New in tank fuel pump not working - The 1947 - Present Chevrolet & GMC Truck Message Board Network

faribran · 06-18-2014, 06:03 PM

Anyone ever have problems with a in tank pump not priming?
This is a new tank as well as new pump. it has worked about 4 -6 months ago.
Now when the key is turned on you can hear the relay click on then click off.

I checked, with meter, 12.5 volts going to the wire just outside tank.

Any suggestions short of dropping the tank and pulling the pump?

Yes this is an LS1 conversion.

Tks
Rich

BR3W CITY · 06-18-2014, 07:10 PM

Pop a different relay in, just to be sure. You can swap that back out, takes 20 seconds.

Then I'd look at the external ground if you have one. After those two easy steps, its pulling the pump out. Are you using the ECM trigger for the fuel pump, or a hotwire of switched +12v?

iirc on the relay its
30- 12v constant
85- ground
87- power to pump
86- fuel pump relay control

If you try to start it, what happens? Is there any change in voltage on the power wire?

faribran · 06-18-2014, 10:45 PM

ECM trigger, thanks

faribran · 06-26-2014, 06:29 PM

Ok, I dropped the tank today, will pull the pump out tomorrow. Any one have suggestions on how to free up this pump?

BR3W CITY · 06-27-2014, 12:47 AM

Quote:

Originally Posted by faribran

Ok, I dropped the tank today, will pull the pump out tomorrow. Any one have suggestions on how to free up this pump?

Depends if its stuck from sucking something in, or if it arc'd itself.

faribran · 06-28-2014, 12:22 AM

I am out of town for the weekend (Mobile, AL). Should pull the pump Monday.
I did notice it is retained by typical locking ring. I have a spare pump in a 2002 silverado.
But this one I am pulling out is basically a new tank and new pump, bought from Spectre Premium. Oh well, will see in a couple of days.

Thanks BR3W

BR3W CITY · 06-28-2014, 10:37 AM

NP

Just try and run the pump once in a bucket or something outside of the truck, just to make sure your not junking a good pump.

smoky02 · 06-29-2014, 03:07 AM

I hope the pump isn't bad...that definitely wouldn't Bode well for Spectra premium

**truckdude239** · 06-29-2014, 12:21 PM

i used a spectra premium tank and sender unit in mine but i used an ac/deco ep381 pump in my sender just couldn't bring my self to trust there pumps

faribran · 06-29-2014, 09:17 PM

David,
Was your tank made for the F/I pump or did you have to modify? Does it have baffles? Also, tell me about the wiring hook up.
TSS
Rich

faribran · 07-16-2014, 07:07 PM

Ok, I took the pump out. Soaked it in pb blaster for a few days. Tested it..it works. Just got finished putting it back into tank and putting the tank back up. Seems to work as it should.

Thanks everyone

smoky02 · 07-17-2014, 08:53 AM

That's awesome...glad cleaning it out did the trick.

faribran · 07-18-2014, 12:16 PM

Thanks bud

06-18-2014, 06:03 PM	#1
faribran Registered User Join Date: Jul 2005 Location: AL Posts: 1,828	New in tank fuel pump not working Anyone ever have problems with a in tank pump not priming? This is a new tank as well as new pump. it has worked about 4 -6 months ago. Now when the key is turned on you can hear the relay click on then click off. I checked, with meter, 12.5 volts going to the wire just outside tank. Any suggestions short of dropping the tank and pulling the pump? Yes this is an LS1 conversion. Tks Rich __________________ "

06-18-2014, 07:10 PM	#2
BR3W CITY meowMEOWmeowMEOW Join Date: Sep 2009 Location: MKE WI Posts: 7,128	Re: New in tank fuel pump not working Pop a different relay in, just to be sure. You can swap that back out, takes 20 seconds. Then I'd look at the external ground if you have one. After those two easy steps, its pulling the pump out. Are you using the ECM trigger for the fuel pump, or a hotwire of switched +12v? iirc on the relay its 30- 12v constant 85- ground 87- power to pump 86- fuel pump relay control If you try to start it, what happens? Is there any change in voltage on the power wire? __________________ *'66 Short Step / SD Tuned / Big Cam LQ4 / Backhalfed /Built 4l80e / #REBUILDEVERYTHING* MY BUILD THE H8RDCPTR //\\ MY YOUTUBE CHANNEL REV J HD

06-18-2014, 10:45 PM	#3
faribran Registered User Join Date: Jul 2005 Location: AL Posts: 1,828	Re: New in tank fuel pump not working ECM trigger, thanks __________________ "

06-26-2014, 06:29 PM	#4
faribran Registered User Join Date: Jul 2005 Location: AL Posts: 1,828	Re: New in tank fuel pump not working Ok, I dropped the tank today, will pull the pump out tomorrow. Any one have suggestions on how to free up this pump? __________________ "

06-28-2014, 12:22 AM	#6
faribran Registered User Join Date: Jul 2005 Location: AL Posts: 1,828	Re: New in tank fuel pump not working I am out of town for the weekend (Mobile, AL). Should pull the pump Monday. I did notice it is retained by typical locking ring. I have a spare pump in a 2002 silverado. But this one I am pulling out is basically a new tank and new pump, bought from Spectre Premium. Oh well, will see in a couple of days. Thanks BR3W __________________ "

06-28-2014, 10:37 AM	#7
BR3W CITY meowMEOWmeowMEOW Join Date: Sep 2009 Location: MKE WI Posts: 7,128	Re: New in tank fuel pump not working NP Just try and run the pump once in a bucket or something outside of the truck, just to make sure your not junking a good pump. __________________ *'66 Short Step / SD Tuned / Big Cam LQ4 / Backhalfed /Built 4l80e / #REBUILDEVERYTHING* MY BUILD THE H8RDCPTR //\\ MY YOUTUBE CHANNEL REV J HD

06-29-2014, 03:07 AM	#8
smoky02 Registered User Join Date: Oct 2003 Location: Sunny, Florida, some might call it South Alabama Posts: 834	Re: New in tank fuel pump not working I hope the pump isn't bad...that definitely wouldn't Bode well for Spectra premium __________________ Just sold my C10...sad day... Looking for a 1972 Blazer to hopefully fill the hole in my heart.

06-29-2014, 12:21 PM	#9
truckdude239 Senior Member Join Date: Sep 2005 Location: Lewisville, Nc Posts: 10,237	Re: New in tank fuel pump not working i used a spectra premium tank and sender unit in mine but i used an ac/deco ep381 pump in my sender just couldn't bring my self to trust there pumps __________________ David fuller Ase Certified Mechanic Click here to help support our board!! 1971 Chevy c-10 under going a 4.8l LSx swap Build Thread http://67-72chevytrucks.com/vboard/s...d.php?t=421305 2007 Honda Accord my daily 145kmiles 2002 Honda Accord 4 door With 330k(sisters car) 2005 toyota Avalon 228k( brothers car) 2002 Sububran 5.3 245k 2000 Tahoe 5.3l 378 General manager for Marco's Carwash & lube

06-29-2014, 09:17 PM	#10
faribran Registered User Join Date: Jul 2005 Location: AL Posts: 1,828	Re: New in tank fuel pump not working David, Was your tank made for the F/I pump or did you have to modify? Does it have baffles? Also, tell me about the wiring hook up. TSS Rich __________________ "

07-16-2014, 07:07 PM	#11
faribran Registered User Join Date: Jul 2005 Location: AL Posts: 1,828	Re: New in tank fuel pump not working Ok, I took the pump out. Soaked it in pb blaster for a few days. Tested it..it works. Just got finished putting it back into tank and putting the tank back up. Seems to work as it should. Thanks everyone __________________ "

07-17-2014, 08:53 AM	#12
smoky02 Registered User Join Date: Oct 2003 Location: Sunny, Florida, some might call it South Alabama Posts: 834	Re: New in tank fuel pump not working That's awesome...glad cleaning it out did the trick. __________________ Just sold my C10...sad day... Looking for a 1972 Blazer to hopefully fill the hole in my heart.

07-18-2014, 12:16 PM	#13
faribran Registered User Join Date: Jul 2005 Location: AL Posts: 1,828	Re: New in tank fuel pump not working Thanks bud __________________ "

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