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Old 04-05-2010, 12:04 AM   #1
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no power to fuel pump

Getting no electrical power to fuel pump, checked all fuses, open relay behide glovebox, maybe another relay? All started with truck stalling and blowing the efi 15amp fuse.....now fuel pump no power prob??? 1986 toyota 4x4 22re 210,000 miles thanks for this forum!!!! Rusted Rooster. (checked 02 censor wire,it was ok)
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Old 04-05-2010, 03:32 AM   #2
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check the main relay .Also, Make sure your o2 sensor wire isn't touching the exhaust manifold it can cause the efi fuse to blow ,check all grounds. and connections .

Last edited by bipolarandproud; 04-05-2010 at 04:04 AM.
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Old 04-05-2010, 05:14 PM   #3
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Thanks Bipolarandproud, I will check grounds, already checked 02 censor,its not touching exhaust, When efi fuse blew, put 40amp fuse in place of 15amp to get home, still would not start,after cranking it 5 secs i checked fuse, it was RED-HOT so i stopped afraid of burning wires, hoping its a relay, kind of guessing now. thank you again for reply,
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Old 04-05-2010, 05:20 PM   #4
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Alrighty , post your results.
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Old 04-07-2010, 05:05 PM   #5
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Is main relay the same as the open relay? behind pass-side speaker I changed that one
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Old 04-07-2010, 05:15 PM   #6
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No it isn't, it is in the driver side fuse box . It is a gray circular relay located at the very bottom of the fuse box.
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Old 04-08-2010, 01:23 AM   #7
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Thank you!
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Old 04-08-2010, 02:00 AM   #8
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do you have power to cor relay * behind glove box*? the afm sends the Run signal to the cor and the cor then sends power to the fuel pump. Have you tried putting power direct to the fuel pump? You need to find why the efi fuse blew. Remove that 40 amp and replace with the recomended 15!!! You're gonna fry your computer! or burn up your truck. Have you verified spark yet?
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Old 04-08-2010, 05:15 PM   #9
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Thank you, for post I only left 40 amp fuse in for 5 sec,,,,,that is the open relay behind glove box? where and what is the afm? it will start with starting fluid but stops when starting fluid burns off...running stright wire to fuel pump afriad of spark by tank? have not blown efi fuse again yet just cranking and running a little
can i run a wire off iginition hot wire to fuel pump? or what color is + fuel pump wire off iginition? maybe i can test light it from there? sorry for all the ???? thanks again
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Old 04-10-2010, 01:12 PM   #10
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i had this same problem do not continue putting fuses in. Under your driver side door a wiring harness runs around the stock running board mount. Very close to where it goes from under your seat through the floor of your truck. check that for cuts and a short circut.
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Old 04-10-2010, 05:55 PM   #11
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you can run a jumper from the ignition to your fuel pump but it wont do any good. im going through this exact same issue at the moment. check the black wire coming off your starter for rub spots and what not. mine will start and die just like yours. i have replaced the efi relay. cor and replaced nearly all wiring with no results. you can hook a test light up to the upper left wire on the cor and hook it to ground, that wire runs directly to the fuel pump. if you have power there then its not the pump because until you unhook the ground the fuel pump will continue to run
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Old 04-11-2010, 04:50 AM   #12
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hi thanks
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Old 04-11-2010, 04:55 AM   #13
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thanks for the post. I found out I was not getting power to my open relay so I changed efi relay behind driver's side kick panel. Changed open relay also behind glove box. Now I have power to fuel pump harnest, but as soon as I hook fuel pump harnest to fuel pump I blow the 15amp efi fuse. Sounds like the fuel pump is my problem. Any suggestions would be great. This all started when I went over railroad crossing. And the truck died from blowing efi fuse. 1986 4x4 22re
Thanks again, Rusted Rooster
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Old 04-11-2010, 09:53 AM   #14
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Alright i dont know if this makes any sense. but in the process of checking my cold start injector. i unplugged it and hooked a test light up from the injector plug to the negative on my battery and mine took off. havent had problems since. might try it and see what happens
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Old 04-12-2010, 04:43 PM   #15
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Worked on truck for two hours tonight. Pulled fuel pump and bench tested, it runs and sounds fine. Had 15amp fuse on positive wire it never blew with bench test. So it's not the fuel pump? I am getting power to fuel pump harnest with jumper wire and key on but if I unhook the jumper wire, there is no power to fuel pump harnest. Like I said before efi 15amp fuse blows when I hook up fuel pump harnest to fuel pump. Any help would be great! Not sure where to go next?
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Old 04-13-2010, 01:26 AM   #16
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What exactly does jumping fuel pump do? what is being by-passed?
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Old 04-14-2010, 05:14 PM   #17
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Well, got her started...not totaly sure what I did ? will start with what I did last 2 days
#1 removed fuel pump, bench tested-good.
#2 replaced + and - wire prongs on fuel pump bracket (they broke off to touch, rusted)
#3 replaced fuel pump
#4 pulled,checked,wiggled,inspectded,any harness,rechecked 02 censor.
#5 added extra ground wire from motor to truck body(not sure why)
#6 unhooked air flow meter, hooked back up,
#7 replaced 15amp efi fuse,turned key and started up, runs fine, starts fine, not blowing efi fuse yet, have to lower bed back down,bolt it down, and take her for a test drive,
thanks for all who posted! Rossted Rooster.
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Old 04-14-2010, 05:31 PM   #18
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That's great news!
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Old 04-15-2010, 03:12 AM   #19
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afm is air flow meter. Hopefully you got it.
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Old 12-24-2011, 04:14 PM   #20
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just wanna add... that....

Dunno..... But, since you benched it sounds like a short somewhere else and should start with that harness if you cn check for shorts there or wires rubbing and work back or out of that area to the next. Not much ... but, thought I'd just say to try and help.

86Dyota

P.S. I don't wanna giver up. It only has @100K and I will try to run it and save some miles on my car.....or sell it!....later.

Last edited by 86dyota; 12-24-2011 at 04:17 PM. Reason: P.S.
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22re, 93, c10, chevrolet, chevy, crossed, efi, electrical, fries, fuel, power, pump, relay, toyota, wires

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