Question about 1993 Chevrolet S-10 Blazer

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I have a 1991s10 pick up4x4 4.3 I replaced the fuel pump and sending unit/fuel filter/relay and checked all the weiring when i turn the key on no power to the pump then i hook up my tester to the computer its telling me that the relay or short circuit put new relay in when its worm out it will start when its cold out its hard to start then i poled out the spark plugs and they wear wet dryed them then i can get the truck to start it seams like its getting to much gas what do you think it is

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Its drawing moister replace the dis cap and rotor

Posted on Mar 02, 2009

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I have a1988Chevrolet truck it quit running i checked it and it's not getting fuel replaced the fuel pump and fuel filter and fuel relay it has3 wires going to pump red1 is hot .


On the pump harness, the pink wire goes to the sending unit and the gray or tan/white goes to the pump.
On the relay, the green/white grounds the relay from the engine computer, the orange is hot, the red is a jumper wire, and the gray goes to the pump. Keep in mind the relay is only "on" for 3 seconds when you turn the key on. The engine computer must see RPM or oil pressure to continue to power the pump relay.

Apr 10, 2016 | Chevrolet Cars & Trucks

1 Answer

Fuel pump troubleshooting


First check the fuses... with a volt meter.. don't just look at them.. When you turn on the key the ign switch powers up the computer... .. The computer sends a single to a relay.. the relay comes on for 1.5 seconds when you turn the key to on to charge the system.. after you crank it for a few turns the fuel pump come on to keep the engine running. Turn the key to on and listen for that 1.5 sec. pump run.. if you have to go under the car and have somebody else turn the key.. if you hear it running then the fuel pump runs.. if you do not hear it run check that the ign switch is sending power to the acessories/computer. then check the relay to see if it is operating when you turn the key to on.. listen to it and touch it.. yyou should be able to hear it and feel it click. Just because the pump is running does not mean that it is pumping...so the next step is to hook up a pressure guage to the fuel rail and see if there is any pressure. (Harbor freight tools if you do not have one) You can jump the pump with a 12v wire.. jump it at the pump connector on top of the tank. if it runs check the fuel pressure.. if there is none.. or very little the pump is bad.. or the fuel filter is clogged.. or the pick-up filter in the tank attached to the pump is clogged.

Jul 20, 2014 | 2001 GMC Jimmy

2 Answers

Electrical prblem


There would be a fuel pump fuse, either under dash or under hood. Check that fuse, use the test light to see if fuse has power. If not, then it might be a fusible link or maxi-fuse that feeds the fuse panel. If fuse has power with key on, pull the relay, and use the test light and probe relay terminals, key off. One terminal should be hot at all times. If not, check for power loss between battery and relay terminal-possibly a maxi-fuse or fuse link.
If relay does have power to terminal, quickly check other terminals while someone turns key to on-for about 2 seconds, another terminal should show power-this would be signal from computer to turn the relay on to prime the lines and fuel rail. If you have that, plug relay in and cycle key. Does relay click? If yes, relay is working and problem may be at fuel pump connector. If relay is not working, but you have power to it, and the short signal from computer is there, then check the relay's coil side ground. Computer signals the coil side and the signal goes to ground from relay coil side.
Pull the relay and use a jumper wire from relay's hot terminal to fuel pump terminal-the wire to pump from the relay. If pump comes on, the problem is right there at the relay-either no signal from computer or the relay coil's ground is lost. If pump does not come on, again check connector at pump-that or the wire to pump[ has a problem.

May 12, 2013 | 2001 GMC Savana

1 Answer

1991 f-159 4.9l cranks but won't start fuel pumps in both tanks loud


fuel pump should only run for about 15 seconds when u first turn the key on now you should check to see if the fuel filter is clogged or your sending unit might be bad on the fuel pump itself

Jun 02, 2012 | 1991 Ford F150

5 Answers

2002 GMC Sonoma 2.2l 4cyl. I have been having intermittent fuel pump problems. I replaced the fuel pump and now the truck will not start. There is spark and there is flow at the filter, but it is very...


With the ignition key turned on without trying to start the engine you should hear the fuel pump run for a few seconds. That is how its primed to start. Upon starting the oil pressure reaches normal operations & the prime switch will cut off by the signal from the computer. Thus the engine still needs fuel to run so the computer switches on the fuel pump relay to provide the fuel to the engine. The prime switch is intergrated with the oil pressure switch. If you do not hear the fuel pump upon having the key on replace the oil pressure sensor

Dec 28, 2010 | GMC Sonoma Cars & Trucks

2 Answers

I am getting no diesel into my fuel filter is their a electric pump in my tank or is the fuel pump part of the injector pump


Fuel Pump REMOVAL & INSTALLATION Navajo and B Series Pick-up Models NOTE: To gain access to the fuel pump, it is necessary to remove the fuel tank.
  1. Depressurize the fuel system and remove the fuel tank from the vehicle.
  2. Remove any dirt that has accumulated around the fuel pump attaching flange, to prevent it from entering the tank during service.
  3. Turn the fuel pump locking ring counterclockwise using a locking ring removal tool and remove the locking ring.
  4. Remove the fuel pump and bracket assembly.
  5. Remove the seal gasket and discard it. To install:
  6. Put a light coating of heavy grease on a new seal ring to hold it in place during assembly. Install it in fuel tank ring groove. Fig. 1: Fuel pump and sending unit used on the B Series Pick-up regular cab 89685g02.gif
    Fig. 2: Fuel pump and sending unit used on the B Series Cab Plus Pick-up 89685g03.gif
    Fig. 3: Fuel pump and sending unit used on the Navajo 89685g04.gif

  7. Insert the fuel pump assembly into the fuel tank, then secure it in place with the locking ring. Tighten the ring until secure.
  8. Install the tank in the vehicle.
  9. Install a minimum of 10 gallons of fuel and check for leaks.
  10. Install a pressure gauge on the throttle body valve and turn the ignition ON for 3 seconds. Turn the key OFF, then repeat the key cycle five to ten times until the pressure gauge shows at least 30 psi. Reinspect for leaks at the fittings.
  11. Remove the pressure gauge. Start the engine and check for fuel leaks.
MPV Models
  1. Relieve the fuel system pressure and disconnect the negative battery cable.
  2. Remove the rear seat and lift up the rear floormat. Remove the fuel pump cover.
  3. Disconnect the sending unit/fuel pump assembly electrical connector and the fuel lines.
  4. Remove any dirt that has accumulated around the sending unit/fuel pump assembly so it will not enter the fuel tank during removal and installation.
  5. Remove the attaching screws and remove the sending unit/fuel pump assembly.
  6. If necessary, disconnect the electrical connectors and the fuel hose and remove the pump from the sending unit assembly.
  7. Installation is the reverse of the removal procedure. Be sure to install a new seal rubber gasket. Fig. 4: Remove the rear seat and floormat to service the fuel pump 90975g06.gif
    Fig. 5: Removing the fuel pump assembly 90975g07.gif
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Aug 17, 2010 | 1995 Mazda MPV

1 Answer

My 2003 kia sedona is shaking and shuts down fuel guage broken


SOUND LIKE FUEL PUMP GOING BAD.YOUR FUEL LEVEL SENDING UNIT IS ALSO GOING BAD ITS PART OF THE FUEL PUMP ASSEMBLY.FIRST HAVE CAR SCANNED TO SEE WHAT TROUBLE CODES IS.REPLACE FUEL FILTER AND FUEL PUMP RELAY FIRST THEY ARE CHEAPER ROUTE THEY COULD BE THE PROBLEM.BUT FUEL PUMP COST BETWEEN $300.00 TO $700.00 THAT WHY CHECK FILTER AND RELAY AND HAVE IT SCAN BEFORE BUYING ANY HIGH PRICE PARTS.IF FUEL PUMP GOOD I BELIEVE YOU CAN BUY FUEL SENDING UNIT SEPERATE DONT HAVE TO BUY WHOLE PUMP ASSEMBLY BUT CHECK AROUND SOME AUTO PARTS PLACES WILL MAKE YOU BUY THE WHOLE FUEL PUMP ASSEMBLY JUST TO FIX THE FUEL LEVEL SENDING UNIT.

May 20, 2010 | 2003 Kia Sedona

3 Answers

99 yukon 180,000 mi. doesn't start. cranks forever, but won't start. Should I be able to hear the fuel pump when I turn on the key?


yes you should be able to hear the fuel pump run for about 5 seconds once the key is turned to the on pos. check to make sure you have spark. if you do try having someone spray air intake or carb cleaner into intake manifold while you crank. If the truck starts right up for a second (or stays running as you keep spraying) Id say you have a bad fuel pump and id change the sending unit also. (First check the fuel pump fuse and fuel pump relay) GMC and Chevy are nororiously known for having bad fuel pump/sending unit problems. I have prob changed over 60 myself.

Nov 30, 2009 | 1999 GMC Yukon

1 Answer

Where is the fuel pump relay on a 1988 dodge dakota w/ a 3.9 , can I check the hot wire to the fuel pump to see if the relay works before I go to buying parts? Not a refund on electrical parts, and the...


The relay for the fuel pump is under the hood but most likely the fuel pump itself. One way to check is use a test light at the tank it should have three wires one is sending unit one is ground and third is hot turn the key and check for power or if you like you can check by putting a screwdriver to the tank and the other end to your ear turn the key on and listen for humming.

Hope this fuels your fire!

Oct 23, 2009 | 1988 Dodge Dakota

1 Answer

'99 chevy caviler fires right up, but then dies after started, like out of gas. Fuel relay sensor? fuel filter? fuel pump?


If it is fuel injected it will get enough fuel to start but not stay running. I had the same problem with my S10. Turns out the hose that went on to the end of the fuel pump was roted. pull the sending unit and check the hose connections to the pump and the sending unit. If problem presists replace filter first the pump.

Jan 25, 2009 | 1999 Chevrolet Cavalier

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