When my teg sits for a while, it is hard to start. It is a fuel related issue. The fuel rail is losing fuel (check valve?) Car cranks but wont start, unless I bump the key repeatedly when the check engine light goes off ( giving the fuel rail gas.) After the fuel pump fills the rail with gas, the car starts great. When I turn it off it starts great unless it sits for a while, then I have to cycle the main relay by turning the key on/off to fill the fuel rail again.
I have changed the fuel pressure regulator. Mechanic measured the fuel pressure and it is low. He says it needs a fuel pump.
My question is- Isn’t there a check valve that is suppose to hold the pressure in the fuel rail and, if so, Is it part of the fuel pump or is it separate from the pump?
Thanks for your input.
you can check the MFR(main fuel relay)
that normally goes out on our cars causing the car not to start and keeping the check engine light on.
do some research here, you’ll find more then enough.
-karlo
[QUOTE=iRockTheDA9;2165737]you can check the MFR(main fuel relay)
that normally goes out on our cars causing the car not to start and keeping the check engine light on.
do some research here, you’ll find more then enough.
-karlo[/QUOTE]
thanks for your reply.
I researched here (fuel pump issues) before posting and havn’t found anything about the fuel pump check valve location. I have read hundreds of posts.
The car starts. There is nothing wrong with the relay and I don’t have a check engine light on other than the normal starting sequence, and the ECU isn’t throwing a code.
Fuel is draining out of the fuel rail when it sits.
pressure doesn’t remain constant in the rail. it will drop over time. it is normal. that is why the relay primes.
usually a fuel pump will either work or it won’t. not really in between
Check your fuel filter before you go replacing your pump.
yup. more likely a clogged filter
[QUOTE=welfare;2165834]pressure doesn’t remain constant in the rail. it will drop over time. it is normal. that is why the relay primes.
usually a fuel pump will either work or it won’t. not really in between[/QUOTE]
This comes from a master mechanic…
If the car runs after it starts, then the fuel pump should be OK. Does this happen when the engine is cold/warm? You could have a problem with the fuel pressure leaking down, which may be from a bad check valve, which is located on the pump, but this will normally cause a no start when the engine is warmed up.
why not just hook up a fuel gauge to the rail? see if it’s within spec. see how fast the pressure drops. it should drop, over quite some time. not right away though
Its the fuel pump check valve, you could just prime the fuel pump once or twice and leave it. or spend the cash to fix it.