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muckster
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Jan 8, 2012, 1:23 PM
Post #1 of 20
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no fuel at injectors !!!
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hello an thank you in advance!!!! have to bypass fuel relay for theres no power to the fuel pump when key is turn on....... no codes to read been disconected for some time..... had to replace tank an pump,fuel gauge is bad also.. getting fuel to the tb but no fuel will come out other than a drip...... filters are clean!! i am only getting 2 plus volts on the going to the pump ,that is why i've bypassed the relay..... check eng. light goes out after cranking on it for a min. then you can hear a click in the dash when the light comes back on............... im totally lost!!!!
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Hammer Time
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Jan 8, 2012, 1:35 PM
Post #2 of 20
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Re: no fuel at injectors !!!
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No, you need to undo that bypass ASAP. You can't do that.
Do you even understand when to expect the pump to be powered and when it shouldn't?
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muckster
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Jan 8, 2012, 1:53 PM
Post #3 of 20
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Re: no fuel at injectors !!!
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 yes i do !! every thing was bone dry , new tank , new pump had been setting for about 3 to 4 years an 88 s-10 blazer , but yes i do need help!!
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Hammer Time
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Jan 8, 2012, 1:55 PM
Post #4 of 20
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Re: no fuel at injectors !!!
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OK, what sequence of steps are you taking to test for power at the pump?
PS: don't create duplicate questions
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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
(This post was edited by Hammer Time on Jan 8, 2012, 1:56 PM)
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muckster
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Jan 8, 2012, 2:00 PM
Post #5 of 20
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Re: no fuel at injectors !!!
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im unplugging the wire going to the pump an sender, hooking up a volt meter and haveing an assistance turn the key on
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Hammer Time
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Jan 8, 2012, 2:04 PM
Post #6 of 20
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Re: no fuel at injectors !!!
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Then you are aware that it only powers for 2 seconds that way?
You are going to have to do your testing at the relay using a computer safe testlight to determine which signal if any is missing.
What is the 8th digit of the VIN#?
Will it run if you pour a little fuel down the throttle body?
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muckster
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Jan 8, 2012, 2:14 PM
Post #7 of 20
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Re: no fuel at injectors !!!
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i believe its an 0 , it will run if you pour a little fuel
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Hammer Time
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Jan 8, 2012, 2:22 PM
Post #8 of 20
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Re: no fuel at injectors !!!
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No, it's not an 0
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muckster
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Jan 8, 2012, 2:30 PM
Post #9 of 20
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Re: no fuel at injectors !!!
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 R sound more like it ? im bout half blind too LOL!!! it will run if you pour alittle down its throat!!
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Hammer Time
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Jan 8, 2012, 2:52 PM
Post #10 of 20
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Re: no fuel at injectors !!!
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OK, so this is a 2.5.
Now, first check the ECM B fuse. What is odd here is that this truck has a duplicate fuel pump power supply through the oil pressure switch so it should run even without a relay.
Test at the relay socket. You should have power all the time on the orange wire.You should have ground all the time on the blk/wht wire. You should have power on the dk grn/wht wire for 2 seconds when key turned on and again when cranking. The tan/wht wire is the output.
Test that and see what is missing from the relay.
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muckster
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Jan 9, 2012, 4:32 PM
Post #11 of 20
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Re: no fuel at injectors !!!
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Hello Hammer, sorry for not replying ,had a glich with the lapm top,an had to go. It pleases my heart that there are people such as you that reALLY KNOWS WHATS GOING ON!! there are two oil presure switches , back up for a moment there's a sticker saying 2.8 on the orng,theres 11 plus volts, the grn. 8.pls for a second or two then goes up to10 when cranking , the tan&wht only a .10 tenth of a volt
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Hammer Time
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Jan 9, 2012, 4:39 PM
Post #12 of 20
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Re: no fuel at injectors !!!
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I don't understand what you are saying here. First, did you test the ECM B fuse? That powers the orange wire so if you have no power on orange, then that fuse is blown or there is a wiring problem between the fuse and the relay on that orange wire. You should be testing all but the output with the relay removed.
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muckster
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Jan 9, 2012, 8:26 PM
Post #13 of 20
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Re: no fuel at injectors !!!
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yes there is 11 volts on the orng wire, there is power briefly on the grn&wht of 8 to 10 volts , the tan an wht wire only has .10 a tenth of a volt the fuse is good!!! i check these with the relay in,i'll have to go back an check these with the relay removed. please forgive me , i've been in an out of the shop ,this is the cause of the delay of my answering. tomorrow i'll repeat this test. thank you for haveing da time to answering me!!
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Hammer Time
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Jan 10, 2012, 3:59 AM
Post #14 of 20
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Re: no fuel at injectors !!!
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OK, it's getting power supply and trigger power from the computer. Verify that you have ground on Blk/wht wire. If you do have ground, and still no output on the tan/wht , then you just have a bad relay.
That brief power on the grn/wht should be full battery voltage coming from the computer.
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
(This post was edited by Hammer Time on Jan 10, 2012, 4:00 AM)
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muckster
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Jan 10, 2012, 12:17 PM
Post #15 of 20
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Re: no fuel at injectors !!!
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1-10-12 I TRYED that same test this mourning and im not getting nothing..............first time ,i had power on the orng. wire ,now there's nothing!1 first time had 8. volts on the grn. wire for a couple of seconds, now theres nothing , first time only had a .10 a tenth of a volt, now there's nothing .............. i check the fuse a second time and its still good,though when i pull it out and replace it the oil gauge peg's out,then after trying to crank it will drop to nothing..............change relay switch still nothing no where!!!
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Hammer Time
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Jan 10, 2012, 1:56 PM
Post #16 of 20
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Re: no fuel at injectors !!!
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Of course changing the relay won't help if you have no power to it. The orange wire HAS to have power. Just for kicks, try jumping power directly to the orange wire and see if it starts.
I'm suspecting that you have a connector somewhere that is not making a good contact.
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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
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muckster
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Jan 10, 2012, 3:38 PM
Post #17 of 20
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Re: no fuel at injectors !!!
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Hey hammer, now bout 4 years back my drive shaft grabbed the oil wires an tore hboth of them in half before i parked it ,i connected them back with soldder-less connectors,but i never had no trouble out of them till maybe now. i had check them with every-thing else recently here an all seemed to have power to them. could you tell me which connectyor i should start with,they all have been pulled an put back ,an they all looked clean an tight. thank you for bareing with me.
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Hammer Time
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Jan 10, 2012, 3:58 PM
Post #18 of 20
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Re: no fuel at injectors !!!
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First try the test I suggested.
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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
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muckster
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Jan 10, 2012, 4:04 PM
Post #19 of 20
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Re: no fuel at injectors !!!
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ok !! gotta go again............. thank you!!
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Hammer Time
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Jan 10, 2012, 4:31 PM
Post #20 of 20
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Re: no fuel at injectors !!!
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I don't have exact locations but that wire leaves the fuse box and passes through a connector and then goes to a 4 wire splice. You're problem is going to be in one of those 2 places.
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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
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