OK fuel system question 1988 blazer - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Srubydo1986 · 12-17-2007, 10:31 AM

Im working on my cousins 1988 k5 blazer 4x4 it has the tbi set up and she not gettting fuel to the system. My first thought it fuel pump in the tank, which is still an option becasue i can not hear it running. UN screwed fuel turn truck on and got no fuel. But im looking for one thing before i go dropping this tank.. Where is the fuel pump relay (autozone sells it but i have no idea where its sitting. also if there is a fuse for the pump anywhere.

IM at a loss all my trucks are mechanical and only had one like this and never had a issue from it any help would be great thanks.

Plumbnutz · 12-18-2007, 07:26 AM

The fuel pump relay is mounted high on the firewall to the right of retractable light, just left (passenger side) of the center of engine compartment. The tranny dipstick is just below the relay. If your vehicle has a THM 400 then there will be 2 relays located there, one is the downshift relay and the other is the fuel pump relay.

Hope that helps.

12-17-2007, 10:31 AM	#1
Srubydo1986 The Crazy Machanic Join Date: Jan 2007 Location: Nokesville Va Posts: 1,437	OK fuel system question 1988 blazer Im working on my cousins 1988 k5 blazer 4x4 it has the tbi set up and she not gettting fuel to the system. My first thought it fuel pump in the tank, which is still an option becasue i can not hear it running. UN screwed fuel turn truck on and got no fuel. But im looking for one thing before i go dropping this tank.. Where is the fuel pump relay (autozone sells it but i have no idea where its sitting. also if there is a fuse for the pump anywhere. IM at a loss all my trucks are mechanical and only had one like this and never had a issue from it any help would be great thanks. __________________ 1986 Sliverado longbed 400 small block mean as hell, 700r4 trans (5 speed coming one day) 1970 chevelle 2dr sedan Latest update June 24 2007. *1957 4 door stationwagon - pink all original needing a good restore (body great, floors bad) newest additions 1965 shortbed fleet great granddads. Been told im nuts to bring it back from the dead (still going to happen) plans-all stock with a turbo 292 inline 3 speed column shift. and thats it big block 427 and 5 speed trans and ford 9 inch theyhave no home yet thinking what to put them in and a 79 c60 trash truck um no idea i have one

12-18-2007, 07:26 AM	#2
Plumbnutz Registered User Join Date: Nov 2007 Location: Oregon Posts: 21	Re: OK fuel system question 1988 blazer The fuel pump relay is mounted high on the firewall to the right of retractable light, just left (passenger side) of the center of engine compartment. The tranny dipstick is just below the relay. If your vehicle has a THM 400 then there will be 2 relays located there, one is the downshift relay and the other is the fuel pump relay. Hope that helps. __________________ 74 K5 Blazer-built 350ci,Turbo 350, NP 205 8 lug Dana 44, GM Corp 14 bolt-4.56 gears, 37" Boggers 89 K5 Blazer-TBI 350, 700r4, NP 208 8 lug Dana 44, GM Corp 14 bolt-4.10 gears, 33" Toyo A/T



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