Question about 1998 Chrysler Town & Country

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Fuel pressure specs

3.8 L v 6 what should the fuel pressure be at the fuel rail

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49 psi

Posted on Feb 09, 2012


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How to test fuel pressuer on a mazda 929

Find your test valve on your fuel rail (under the hood) and you will need a fuel pressure regulator gauge to check the pressure. You can also look up online the specs for the pressure recommended. You did not provide your size engine so i could not look up specs for the pressure. Hope this helps.

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most fuel rail pressures are around 60-65 psi for optimum operation
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Car dies once it warms up

You hook up a fuel pressure gauge to the test port on the engine's fuel rail, and see if the pressure is correct with what is specified for the car. If the pressure is correct, the pump and filter are good, doing what they are supposed to do. Some stores loan or rent fuel pressure gauges. Multiport fuel injection systems usually have high pressure requirements-about 40-50 psi. Check the specs for your car. Usually, the specs call for a pressure with just key on, no start, and a second pressure (maybe 3-10 psi lower) with the engine running.

When it dies, can you immediately restart it, or do you have to wait a bit? Probably fuel or spark related, Any trouble codes present?

Aug 16, 2014 | 1995 Nissan Sentra

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I just changed the fuel pump in a 1990 firebird. There is still no fuel to the fuel injector

Check fuel pressure at the rail. If it's not within specs, check the pressure relief valve on the fuel rail - the one that feeds fuel back to the tank.

If the pressure IS within specs, it's time to start seriously suspecting the car's computer.

Aug 04, 2014 | Cars & Trucks

1 Answer

How to check fuel pressure

With a fuel pressure gauge. If there is a test port called a schraeder valve on the fuel rail on top of the engine, it's easy. If no test port, you have to tee off the fuel line somewhere convenient (like right after the fuel filter) and hook your gauge up there. Hook the gauge up, make sure of no leaking, turn key to on, and read the pressure (it will read the same pressure in the line as at the fuel rail). Check pressure with key on, and then with engine running- if at the specs for your vehicle, it's good. If pressure is below specs, pinch off or pull off the vacuum line to the fuel pressure regulator, and see if pressure raises. If it does, try another pressure regulator. If no change, check the fuel return line for restrictions, check or replace the fuel filter, or suspect a poor performing fuel pump. On MPFI systems the pressure should be about 50 psi, but find the specs for your vehicle.

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How to hind out if fuel pump is working

easiest way is to use a fuel pressure gauge that will connect to the fuel rail and read the pressure coming from the pump. You will need to know the spec pressure for your car. Follow the instructions for connecting a fuel pressure gauge to the fuel rail. Careful to clean up any expelled fuel on the engine. Turn the key to the on position and wait for the pump to build pressure, normally about 2 seconds, and read the gauge. Compare the gauge reading to the specs and determine if the pump is delivering the required pressure. You can rent a fuel pressure gauge from many automotive parts stores if you don't have one.

Sep 25, 2012 | Daewoo Nubira Cars & Trucks

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My engine is turning over but it wont start but if we spray starting fluid in it it starts and runs fine

You may have a problem with the fuel pump or some current problemin the system of feeding the fuel pump

Mar 01, 2011 | 1995 Chevrolet Blazer

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No fuel pressure in injectors

If the fuel preessure reg. is on the fuel rail after the injectors before the return line and is clogged fuel pressure will be higher than specs.but will be in the fuel rail.If reg. is before the injectors(as in at the beginning of the fuel rail) and it is clogged then there probably wont be any fuel in the line. I beleive the injectors may be the point of concern.Check the injector fuses first.

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check fuel pressure on fuel rail to ensure good fuel pressure according to specs for van. also check fuel pressure regulator look for fuel coming out of the vaccum line. if it is then replace it

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1 Answer

Car doesn't seem to get enough gas to engine

check pressure on fuel rail using propper fuel pressure gauge if its not to manufacturers specifications replace fuel pump if it is to manufacurers spec then replace fuel pressure regulator on the fuel rail thanks good luck with projects

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