Not starting

WIRENUT222

MEMBER
1993 GMC VANDURA
5.7L
V8
2WD
AUTOMATIC
80,000 MILES

Have fuel pressure and pump works, injector spray fuel but not enough to start. I can spray starter fluid in throttle body and engine runs very smooth. But it will not start with the little amount of fuel spraying out injectors.

Monday, May 23rd, 2022 AT 3:20 PM

3 Replies

SQM

MECHANIC
6,383 POSTS

Hello,

It is possible to have a clogged fuel filter or a faulty fuel pressure regulator, which will impact the amount of fuel and fuel pressure to the engine. Another possibility is to have a weak fuel pump, or you could have debris on the fuel pump strainer.
Since you are able to make the engine run with starting fluid, the issue has to be fuel supply.
Check the fuel pressure, it should be 9-13 PSI with the key on and engine off.
Most auto parts stores have fuel pressure test gauges that you can use.

Here is a helpful guide:

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

Let me know of any questions.

Thank you.

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Monday, May 23rd, 2022 AT 8:56 PM

WIRENUT222

MEMBER
3 POSTS

I installed a new adjustable pressure regulator with a gauge on the supply line, I am getting good pressure. I have been wondering if the throttle position sensor or God forbid the ECM is faulty.

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Tuesday, May 24th, 2022 AT 3:51 AM

SQM