Fuel pressure regulator

My 94 explorer has intermittent starting problems. After listening to
your advice, here is where I am now:
When it doesn't start..I listen for the fuel pump when the key is on,
it runs but doesn't stop after a few seconds like when it does start. I
can also hear a sound under the hood like air leaking. I assume this is
from the pressure regulator. The fuel pump was replaced last year with
an Advance auto pump for an unrelated reason(rusted, leaking fuel
line). Could a pressure regulator fail in such a way to prevent it from
starting? Thanks for all the help so far, much better than the garage.

Rich wrote:
Could a pressure regulator fail in such a way to prevent it from
> starting? Thanks for all the help so far, much better than the garage.
>

It definitely can and has happened repeatably on the first gen models.
What usually happens is the vacuum bladder in the FPR goes bad and
allows gas to be directly taken into the intake manifold via the vacuum
line. the easiest test is to simply pull the vacuum line and smell /
look for fuel.

Steve