[chevota'54]

4.3 V-6, started run crappy then stalled, would'nt restart and when it did start, very rough idle then died again. Tracked it down to fuel related,changed the fuel filter, smoothed out the idle but wont accelerate. would a O2 sensor cause that or do I still have dirt in the injectors?

[prumora1]

go to shradder valve that is on the fuel rail while idleing and push down to see how much pressure is there. if very little get a fuel pressure gauge and check pressure at shradder valve. should be really close to 40lbs. if not probably has enough pressure to idle but not accelerate.

[LATECH]

I agree. A fuel pressure test is now needed to further any diagnostics.
TBI systems run 11-13 PSI
Vortecs run 60 ish and above IIRC. Check specs for your system to be sure and on the vortec system, the procedure is a little involved, be sure to test it according to the service manual.

[ratrodheritage]

I had an astro van same motor that accumulated so much carbon over time the plastic pcv line was cacked solid and the pcv valve was stuck or cacked open. Its worth a look and easy to check.

[1Gary]

High failure rate on Astro F/P's.Do the check on the F/pressure.Stay away from the off brand replacement F/P's like Airtex.They don't last long.Adding A.C. Delco to the list of brand names not to use.They did a cross part number to combine a number of pumps for other uses.Told me the pressure doesn't matter as much as the volume and they no longer sell pumps that is the OEM pressure spec for Astro's.I'm calling that B.S.Delphi still sells pumps to OEM spec's and I recommend you buy that brand for your yr van.

Rough idle often is related to carbon build up in the EGR.Get a replacement screened gasket and a dentist pick to clean the carbon chunks out.

[LATECH]

Actually, and not to start anything, as I do respect Gary1 as a fellow Tech, I personnaly have had excellent luck with the airtex pumps and pump/modules.
The OE I dont usually use so I cant say. I am speaking from personal experience, please dont take it wrong, Just sayin thats all.
I had 1 airtex fail, and it wasnt the pump...the clamp that hooks the pump to the sender housing wasnt crimped, made it 5 miles before it blew off. I guess it is our jobs as techs to chech everyone elses work.
I had to pull it out and replace it with another. I thought ...the heck with them, the manufacturer needs to see this and pay warranty time, after all its their fault.

[chevota'54]

Thanks guys, I can here the pump run for a few seconds then stops when I first turn on the key. I'll check fuel pres. first, and for carbon. It's been a well maintained engine, but does have 188+ miles. Thanks again, I'll check back later as its gonna have to be Sun. before I can mees with it again.

[Mr.NutCase]

is this the vortec engine? GM fuels fail alot...

[1Gary]

You want to check all the vac lines too.Does this have A/C??. Those have been found to leak vac.