Will not stay running

TODD MOORE

MEMBER
1995 CHEVROLET S-10
4.3L
V6
4WD
AUTOMATIC
200,000 MILES

Had issue where under load it would spit and sputter. Replaced fuel pump, fuel filter, rotor cap and button, and pressure regulator. After replacing all this it ran fine for 3 or 4 minutes then started down road it shut off. Now it starts idles rough for a few seconds then shuts off. The spider injector is fine was replaced last summer. No fuel leaks, plenty of fuel pressure and is getting to the cylinders. Anyone have another idea or similar issue that they fixed? Thank y'all in advanced.

5 Replies

KASEKENNY

MECHANIC
18,907 POSTS

Sounds like you have a vacuum leak somewhere. I would suggest we start with checking for a leak with the guide below.

https://www.2carpros.com/articles/how-to-use-an-engine-vacuum-gauge

If everything with a vacuum leak checks out we may need to check for an internal vacuum issue by hooking up a gauge.

Below is a chart that helps determining possible issues.

Here is a guide that helps with this issue in more general terms:

https://www.2carpros.com/articles/stall-at-idle

Please run through this material and let us know what happens. Thanks

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Monday, May 31st, 2021 AT 6:20 PM

TODD MOORE

MEMBER
3 POSTS

All vacuum lines have been checked with pressure gauge and referred to manuel for readings all are normal.

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Tuesday, June 1st, 2021 AT 9:10 AM

KASEKENNY

MECHANIC
18,907 POSTS

If there are no vacuum leaks then we need to confirm what the fuel pressure is. When you say it has plenty of pressure, do you know what this is?

https://www.2carpros.com/articles/how-to-check-fuel-system-pressure-and-regulator

Let us know what the PSI is and we can go from there. Thanks

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Wednesday, June 2nd, 2021 AT 6:47 PM

TODD MOORE

MEMBER
3 POSTS

80 PSI.

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Friday, June 4th, 2021 AT 4:50 AM

KASEKENNY

MECHANIC
18,907 POSTS

That is way too high and is most likely your issue. High fuel pressure will cause the engine to run poor or not even run.

Take a look at all the attachments below. This will help run through how to figure this out.

However, it is most likely an issue with the return line. Please take note of the last page where it says not to run the engine with more then 75 PSI or you will damage the regulator.

Please let us know what you find with this. Thanks

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