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CarGurusJul 28, 2012 - Fuel System Loses Pressure - I have a 2003 Chevy S-10 Pick Up with the 4 ... car a few times, what essentially you are doing is priming the fuel pressure. ... A dirty fuel filter will not cause the lines to lose pressure after the engine is shut off. ... I have a 98 s10 2.2 liter and it was driving fine all day then when ...
CarGurusSep 16, 2012 - My 2001 S10 has a hard starting problem if the truck sits between 1 ... Vacuum leak, have you checked fuel pressure while it sits? ... Would the spider alsocause a misfire at low rpms? .... at an idle, or squeaking while driving and it gets faster as you go? ..... 1994 Chevrolet S-10 2 Dr STD Standard Cab LB.
Chevrolet S-10 pickup won't run and has no fire unless I jumper the fuel pump relay. ... Once the truck starts and is running you can remove the jumper to the fuel pump ... Iwould get the fuel pressure checked to start with, because that's where the ... 93 gmc 4.3l FI runs but dies out loss of power after 5 mins of running then ...
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Good question. Many things to eliminate. You might want to have a mechanic narrow this down with a diagnosis. Otherwise, here are possible causes:
Fuel pressure regulator: If the fuel pressure regulator is faulty, it can cause the engine to start and then stall immediately. You may want to check the fuel pressure regulator to see if it's working properly.
Fuel pump relay: A faulty fuel pump relay can cause the engine to start and then stall immediately. You may want to check the fuel pump relay to see if it's working properly.
Crankshaft position sensor: If the crankshaft position sensor is faulty, it can cause the engine to start and then stall immediately. You may want to check the crankshaft position sensor to see if it's working properly.
Ignition switch: A faulty ignition switch can cause the engine to start and then stall immediately. You may want to check the ignition switch to see if it's working properly.
Battery: If the battery is weak or dead, it can cause the engine to start and then stall immediately. You may want to check the battery to see if it's working properly.
Fuel filter: A clogged fuel filter can cause the engine to start and then stall immediately. You mentioned that you already changed the fuel filter, but it's possible that there's still an issue with it.
Vacuum leak: A vacuum leak can cause the engine to start and then stall immediately. You may want to check for any vacuum leaks in your truck.
Sounds like the fuel pressure regulator in your EFI (carburator). Sorenson make a rebuild kit complete with gaskets, screens and regulator for around $30.
You've already eliminated the spark plug & wireset, distributor cap & rotor. Sounds like your car needs a tune-up, specifically, the PCV (positive crankcase ventilation) valve, and/of the EGR (Exhaust Gas Recirculation) valve.
Components checked/replaced during a tune-up are: air filter motor oil motor oil filter breather filter fuel filter(s) fuel strainer PCV valve EGR valve spark plugs spark plug wires ECM or distributor cap & rotor cabin air filter transmission oil filter transmission oil engine coolant check all vacuum hoses and lines
Troubleshooting the no-start condition - from the 1990 Mitsu Mighty Max Repair Manual:
Priority Action Part Type -- Cause 1 Inspect Battery -- Battery Discharged or Faulty. 2 Inspect Battery Cable -- Corroded, Broken, Shorted or Poorly Connected Battery Cable. 3 Inspect Distributor Cap -- Distributor Cap Cracked or Burned. 3 Inspect Fuel Filter -- Clogged or Dirty Fuel Filter. 5 Inspect Ignition Coil -- Faulty Ignition Coil. 6 Inspect Wireset -- Worn, Damaged or Faulty Spark Plug Wire(s). 7 Inspect Spark Plug -- Incorrectly Gapped or Fouled Spark Plug(s). 8 Inspect Starter -- Starter Motor Faulty. 9 Inspect Fuel Pump -- Low Fuel Pressure. 10 Inspect Solenoid Switch -- Faulty Starter Solenoid Switch. 11 Inspect Fuel Pump Relay -- Faulty Fuel Pump Relay. 12 Inspect Fuel Injector Pressure Regulator -- Faulty Fuel Injector Pressure Regulator. 13 Inspect Ignition Switch -- Improperly Connected or Faulty Ignition Switch. 14 Inspect Starter Drive -- Faulty Starter Drive. 15 Inspect Fuel Injector -- Dirty or Worn Fuel Injectors. 16 Inspect Fuel Pump Strainer -- Clogged or Dirty Fuel Pump Strainerat. 17 Inspect Engine Control Computer -- Incorrect Operating Information Being Delivered and Sent From The EEC. 18 Inspect Fuel Tank -- Fuel Tank Empty. 19 Inspect Carburetor -- Carburetor Flooded or Faulty Choke. 20 Inspect Distributor -- Worn, Loose, or Incorrectly Installed Distributor.
Check to make sure oil pressure switch is not sticking or gummed up and connections are tight. Your oil pressure switch is also a safety feature that will shut down fuel pump in case you're in an accident and/or rollover.
Hi and welcome to FixYa! The fuel pump relay regulates the power given to the fuel pump. If the fuel pump relay is faulty there will be no power to the fuel pump and will result to fuel supply failure. These relays just like the others serves as regulators so that the battery will not fail during electrical loads.
Hope this helps and thank you for using FixYa! Have a good one!
The real test is to use a fuel pressure tester. It sounds like the fuel pump is making the initial prime but failing to build pressure. This could be a bad fuel pump or it possible that you have a bad fuel pump relay. I would test the fuel pressure on the fuel rail first, if you have consistant pressure generally above 25PSI, (check MFG. spec..) then I would consider checking the regulator. If you lose pressure just after the start up then try replacing or swapping the fuel relay and see if this corrects it. If not then chances are your going to have to replace the pump.
First of all, why do you think it is fuel at all, since it could be the ignition? Second is that if the car shuts down, how do you know it is not simply a clogged fuel filter? A bad pressure return regulator can blow out fuel pumps by causing the pressure to be so high the pump over works itself.
I suggest you need better data. A fuel pressure gauge would be nice. You could improvise one out of a cheap mechanical oil pressure gauge. You could also run some long thin wires to the fuel pump relay output or even to the pump itself, and hang a little LED off the dash as a temporary diagnostic indicator light. To catch an intermittent, you need constant data.
Quite a few things can cause a car to die after idling for awhile, but if you have verified that the fuel pressure is actually dropping when the motor dies, the likely culprits are: 1) Electric fuel pump in the gas tank is bad 2) The fuel pressure regulator (on the throttle body) is bad 3) An electrical problem in the power to the fuel pump (like a bad fuel pump relay or lose ground wire to the relay's circuit)
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