far as I can tell. The ECU is only $117 on Ebay. If the ECU is plug and play, at this point it can't hurt. Quote HistoryQuoted:
Quoted:
No recalls or bulletins apply to what you've got going on. Truck has a Bus/can communication system. Me thinks you are better off having a dealership/shop investigate it. If the ECU is plug and play, at this point it can't hurt. On new G.M. trucks, a cracked headlight or blown turn signal bulbs can cause driveability and no start conditions. 
And, usually ECU's require programming/set up after installation. (Requires access to Toyota tisweb.) Welcome to the new world of automobile repair. |
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Posted: 7/29/2018 1:56:01 AM EDT
[#33]
Is your fuse marked as fuel pump or EFI?
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Posted: 7/29/2018 2:01:20 AM EDT
[#34]
Quote HistoryQuoted:
Check the physical connector to the pump. Could be contacts that are shorting. If the fuel gauge sender was powered by that same fuse (which seems unlikely), a short in it could actually be what was blowing the fuse. |
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Posted: 7/29/2018 4:22:11 AM EDT
[#35]
I had a car that did this and it was because the wiring was corroded inside the insulation. Strip a little insulation off and see if the wire is turning green or black. Make sure you seal it up real good where you stripped it. I use liquid tape and then 3m tape over that when I do this. On the car I had I ran new wires for the fuel pump circuit. If there's no corrosion I would follow the wire along the whole run and inspect it very carefully. You could also check the resistance of the circuit, but I have no idea what it should be. You should be able to get close by measuring the size of the wire and looking up the ohms per foot. It might be faster and easier to just rewire the circuit than to spend hours locating the short.
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Posted: 7/29/2018 4:55:14 AM EDT
[#36]
Do you have rats ? ? ?
Rodents Are Feasting On Newer Cars' Soy-Based Wiring Insulation Happened to my FIL's Toyota Tundra. |
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Posted: 7/29/2018 5:09:33 AM EDT
[#37]
The new fuel pump may be bad.
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Posted: 7/29/2018 9:36:24 AM EDT
[#38]
Quote HistoryQuoted:
Is your fuse marked as fuel pump or EFI? |
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Posted: 7/29/2018 9:37:50 AM EDT
[#39]
Quote HistoryQuoted:
Yeh, that was what I was wondering - Maybe something else is bad that plugs into that same connector. If the fuel gauge sender was powered by that same fuse (which seems unlikely), a short in it could actually be what was blowing the fuse. Quote HistoryQuoted:
Quoted:
Check the physical connector to the pump. Could be contacts that are shorting. If the fuel gauge sender was powered by that same fuse (which seems unlikely), a short in it could actually be what was blowing the fuse. |
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Posted: 7/29/2018 9:39:37 AM EDT
[#40]
Quote HistoryQuoted:
@batmanacw can you locate the wiring diagram for your vehicle? It could be an module issue but you need a wiring diagram to look to see how the circuit flows. Does the module ground the circuit? Without a wiring diagram you are just shooting in the dark. I can pull up the diagram monday to help. Quote HistoryQuoted:
Quoted: I bought the entire assembly that drops into the tank. It could be an module issue but you need a wiring diagram to look to see how the circuit flows. Does the module ground the circuit? Without a wiring diagram you are just shooting in the dark. I can pull up the diagram monday to help. |
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Posted: 7/29/2018 9:48:41 AM EDT
[#41]
Quote HistoryQuoted:
If the fuse didn't blow when you unplugged the pump, that would imply that your problem is right at the fuel pump - not at some control module located before it. However, replacing the fuel pump should have fixed it. Strange. Change the relay. |
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Posted: 7/29/2018 9:51:42 AM EDT
[#42]
Quote HistoryQuoted:
When you replaced the fuel pump did you plug it in and test it before you put it in the fuel tank if it didnt blow the fuse testing it while not in the tank you have a wire rubbing somewhere near the tank when the pump is in rhe tank and up in place look around for chafed wires |
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Posted: 7/29/2018 9:54:11 AM EDT
[#43]
Looks like the relay feeds that fuel pump control ecu, then power goes straight to the fuel pump. I’d lean toward that ecu.
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Posted: 7/29/2018 10:31:49 AM EDT
[#44]
Quote HistoryQuoted:
I switched the relay for another one and same result. |
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Posted: 7/29/2018 10:40:14 AM EDT
[#45]
Quote HistoryQuoted:
Do you have rats ? ? ? Rodents Are Feasting On Newer Cars' Soy-Based Wiring Insulation Happened to my FIL's Toyota Tundra. 
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Posted: 7/29/2018 10:57:49 AM EDT
[#46]
I pulled the plug on the ECU and it didn't blow the fuse on power.
I destroyed the bracket holding the ECU trying to get the rusted bolt out but that is not a big deal. I can fab up a new one. I'm pretty sure the ground runs through the frame so I'll need a new one. |
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Posted: 7/29/2018 10:58:52 AM EDT
[#47]
Quote HistoryQuoted:
It is a relay. With the module unplugged it sends no power. Change the relay. Quote HistoryQuoted:
Quoted:
If the fuse didn't blow when you unplugged the pump, that would imply that your problem is right at the fuel pump - not at some control module located before it. However, replacing the fuel pump should have fixed it. Strange. Change the relay. |
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Posted: 7/29/2018 11:02:43 AM EDT
[#48]
Quote HistoryQuoted:
Or this Quote HistoryQuoted:
Quoted:
When you replaced the fuel pump did you plug it in and test it before you put it in the fuel tank if it didnt blow the fuse testing it while not in the tank you have a wire rubbing somewhere near the tank when the pump is in rhe tank and up in place look around for chafed wires |
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Posted: 7/29/2018 11:07:57 AM EDT
[#49]
Quote HistoryQuoted:
Looks like the relay feeds that fuel pump control ecu, then power goes straight to the fuel pump. I’d lean toward that ecu. https://i.imgur.com/Nahlvlu.jpg |
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Posted: 7/29/2018 4:49:34 PM EDT
[#50]
Just unplug the pump the relay and the computer
Put a fuse in it. Plug the relay in and check the fuse. Then plug the computer in and check the fuse Then plug the pump in and check the fuse. This will atleast marrow it down to an area. Jumping the wires isn’t going to tell you much. |
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