2002 2500 Chevy Express- hard to start idles fine step on throttle and boggs down, no acceleration have to baby it up to speed. I have changed cap,plugs,wires,coil, drop tank checked fuel pump, filled it up and gas flowed out the top.Didn't see a overflow return hose, isn't there supposed to be 1 visible or is it inside the fuel fill hose?

Harvey N Tawatao

• 3854 Answers
• Posted on Jun 11, 2009

SOURCE: 95 Chevy C-1500 runs rough at idle and during accelleration

Check the vacuum line to the fuel pressure regulator and check to see if the fuel pressure regulator has gone bad. Give the throttle body a good cleaning and the injectors too. Do not use carb cleaner, it's to corrosive for the gaskets used in the throttle body. The other thing too that would cause this is a stuck or bad EGR valve, Try cleaning the EGR valve too since your cleaning the throttle body. Good luck and keep me posted.

SOURCE: 1997 chevy silverado 1500 350 vortech, new fule pump not working

before you drop tank again, check fuses & relay.then disconnect fuel line @ filter turn key to on position should hear fuel pump run and get gas stream out of line. if no flow from line new pump faulty be sure & remove negative battery cable first good luck.

SOURCE: 1987 chevy S10 engine idle problem

relace the throtle air idle valve.The temp switch will allso cause this problem.

John DeCosta

• 155 Answers
• Posted on Aug 03, 2009

SOURCE: fuel pump wiring diagram for 1998 chevy express

Well if theres power going to the relay but not out, then you need a new relay. If theres power in and out of the relay, you might need a new fuel pump. The electric fuel pumps inside the tank are actually lubricated by the fuel as it pumps it, and if it runs dry long enough, it can burn out the pump

SOURCE: 93 s10 blazer, 4.3 engine code w...cranks and runs

I don' know if this could be your problem or not, but i had a simmiler problem on a 95 blazer i had,first i thought it was the egr valve, so i took it off cleaned it real good both valve and intake, put it back on it helped but it was still there, my friend a cert. michanic said it was in the injection system just a little skip in the engine when you were just crusing down the road at a steady speed like a gust of wind would hit you, at that time my friend witch is a certified michanic at a chevy dealer advised me to trade it off so i did, at that time it would cost me around 800 to 1000 bucks to fix, but i'am sure its a lot cheaper now, as this was 7 or 8 years ago. Thies injection systems were put on the 4.3 vortex engines, if yours is not a vortex i would say its still a problem with the throutle body.

Testimonial: "very possible. the spider is about $300 aftermarket,and i have been contemplating replacing it."