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Re: 91 rx7 man
Believe it or not if it has the wrong plugs or they are dirty i would check them fist pull out the primarys which are the ones on top in both housings first check if they are dirty and smell if they are covered in fuel if they are make sure you change them with the correct plug that has the four prongs at the top of the plug also check the secondary plugs for the same wear.
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It would greatly help to know make, model, and year, but in general you check fuel pump pressure with a gauge, and if the pump is electric, it always has a relay so there is the ability to have a safety cut out. Some vehicles use lack of oil pressure to cut out the pump relay, but most use the alternator output. Fuel injection usually has from 20 to 40 psi fuel pressure, and carb systems from 3 to 10 psi.
Just because it pumps gas doesn't mean it is at the exact pressure it should be? Most fuel pumps have a psi of 40 to 45 psi, your fuel pump could be pumping at 25 psi or less which is not enough to start your car even though you can see some fuel pumping out. A simple tool to check fuel pressure can be bought at any auto parts store, check the specs on the fuel pump for your 02 Chevy first to see at what pressure it works, then use the fuel pressure gauge to check it. Anything less than what the specs on your fuel pump are suppose to be and you have a bad fuel pump?
Let's say your fuel pump works at 43psi, you hook up the fuel pressure gauge and you find that it reads 25 to 30 psi, that means it's not enough fuel pressure to start your engine.
Is the check engine light on when the engine is running ? Someone will need to check for spark on all cylinders and fuel pressure. You might try spraying carb cleaner or starting fluid into the throttle body to boost fuel supply and see if it helps. If it does that would tell you its a fuel problem.
It drops when it is turned off through the return the pump might be getting weak If you keep using the starting fluid you will blow the intake off of it or it will get hooked on it and won't start without it.
If you have to spray fluid into it then it sounds like the fuel presseure is not there, get a fuel pressure gauge and see what the pressure reading is, then leave it hooked up for what ever time it takes to not start, before you try to start it check the pressure, if it has dropped then your fuel injector/s or fuel regulator is leaking, crank the engine after taking the reading, the fuel pressure should come back, 60-66 PSI, Vent the fuel tank vapors by loosening the fuel cap.Position the ignition switch and the A/C system in the off position. Install a fuel pressure gauge to the vehicles fuel pressure valve. and with the keyon, engine off verify the PSI reading on the gauge.
Anything less than 60 psi and your fuel pump is weak
Check the fuel pressure at the shredder valve. You should have 60psi to 65psi with the fuel pump primed and engine not running. Once the engine has been started, there should be a 5psi drop. Make sure the fuel filter has been replaced and that the fuel pump is making at least 60psi. Anything less or more then 65psi will not activate the fuel injectors, the other thing to is that the spider injection system on the vortec are know to go bad and you may have to replace the system. Good luck and keep me posted, be glad to help you get your S-10 running 100% again.
i would do a fuel pressure test. should be around 50 P.S.I. 3 to 4 P.S.I. lower from that could mean pump is weak and most likely ready to quit altogether. also when was the last time its had a fuel filter. if its been a while chg. it and then see how it starts.
What about the fuel filter????? Have you changed it out??? If you can spary something like a started fluid, that means it is a fuel problem. My last check, it has to be above 50-psi on the fuel pressure to make it run right. I had 35psi, but whould not get over 30mph or down hill maybe 45mph. Check both filter & pressure, but check pressure with a New fule filter!!!!