Question about 1991 Isuzu Rodeo

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1991 rodeo, new fuel pump, fuel filter, fuel line has good pressure its still using way to much fuel. no visible leakage. where is the fuel going?

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I had the same issues, after replacing the ECU temp sender under intake manifold, the Airflow meter-even though it tested fine, having the injectors cleaned by one mechanic , having the codes read by another mechanic and testing ok and discovering they had no O2 sensor to replace. I pulled the feul pressure regulator off and found some f-wit had blocked the rail side opening with a bolt Put a new one in $120 and she runs sweet. 1991 rodeo, new fuel pump, - 1991-rodeo-new-fuel-pump-ss5glgvaflbxcpx1hle22tor-1-0.jpg

Posted on Nov 26, 2014

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Have a look at the fuel pressure regulator FPR. It is the circular fixture on the end of the fuel rail. It has attached to its top a vacuum line connected back to the inlet plenum. If the diaphragm in the FPR has become broken ten a) the fuel pressure will be higher than needed at idle and low throttle conditions and b) fuel may be sucked along the vacuum line into the inlet plenum further enriching the mix. Both of these situations will add to increased fuel consumption. The FPR has within it a spring loaded valve. When the pressure in the fuel line exceeds a certain level the valve is pushed back against the spring pressure and fuel bleeds past to the return fuel pipe back to the tank. The diaphragm acts against the spring pressure. At idle the throttle plate is closed and the vacuum within the inlet plenum is strong. The amount of pressure required to open the valve under idle conditions is considerably less. The ECU can regulate the injection cycle times. If the fuel pressure is high the amount of fuel is correspondingly greater. At idle the low pressure ensures lower fuel consumption. To check: If the FPR is working OK the following will happen in response to the following. With the engine at idle disconnect the vacuum line to the FPR and put your finger end over the exposed pipe to the inlet plenum to preserve vacuum. The engine speed should immediately pick up for about two seconds as the increased pressure in the fuel line results inn an enriched mix and then the engine should sound rougher than usual as it tries to cope with the higher fuel air mix available. Replacing the vacuum line should cause the engine to dip in revs as the fuel line pressure drops, before resuming its usual normal idle. If the FPR is faulty you may first of all smell and maybe see fuel from the disconnected vacuum line. There will be no increase in revs as the engine will already be running on the rich fuel mix due to high pressure in the fuel line. To fix simply replace it

Posted on Aug 25, 2010

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Do you have check engine light on?have you had it tuned up? the plugs and wires may need replaced.check the mass air flow sensor also and replace the air filter. suggest you also add lucas fuel treatment to your gas to clean those injectors. sounds like you just need a good tune up. i hope this helps!!

Posted on Aug 25, 2010

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How do you know how much fuel is being used....just need to be careful as it is a heavy vehicle, and if you are towing, or using heavy loads, this could be an indicator.....have you had it serviced..ie spark plugs changed, engine trouble codes checked, engine oil replaced, coolant in good condition........this is a difficult question to solve without having all these details

Posted on Aug 25, 2010

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2 Answers

94 Camry 2.2 starts runs good after ten minns no power at allpress Cass petel it sounds like it's starving. For gas


mmm... sounds like fuel pump is overheating, this could be because filter is dirty or pump is going bad. change the fuel filter, if that does not fix it you would only have wasted $15

Dec 22, 2014 | Cars & Trucks

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How can you tell your fuel pump is going bad in a 2003 Isuzu rodeo


Place a pressure gauge in the fuel line check the reading while slowly crimping the return line if the pressure starts to rise the pumps ok. a partly blocked filter can over load a pump and cause it to fail or shorten its life.

Sep 21, 2014 | 2003 Isuzu Rodeo

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2001 Rodeo 2.8 Turbo Diesel running perfectly one day won't run the next. Seems to be after it sits for a couple of days. Any suggestions?


Hi Peter, If the vehicle turns on the starter all the time, and sometimes starts and other times fails, check the fuel filter for leakage. Sometimes air gets into the fuel system. When it gives problems, open the bonnet (hood) and have someone pump the pump on top of the filter housing. If it feels soft when beginning to pump, I would suspect either a leakage on the fuel line or the filter housing. If you need to replace the housing and filter, remember to fill the replacement filter with clean diesel fuel first. the glow plugs can also cause problems if one or more have burned out. Regards John

Oct 31, 2012 | Cars & Trucks

1 Answer

Where does the fuel line at the end of the injector rail run to on a 1991 rodeo


All fuel injected systems have a feed line to the engine's fuel rail to keep constant pressure at the injectors fuel entry point. A tiny bit goes into the engine cylinders when the computer allows the injector to open by a signal pulse.
And the rest of the fuel in the rail is pushed by the pump back to the gas tank by a Fuel Return Line (what you are seeing and the other line in all fuel injected systems.
Think about it. The pump is running constantly (with the engine), so to avoid pressure build-up, or having to continually turn the pump on and off, voila, put in a return line after a pressure regulator gets the pressure right in the rail, and let the excess go back to the tank. Pretty good idea: no stale gas left there on top of engine. I hope this helps you understand it better.

Nov 28, 2011 | Cars & Trucks

1 Answer

How to change a fuel pump on a 1992 Toyota carolla


Electric Fuel Pump-Fuel Injected REMOVAL & INSTALLATION The electric fuel pump is contained within the fuel tank. On 1988-92 models, it is necessary to remove the fuel tank from the vehicle in order to reach the pump. On 1993-97 models, the fuel pump can be accessed by removing the rear seat cushion and service hole cover. 1988-92 Models Fig. 1: Exploded view of the electric fuel pump 88275g77.gif
NOTE: Before disconnecting fuel system lines, clean the fittings with a spray-type engine cleaner. Follow the instructions on the cleaner. Do not soak fuel system parts in liquid cleaning solvent. CAUTION
The fuel injection system is under pressure. Release pressure slowly and contain spillage. Observe "no smoking/no open flame'' precautions. Have a Class B-C (dry powder) fire extinguisher within arm's reach at all times.
  1. Disconnect the negative battery cable and relieve the fuel pressure. Remove the filler cap.
  2. Remove the fuel tank from the vehicle.
  3. Remove the fuel pump bracket attaching screws, then remove the fuel pump/bracket assembly from the tank. Fig. 2: Remove the bolts retaining the pump bracket to the fuel tank 88275g78.gif

  4. Pull the lower side of the fuel pump from the bracket.
  5. Remove the nuts attaching the wires to the fuel pump.
  6. Disconnect the hose from the pump.
  7. Separate the filter from the pump. Use a small screwdriver to remove the attaching clip. Fig. 3: Pull off the lower portion of the pump from the bracket 88275g79.gif
    Fig. 4: If necessary, remove the clip and pull out the filter to replace it 88275g80.gif

  8. While the tank is out and disassembled, inspect it for any signs of rust, leakage or metal damage. If any problem is found, replace the tank.
  9. Inspect all of the lines, hoses and fittings for any sign of corrosion, wear or damage to the surfaces. Check the pump outlet hose and the filter for restrictions.
  10. When reassembling, ALWAYS replace the sealing gaskets with new ones. Also replace any rubber parts showing any sign of deterioration. To install:
  11. Install the pump filter using a new clip. Install the rubber cushion under the filter.
  12. Connect the outlet hose to the pump, then attach the pump to the bracket.
  13. Connect the wires to the fuel pump with the nuts.
  14. Install the fuel pump and bracket assembly onto the tank. Use new gaskets.
  15. Install the fuel tank.
  16. Start the engine and check carefully for any sign of leakage around the tank and lines. Road test the vehicle for proper operation.
1993-97 Models CAUTION
The fuel injection system is under pressure. Release pressure slowly and contain spillage. Observe no smoking/no open flame precautions. Have a Class B-C (dry powder) fire extinguisher within arm's reach at all times. Fig. 5: Exploded view of the fuel pump components 88275g81.gif
  1. Disconnect the negative battery cable. CAUTION
    On models with an airbag, wait at least 90 seconds from the time that the ignition switch is turned to the LOCK position and the battery is disconnected before performing any further work. Refer to Section 7 for all air bag warnings.
  2. Relieve the fuel pressure.
  3. Remove the rear seat cushion.
  4. Remove the floor service hole cover. Fig. 6: Remove the 4 service hole cover retaining screws 88275g82.gif

  5. Disconnect the electrical fuel pump wiring at the fuel pump assembly. Check for any fuel leakage while in there.
  6. Remove the gas cap, this will prevent any fuel gas spilling out of any high pressure lines.
  7. Using SST 09631-22020 or an equivalent line (flare nut) wrench, disconnect the outlet pipe from the pump bracket. Fig. 7: Disconnect the outlet pipe from the pump bracket 88275g83.gif

  8. Remove the pump bracket attaching screws.
  9. Disconnect the return hoses from the pump bracket, then pull out the pump/bracket assembly.
  10. Remove the nut and spring washer, then disconnect the wires from the pump bracket.
  11. Remove the sending unit attaching screws, then remove the unit from the bracket. Fig. 8: Pull the pump bracket with pump attached from the tank 88275g84.gif

  12. Pull the lower side of the fuel pump from the bracket.
  13. Unplug the connector to the fuel pump.
  14. Disconnect the hose from the pump.
  15. Separate the filter from the pump. Use a small screwdriver to remove the attaching clip.
  16. Inspect all of the lines, hoses and fittings for any sign of corrosion, wear or damage to the surfaces. Check the pump outlet hose and the filter for restrictions.
  17. When reassembling, ALWAYS replace the sealing gaskets with new ones. Also replace any rubber parts showing any sign of deterioration. To install:
  18. Install the pump filter using a new clip. Install the rubber cushion under the filter.
  19. Connect the outlet hose to the pump, then attach the pump to the bracket and tighten to 22-25 ft. lbs. (29-34 Nm).
  20. Engage the connector to the fuel pump.
  21. Install the fuel sending unit to the pump bracket.
  22. Install the fuel pump and bracket assembly onto the tank. Use new gaskets. Tighten the pump bracket retaining screws to 34 inch lbs. (4 Nm).
  23. Connect the return hoses to the pump bracket.
  24. Install the service hole cover, then the engage the fuel pump and sending unit connector.
  25. Install the rear seat cushion.
  26. Start the engine and check carefully for any sign of leakage around the tank and lines. Road test the vehicle for proper operation.
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Jan 24, 2011 | 1992 Toyota Corolla

1 Answer

Fuel filter replacement for 2001 isuzu rodeo


Under vehicle, passenger side, below seating area, front of fuel tank, mounted on frame in fuel line

Fuel filters and elements are serviced by replacement only. Some vehicle manufacturers recommend fuel filter replacement at 30,000 miles (48,000 km). Always replace the fuel filter at the vehicle manufacturer's recommended mileage.
The fuel filter replacement procedure varies depending on the make and year of the vehicle and the type of fuel system. Always follow the filter replacement procedure in the appropriate service manual. The photo sequence below shows a typical procedure for relieving fuel pressure and removing a fuel filter.
Removing a Fuel Filter on an EFI Vehicle
fps23-01.jpg Disconnect the negative cable at the battery.
fps23-02.jpg Loosen the fuel tank filler cap to relieve any fuel tank vapor pressure.
fps23-03.jpg Wrap a shop towel around the Schrader valve on the fuel rail and remove the dust cap from the valve.
fps23-04.jpg Connect the fuel pressure gauge to the Schrader valve.
fps23-05.jpg Install the free end of the gauge bleed hose into an approved gasoline container, and open the gauge bleed valve to relieve the fuel pressure.
fps23-06.jpg Place the vehicle on the hoist and position the lift arms according to manufacturer's recommendations. Then raise the vehicle.
fps23-07.jpg Flush the fuel filter line connectors with water, and use compressed air to blow debris off and away from the connectors.
fps23-08.jpg Follow the recommended procedures for disconnecting the fuel inlet connector.
fps23-09.jpg Art courtesy of Delmar - Thomson Learning. Follow the recommended procedures for disconnecting the fuel outlet connector, then remove the fuel filter.
Installing Fuel Filters
In-line fuel filters are installed in the fuel line. In carbureted engines, the in-line gasoline filter is usually installed between the fuel pump and the carburetor. In vehicles with a fuel injection system, the location of the fuel filter is determined by the manufacturer. An arrow on the filter shows the direction of fuel flow.
  • To install a new filter, begin by wiping the male tube ends of the new filter with a clean shop towel.
  • Apply a few drops of clean engine oil to the male tube ends on the filter.
  • Check the quick connectors to be sure the large collar on each connector has rotated back to the original position. The springs must be visible on the inside diameter of each quick connector.
  • Then install the filter in the proper direction and leave the mounting bolt slightly loose.
  • Install the outlet connector onto the filter outlet tube and press the connector firmly in place until the spring snaps into position.
  • Grasp the fuel line and try to pull this line from the filter to be sure the quick connector is locked in place.
  • Then, do the same with the inlet connector.
  • Now tighten the filter retaining bolt to the specified torque.
  • Once everything is connected, lower the vehicle, start the engine, and check for fuel leaks at the filter.

May 15, 2010 | 2001 Isuzu Rodeo

1 Answer

I just purchased a 1991 Isuzu Rodeo and the fuel pump is not priming it. The SUV runs it just doesn't want to start.


start by checking the fuel pressure and do it while starting. see how long it takes for the fuel pressure to build and once it has built up, wait and watch it bleed down. it should hold. if not, replace the pump and filter. a fuel pressure guage is going to be your best friend in this case. it would be a good idea at this point to also replace the plugs. happy new year

Dec 31, 2009 | 1991 Isuzu Rodeo

2 Answers

Adjusting fuel pump


If you have the 91 3.1 V6 Rodeo you can't adjust the fuel pump or fuel pressure. The only thing you can really do is to get a throttle body rebuild kit that will have a new diaphragm for the fuel pressure regulator. If you want to adjust it, you'll have to get an aftermarket regulator and install on the return line (the smaller line) and remove the spring out of the regulator on the throttle body. If you feel the fuel pressure is too low, then you might need to change the pump. Its located in the fuel tank, only takes 1 or 2 hours to do.

Jul 12, 2009 | 1991 Isuzu Rodeo

2 Answers

Wont start 1999 isuzu rodeo


Locate the Fuel Filter and Take it loose. Try to Start the Truck, If the Pump is Good, Fuel will come out of the Fuel line going to the Filter. Please Rate My Response! Thanks!

Feb 07, 2009 | 1998 Isuzu Rodeo

1 Answer

Where is the fuel filter in my 1992 Isuzu Rodeo?


Look on passenger side frame rail ahead of the rear wheel in a bracket with a fuel line on each end. Before starting replacement-- be sure to release pressure from fuel lines, by removing fuel pump fuse under hood and running engine to use gas from lines. I then remove fuel lines by moving clamps away from fitting so hose can be pulled loose from old filter while it is still in bracket. On top of mounting is a bolt that holds filter clamp in place . After removing clamp and filter from mounting bracket, loosen filter body clamp and slip oout old filter-- then in with the new filter. Then reverse your steps to install filter. After filter is back in place -- reinstall fuel pump fuse, turn on key for a few seconds for gas to refill lines, then start engine and check your installation to make sure you have no fuel leaks at line connections.

Oct 18, 2008 | 1992 Isuzu Rodeo

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