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You should have about 40-50 psi on fuel rail. Is there a clogged fuel filter in the line? In line filter installed properly?
Is the fuel pump any good?
Fuel must be delivered in sufficient quantity at a sufficient pressure and this can only be checked with a fuel pressure test and a volume delivery test.
Could be a "fuel pump relay" or ford equivalent that converts ECU fuel output demand signal to power to the fuel pump. To test jump direct positive to fuel pump and see if you get pressure at the rail. If you get pressure, that may be part of the problem. If not enough pressure (but measure) you may have a fuel pressure regulator or ford equivalent issue.
If gas is getting to the fuel rail, it is getting to injectors. If fuel pressure is good, probably the injector circuit is not working. With a test light you can check the injector circuit. Post back for further help. What year and make is the car?
Theres 2 pumps
one in the tank, lift pump, and one in the chassis rail under the driver side.
The one in the tank is cheap, the one in the rail is not.
The one in the tank only produces low pressure to prime the main pump and if it is broken, may not cause that much of an issue except when starting. the one in the rail is a no-start if it fails.
The idea is that the rail pump can supply high pressure for the injectors, so a fuel pressure test at the injector rail will determine which pump is playing up.
Hope that helps
Tim
Sounds like the fuel pressure regulator. Check to be sure your fuel pump is pumping gas up to the fuel rails. You can usually hear the fuel pump kick on at the gas cap. I would change the fuel filter while you're at it. Just to be sure there's no trash caught within the filter.
check foe fuel pump presure at fuel rail,,,if u have fuel pump presure check all fuses with a test light not buy sight,,could be deceviving ,look at and check to see if fuel pump relay is working if no fuel presure i,if u have presure in fuel rail ,replace the cranck shaft sensor
If you have a schrade valve on the fuel rail, you can turn the key on
and carefully depress the valve to bleed most of the air out of the
system (valve is inside an aluminum or plastic cap similar to those
found on your air conditioning system) You don't have a carb on there
you have a throttle body...you can spray carb cleaner (not either) into
it while cranking and it may help.
Sometimes though, a marginal fuel pump will give up when run dry of
fuel. If pump cannot be heard with key on, check fuse and relay...if
good, pump may have expired. also, make sure filter is able to flow fuel before replacing pump.
You may have a bad fuel pump, First thing is to change the fuel filter since that's the cheaper of the two and you can find the filter under the driver's side inside frame rail.
Once that's been changed and you still have the problem then it's a good chance that it's your fuel pump has gone bad. Try doing a fuel pressure test and there should be a think 44 psi at idle, but please dubble check that it is 44 psi for your blazer.
Good luck and the fuel pump is in the gas tank, if your going to have to change the fuel pump, don't forget to change the wire harness from the frame rail to the pump since you have it apart. The harness is only $12.00 and that's a good investment if the wries are getting brittle and a broken wire will get you to drop the tank again.
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