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08-12-2017, 10:51 PM
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#1 |
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Registered User
 
Join Date: Feb 2016
Location: Maryville, TN
Posts: 44
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Installed '90 GM Factory EFI tank, '72 Blazer Factory fuel gauge is pegged past full?
Installed '90 GM Factory EFI tank, '72 Blazer Factory gas gauge is pegged past full and not working? I know the ohms are the same, just curious if anyone else has run into this problem, and how I can fix it. I did the swap to use with my Holley Sniper EFI, but really want to keep the factory gauges. Thanks in advance.
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08-12-2017, 11:21 PM
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#2 |
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Senior Member
Join Date: Oct 2012
Location: Miami, Florida
Posts: 959
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Re: Installed '90 GM Factory EFI tank, '72 Blazer Factory fuel gauge is pegged past f
hello Okie528. I have had this happen to me before. Check the wiring. make sure you have the correct fuel wire hooked up. In my case, I had the fuel sending unit wiring hooked up wrong. I hope you have an easy fix. Good luck, Clark.
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08-12-2017, 11:55 PM
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#3 |
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Post Whore
 
Join Date: May 2015
Location: Alabama
Posts: 14,671
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Re: Installed '90 GM Factory EFI tank, '72 Blazer Factory fuel gauge is pegged past f
might want to pull the float/sender out of tank and make sure the floats not stuck...
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08-13-2017, 06:47 PM
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#4 |
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Registered User
Join Date: Feb 2016
Location: Maryville, TN
Posts: 44
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Re: Installed '90 GM Factory EFI tank, '72 Blazer Factory fuel gauge is pegged past f
Ok, ground is good. My sending unit is a four wire (Gray wire - Fuel pump power, Purple - Sending unit hooked to my tan sending unit wire, Black w/white stripe-I assume ground, then another black wire-ground. I have the both the black and black with white stripe grounded to the same spot. Does this shed any light to my problem?
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10-19-2019, 11:30 PM
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#5 |
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Registered User
Join Date: Nov 2018
Location: California
Posts: 12
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Re: Installed '90 GM Factory EFI tank, '72 Blazer Factory fuel gauge is pegged past f
Hey Okie, I know this thread is old but, just curious where you purchased your Blazer fuel tank from? Is the fuel fill on the driver's side?
__________________
- Snowman 1973 GMC K2500 Sierra Grande |
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10-20-2019, 06:58 PM
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#6 |
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Registered User
Join Date: May 2012
Location: horseheads,ny rust belt
Posts: 2,794
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Re: Installed '90 GM Factory EFI tank, '72 Blazer Factory fuel gauge is pegged past f
did you ground the sender ground wire to the FRAME ?
this will get you a bad over full pegged needle . also did you swap in a bigger psi / flow pump to feed the higher psi required sniper ? i did a ep381 acdelco unit direct plug and play swap . worked for my super short run with the sniper and been great with the edelbrock pro flo 4 now no problems .
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77-k30lb BIG truck build . 87-k30lb budget beater build . 85-k30lb the plow machine build . 85-c10sb summer fun toy . ----------------------------- HOLLEY SNIPER efi = worst case of p.i.t.a i ever had . EDELBROCK pro flo 4 = best deal going so far . love my setup works great. |
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10-21-2019, 08:44 AM
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#7 | |
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Senior Member
Join Date: Nov 2013
Location: East Tennessee
Posts: 2,199
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Re: Installed '90 GM Factory EFI tank, '72 Blazer Factory fuel gauge is pegged past f
Quote:
Looking through his receipts...the fuel tank is a Spectra GM-14G specs out for a 1991 C3500 I know that he went through ordering and returning a couple of different tanks before he found that one....the first tanks did not have a baffle surrounding the pump. The fill is in the stock location It did require some modifications to the rear cross members...not sure of the exact details but I can look if you'd like
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1967 C10 Step side 1968 C10 Step side 1970 Chevrolet K/5 Blazer 1972 Chevrolet K/5 Blazer ............. 
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10-22-2019, 11:27 AM
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#8 |
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Account Suspended
Join Date: Jun 2015
Location: No longer here
Posts: 1,000
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Re: Installed '90 GM Factory EFI tank, '72 Blazer Factory fuel gauge is pegged past f
Wow !!! Thanks !!!! Even WOODCHUCKs TRUCKs was tiring to help..... LOL!!!!
Last edited by YoungPup1977; 10-22-2019 at 11:42 AM. |
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10-22-2019, 12:35 PM
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#9 | |
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Senior Member
Join Date: Nov 2013
Location: East Tennessee
Posts: 2,199
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Re: Installed '90 GM Factory EFI tank, '72 Blazer Factory fuel gauge is pegged past f
Quote:
__________________
1967 C10 Step side 1968 C10 Step side 1970 Chevrolet K/5 Blazer 1972 Chevrolet K/5 Blazer .............
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