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02-10-2015, 06:13 PM
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#1 |
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Registered User
Join Date: Sep 2010
Location: Waco,Texas
Posts: 143
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1987 fuel tank(s) ??
Puting 5.3 into 1987 C10 with dual tanks. My question is this, the original 1987 pcm should still control the tank selector valve and the fuel pumps coming on in the tanks. If so, the fuel pump wire on the ls harness will go where?
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02-12-2015, 12:08 AM
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#2 |
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Addicted to Rust
 
Join Date: Dec 2009
Location: Abbeville SC
Posts: 1,030
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Re: 1987 fuel tank(s) ??
Its all controlled by the switch. One side, (gray ) controls the pump and valve and Tan controls the meters. The 87 pcm went to the relay. relay to pump side of switch. I had to add an additional relay to isolate the switch because the Walbro pumps cooked the switch. The colors may be different its been a while since I looked at those wires. 20k miles and counting on my 87 GMC with a 5.3. Jay
__________________
Current trucks: (48 GMC100 320 inliner) Gone (48 Suburban in pieces) Sold 87 GMC CCSB 5.3 4l60E Daily Driver ECTA National record holder XO/PP We never really grow up, we just learn how to act in public. |
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11-02-2016, 07:58 PM
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#3 |
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Registered User
Join Date: Apr 2016
Location: Miramar Florida
Posts: 153
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Re: 1987 fuel tank(s) ??
I Just Got An 87 Chevy With Fac. Duel Tanks In It One On The Right & one on The Left Side
The One On The Right Works Great The One On The Left Don't Do Nothing When I Flip The Switch And The B ECM Fuse Is Good Any Help Would Be Greatly Appreciated Thank You Thank You Harley03joe   
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11-04-2016, 02:29 PM
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#4 |
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Registered User
Join Date: Aug 2011
Location: Tobaccoville,NC
Posts: 23
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Re: 1987 fuel tank(s) ??
Harley03joe, assuming that you don't have an electrical problem, it may be that the short 2 inch long hose connecting the sending unit and the fuel pump has turned to mush. I replaced mine 4 yrs ago and just had to replace both sides again. That 10% ethanol gas is torture on fuel lines. Now "submersible fuel injection hose" is available. For 1 foot the price is $29.99. I have a 87 with dual tanks that I changed to an 04 5.3LS four yrs ago and at that time changed fuel pumps to the Walbro. The bed of my truck has been off so many times, I used wing nuts the last time to secure it.
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87 Silverado 5.3/4L60E 3.42 91 Silverado 4X4 350/700R4 88 Silverado CrewCab Dually 454/TH400 - sold 81 Camaro 350/4 speed ROC (ruff old car) 02 Camaro SS LS1/T56 13 Dodge Charger Hemi (state surplus patrol car) |
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11-06-2016, 07:33 PM
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#5 | |
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Registered User
Join Date: Apr 2016
Location: Miramar Florida
Posts: 153
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Re: 1987 fuel tank(s) ??
Quote:
Now For Ethanol I Use K 100 By Kinetic Fuel Technology,Inc You Can Buy It On E-bay About $20.00 For 32 Fl Oz Treats 64 Gal Great Stuff And Look On There Sight It Will Burn Water  Thanks Again For Your Info Question Do You Have Any Pictures Of The Hose Or The Connector I Just Bought A 5 Book Set Of Repair Manuals On E-bay For $80.00 It Was A Great Find 1987 Chevy Light Medium Duty Truck Pickup Service Shop Manual 5 Book Set 10-30 & FREE SHIPPING Great Deal Thanks For Being Here Harley03joe
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11-07-2016, 02:34 PM
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#6 |
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BMW & ASE Master Certified
Join Date: Feb 2004
Location: Houston, Texas
Posts: 1,256
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Re: 1987 fuel tank(s) ??
Can the factory selector valve handle 58 psi? Factory tbi fuel pressure is like 14-15psi..
Clint
__________________
1987 Silverado - L83 5.3 w/ 6L80e ,A/C,P/W,P/L,TILT, HID projectors, Wilwood C-10 Pro Spindles w/ 2018 silverado front brakes & C-5 Corvette Rear Disc Brakes 1999 BMW 528i - 5.7 LS1 w/ 4l60e, Ford 8.8 IRS w31 spline posi & FX-r projector retrofit New project: 2006 BMW x5 6cyl AWD to L83 6l80e 4wd to 2WD / RWD A poor man buy's it twice finally got my domain name back, 87chevy.com.... site rework in progress |
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11-07-2016, 11:16 PM
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#7 | |
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Addicted to Rust
Join Date: Dec 2009
Location: Abbeville SC
Posts: 1,030
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Re: 1987 fuel tank(s) ??
Quote:
__________________
Current trucks: (48 GMC100 320 inliner) Gone (48 Suburban in pieces) Sold 87 GMC CCSB 5.3 4l60E Daily Driver ECTA National record holder XO/PP We never really grow up, we just learn how to act in public. |
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11-12-2016, 03:45 AM
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#8 | |
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Registered User
Join Date: Apr 2016
Location: Miramar Florida
Posts: 153
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Re: 1987 fuel tank(s) ??
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I Replaced The Dash Switch No Go >>Next I'm Going To Look At That Short Hose, And Replace Both Fuel Filters & If So Replace The Selector Valve Under The Truck What Is The Best Brand A/C Or Pollak Or Standard ????? 6 Port Any Part # Would Help Me Out The Truck Has 2 Factory Fuel Tanks Its An 87 R 10 SHORT BED , I Just Love This Truck, Its Clean Clean Clean Thanks White Harley03joe
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