It's hard to start after sitting for awhile like 2-3 hours, and has no pressure in the tank. To try and solve the problem i have replaced the injectors, put fuel system cleaner through it and changed the coolant sensor. Also it misses on idle and when i try to take off in 1st it will splutter and then go good except when i floor it. (also does it in 2nd). the next thing i will be checking will be the fuel filter.
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Remove the gas cap, to let some air into the gas tank.
As the gasoline has been consumed, what's left behind
is a partial vacuum, making it difficult for the fuel-injection pump
to pull gasoline from the tank. Remove the gas cap,
to equalize the air pressure. Works for me (and my 2002 Taurus).
The most likeyl cause is a faulty fuel pressure regulator, when the regulator diaphragm fails the vehicle is initially hard to start after sitting awhile, no fuel pressure bleeds down and needs to built back up before starting. An easy test is to removed the vacuum has at the regulator, if fuel is present, the regulator is defective.
You need to check fuel pressure carefully. This happens when tank is so full of dirt that the pump screen gets clogged. After sitting down several minutes, some of the dirt settles and the car can be restarted, but happens again. Refrain from starting to change every sensor without knowing what is the real cause, because you could be thowing money and not fixing it. Aldo check pressure regulator is functioning correctly. Amclaussen.
Low fuel pressure. You need to check the fuel pressure on the first crank and watch it as it is running. Requires a special gauge. If it were just a starting problem I would say it could be a pump relay, but not if it runs rough for 5 min. Might be a dirty filter or problem in the tank.
Thsi si the most common problem with the 4.3 L s10 & jimmy's. I have posted this solution many times, Here it is again. The problem is your fuel pump. Here is how to varify, If you want to diagnose and repair yourself you will need to purchase a fuel pressure gauge at any part store they are approximately $50. Park the vehicle in a location it can sit for a couple of hours or overnight is best. In stall the fuel pressure gauge on the fuel line behind the throttle body it has a pressure releif valve their. Unscrew the cap and place the fuel pressure on this port and make sure it is fairly tight. Turn the key to the run position but do not start the vehicle, do this around 2 to 3 times then shut the vehicle off, the fuel pressure should be well over 59lbs. and let it sit a couple of hours or over night. Do not do any thing else just check the pressure gauge and it will probably have dropped in the time it has sat untouched. If the pressure has dropped then the problem is your fuel pump and it will have to be replaced. The reason for this is not that your fuel pump is not working it is that their is a one way check valve mounted in the top of the fuel line on the outlet side and this check valve gets stuck and or wears out and allows the fuel to drain back into the tank. Therefore the engine looses its prime and by cranking over several minutes it then primes it self again, but eventually it will not start at all if not replaced. The check valve can not be replaced you have to replace the whole pump approx. $200.00 for the part. Very easy job to do. Try and do it when the fuel tank is almost empty. Start by disconnecting the battery, Then you need to raise the rear of the vehicle enough to remove the fuel tank. Remove the Hose clamps on the filler neck and the vent pipe at the fuel tank, support the fuel tank with a piece of wood on a jack and remove the 2 fuel tank strap bolts they are usually rusty so spray them and try and get them out gently so they don't break. Lower the tank carefully enough to get to the fuel lines that are attached to the pump and remove the retaining clip gently with a screwdriver. Remove the lines be careful these lines are made of hard plastic and break easily. Then lower the tank and remove from under the vehicle, Clean around the fuel pump retainer ring very well with air or rags or something you do not want rust or mud or crud inside the fuel tank, remove the retaining ring and lift the fuel pump out of the tank slowly to give it time to drain. Install a new pump and a new retaining ring and reverse steps to install. When you purchased the new fuel pump they usually come with a new wire connector because of problems they have with them melting. Please replace this harness even if it is not melted and remember to use shrink tube to prevent the **** connectors from corroding. Be sure to install anew fuel filter at the same time as well it is located on the drivers side just below drivers door on the inside of the frame. Your truck will be as good as new.
The problem is the fuel pump. The fuel pump assembly located in the fuel tank has a one way check valve in it. This check valve either jams or wheres out and then the fuel drains back into the tank after sitting for a period of time and makes the truck almost impossible to start. If the truck runs fine once it is started then this is your problem. To verify the problem purchase a fuel pressure gauge kit and connect it to the fuel rail, turn the key to the on position but do not start it the pressure shopul read around 56 PSI or more. Turn the ignition off and let the truck sit for approx 2 to 3 hours and recheck the pressure gauge if it has dropped then the check valve is no good and you have to replace your fuel pump.
for this problem only 3 cause would be there. 1 check your battery -ve (body earthing) is it properly tighten and end of wire is soldered . if ok 2 take one trail for 3 to 4 hr. with another service battery, if you found the problem is solved then replace battery. if not then last possibility is 3 check starter motor may problem with armature and carbon bursh, replace that.
First I would say less than a $1000 would have repaired your original issues,assuming there were several. How was it running and did the current problem start after all the work was done? Also, what you invested in money and parts ,I hope went to fix different issues.