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Discussion Starter · #1 ·
During the pandemic, I let my 2007 Taco, Double Cab, 4X4 V6 sit on the driveway. Well, to be completely honest, it sat a little before the pandemic started. So now I need to drain the gas and change the oil. I learned the hard way you can not siphon the gas because of measures put in place to prevent thievery. An internet search has suggested to jump the relay and use the fuel pump to pump out the gas.

I figured this was easier than dropping the fuel tank so I embarked upon this journey. Research said 99.9% of relays have 4 pins and they are marked 30, 85, 86, and 87. Furthermore, the diagram is also listed on the side of them. Well, a struggle and a half later, I safely removed the Fuel Pump Relay and SURPRISE!!!! it's 5 pins with no markings, and no diagrams.

Brown Circuit component Font Magenta Metal


I start doing research on the Denso 90084 - 98032 to see if I could find a pin diagram as I am supposed to connect pins 30 and 87 to have the fuel pump pump out my gas. Well, as it would have it, no such diagram exists. I did however stumble upon this diagram on a Toyota 4 Runner forum

Font Line Parallel Circle Rectangle


I disconnect the front fuel line from the quick disconnect with yellow tabs. Attach a 3/8" rubber tube to the metal tube and run it into a gas can.

I checked for continuity and found continuity across 30 and 87a with resistance across 85 and 86. Everything checks out! So I disconnect negative battery terminal, stick in a paperclip, mistakenly across 87 and 87a, reconnect battery terminal, turn key to 'On' and nothing. I realize my mistake and repeat the process but this time, paperclip is across 30 and 87. Key to 'On' and still nothing.

To make sure I connected to the correct fuel line, I disconnect the other quick disconnect with yellow tabs and put a cup under that, turned my key to 'On' hoping it would prime, but nothing happens. I leave both tubes disconnected and jump pins 30 and 87 again, and nothing comes out of either tube.

Am I doing this wrong?

Alternatively, I have about 1/8 of a tank of gas left, if I can't get the gas drained, I may end up filling the remaining 3/4 tank with 91 octane gas, hoping it would slosh around and normalize enough to drive.

Your thoughts?

Thank you.
 

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Discussion Starter · #3 ·
Hi there. Thank you for the response and your hospitality.

As for your question, I don't recall hearing the pump activate. I read elsewhere that I may turn on the fuel pump by jumping the Open Circuit Relay. I just didn't want to bypass all sorts of relays before I asked some questions.

Thank you.
 

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Discussion Starter · #5 ·
Well thank god I'm not the only one stumped by this. I do appreciate you helping. If I can find the relay pin out for the Circuit Opening Relay, I would definitely try that and report back. I think I read somewhere else to take B+ to FP(??) I forget.

Short of dropping the fuel tank. Do you recommend a different method of draining the fuel tank? What are your thoughts of me filling my tank with 91 octane and just starting it with 1/8 tank of expired gas in the tank?

Thank you
 

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Discussion Starter · #7 · (Edited)
The thought had crossed my mind and it worried me quite a bit. However I bridged 87 to 87a, according to the pin diagram, it basically bridged between 2 potential gate positions. Normally open to normally closed. And the resistor was not in place as I used the paperclip to bridge a makeshift closed switch. The relay was removed throughout that process. With you confirming that the fuel pump does not prime with the key in the 'On' position, I'm further comforted in knowing the fuel pump may not be fried.

I read resistor as relay....when i said resistor in my above post, I really meant relay.

With this new information, where and which resistor may I have fried?
 

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Discussion Starter · #9 ·
Hmmm...I see that resistor. Where would it physically be? How can I test it? And how would I turn it on to drain the gas tank?

Thank you for your help.
 

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Discussion Starter · #11 ·
Thank you for your help. I'll look at the resistor and hope it hasn't failed. If the relay diagram is correct, big if, but I've cross checked with many different diagrams, I'm still uncertain how bridging pin 87 to 87a would cause a short. I've looked for the Fuel Pump fuse and could not find it, unless it's buried/bundled with another accessory.
 
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