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97 Blazer Fuel Pump Problem
by danlucente
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Aug 25, 2006 (1:11 pm)
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I am having problems with the fuel pump on my 97 Blazer. I am not getting the whinning noise when turing the ignition on. I have checked the relays, they are clicking, but not getting power to the fuel pump. I verified this by disconnecting the plug form the fuel pump and checking the 12 line, I get nothing.
This happened the other night also. I was working on a problem I had with the trailer wiring, and I believe the problem came from leaving the ignition on too long.
Anyone have any ideas on what to check next??? I am stumped.
Thanks
Dano
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- #2 of 100
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Re: 97 Blazer Fuel Pump Problem [danlucente]
by penizzle
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Aug 26, 2006 (5:06 pm)
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Replying to: danlucente (Aug 25, 2006 1:11 pm)
just because the relays are clicking doesnt mean that they are good. Put in a new fuse and relay and give it a try.
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- #3 of 100
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Re: 97 Blazer Fuel Pump Problem [penizzle]
by repairdog
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Aug 28, 2006 (1:33 am)
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Replying to: penizzle (Aug 26, 2006 5:06 pm)
You can switch relays with the same # in the underhood box and retry also. Pump only comes on for 2 sec as you turn key on to pressurize - need to put a pressure tester on at the fuel rail (Actron sold at most stores for under $40) and see what pressure if any really there. If when you put the key in and turn to run the security light should go out after 5 sec - if its blinking you acivated passlock.
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- #4 of 100
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98 blazer won't start
by skippybob
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Sep 16, 2006 (1:26 pm)
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I didn't hear the fuel pump come on when key is on so I assumed pump was shot. Replaced pump , relay, still no buzz from the pump. I don't have a fuel pressure guage, but at the port on the fuel line right behind carb, if you press it in you should have fuel spurt out,right? Also, at the 4-pin connector on the pump, I have 5 volts on purple wire, good ground on 2 black wires. What should the gray wire do?
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- #5 of 100
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Re: 98 blazer won't start [skippybob]
by repairdog
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Sep 17, 2006 (4:24 am)
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Replying to: skippybob (Sep 16, 2006 1:26 pm)
Per the Haynes diagram for a typical V6 CPI the black is ground, the purple is the sender unit to the gage, and gray is the hot from the relay. There are 2 parallel paths for gray, 1 thru the fuel pump relay and 1 thru the oil pressure switch and both run thru the ECM fuse. Check the fuses. Input to relay shows black/white ground and dark green/white ign hot to energize the relay and then orange feeds hot thru from the ECM fuse to gray. Caution - your colors could be different - this was the typical wiring diagram - best I have. Post back when you get it going so others know.
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- #6 of 100
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1992 blazer fuel problem
by morgan420
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Sep 27, 2006 (10:36 am)
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H i i have a 92 s10 blazer and its a fuel problem. i have replaced fuel pump, fuel filter, and the cmfi unit, "you know the little spider thing". And now it will run for like 15 20 minuts and then it just shuts down some where. Please anybody can you help me.
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- #7 of 100
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Re: 1992 blazer fuel problem [morgan420]
by repairdog
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Sep 27, 2006 (11:40 am)
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Replying to: morgan420 (Sep 27, 2006 10:36 am)
Replace the fuel pump relay or switch with one the same # and see if its that. When it shuts off are you sure you have no fuel pressure? Could be spark? Have to test.
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- #8 of 100
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Re: 1992 blazer fuel problem [repairdog]
by morgan420
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Sep 27, 2006 (1:30 pm)
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Replying to: repairdog (Sep 27, 2006 11:40 am)
well i pulled a spark plug and it was getting spark. And when it dies I sprayed a little starting fluid and it ran just a little off that you know fired off the stuff. I did that b/c i dont have a fuel pressure gauge. Yea and where is the fuel pump relay switch I cant find it for nothing. thanks
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- #9 of 100
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Re: 1992 blazer fuel problem [morgan420]
by repairdog
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Sep 28, 2006 (4:21 am)
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Replying to: morgan420 (Sep 27, 2006 1:30 pm)
92 should be under hood drivers firewall and if CPI injection and no throttle body inj (TBI) you need 60psi to start and 53 to run so you have to test the pressure sometime toi rule it out.
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- #10 of 100
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Re: 1992 blazer fuel problem [repairdog]
by morgan420
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Oct 01, 2006 (7:52 am)
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Replying to: repairdog (Sep 28, 2006 4:21 am)
Wow is it one of those two relays right on the firewall driver side? I'll check them, but I have a chilton manuel and it says its behind the dash man i tore half my dash out trying to find it. But ill check thoses two and the pressure. Thanks hope i figuer it out. I mite be back. lol
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