No start fuel issue

Tiny
BULLITT1939
  • MEMBER
  • 2006 FORD MUSTANG
  • 4.6L
  • V8
  • 2WD
  • AUTOMATIC
  • 10,000 MILES
Car is the GT model. No start fuel issue. Fuel pump is kicking on have spark and will start with starter fluid. Brand new fuel pump assemble And battery.
Sunday, May 19th, 2019 AT 6:00 PM

8 Replies

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 108,581 POSTS
Welcome to 2CarPros.

Have you confirmed fuel pressure to the fuel rail? If you have and pressure is correct, then you need to check for an injector pulse to the fuel injectors.

Here are two links. First, how to check fuel pressure. The second explains how to check for injector issues.

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

https://www.2carpros.com/articles/how-to-test-a-fuel-injector

I don't know if you need them, but here are some general links showing how to use the basic testing equipment for checking the injectors.

https://www.2carpros.com/articles/how-to-use-a-test-light-circuit-tester

https://www.2carpros.com/articles/how-to-use-a-voltmeter

https://www.2carpros.com/articles/how-to-check-wiring

Let me know. If the pump is new, you hear it running, then either something was put together wrong at the pump, there is a blockage or kinked line, the fuel pump can't produce pressure even though it runs, or the injectors aren't getting a pulse from the control module to fire fuel into the engine.

Let me know what you find.

Joe
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Sunday, May 19th, 2019 AT 8:04 PM
Tiny
BULLITT1939
  • MEMBER
  • 33 POSTS
Brand new pump it is priming. This car doesn’t have a Schrader value I don’t think. So not sure about pressure yet! Noid light checked out fine so injectors are pulsing.
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Sunday, May 19th, 2019 AT 8:09 PM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 108,581 POSTS
Welcome back:

As far as pressure testing, do this first. Check for diagnostic trouble codes. There are different sensors in the fuel system that can be causing an issue.

Next, if I recall, you have to place a T in the fuel line where it joins to the rail to get a pressure reading.

Next is the fuel pressure sensor. Here is the manual's description of the component:

The FRP sensor is a diaphragm strain gauge device in which resistance changes with pressure. The electrical resistance of a strain gauge increases as pressure increases, and the resistance decreases as the pressure decreases. The varying resistance affects the voltage drop across the sensor terminals and provides electrical signals to the PCM corresponding to pressure.

Strain gauge type sensors are considered passive sensors. A passive sensor is connected to a voltage divider network so that varying the resistance of the passive sensor causes a variation in total current flow. Voltage that is dropped across a fixed resistor in series with the sensor resistor determines the voltage signal at the PCM. This voltage signal is equal to the reference voltage minus the voltage drop across the fixed resistor.

The FRP sensor measures the pressure of the fuel near the fuel injectors. This signal is used by the PCM to adjust the fuel injector pulse width and meter fuel to each engine combustion cylinder.

I attached a picture of this sensor. Make sure it is connected and nothing is damaged or corroded.

Let me know.

Joe
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Sunday, May 19th, 2019 AT 8:35 PM
Tiny
BULLITT1939
  • MEMBER
  • 33 POSTS
I have about three different scan tools. No codes reported. I have another FRPS I can change out. I have a brand new as they go out from time to time and we have several cars in our collection.
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Monday, May 20th, 2019 AT 8:42 AM
Tiny
BMDOUBLE
  • MECHANIC
  • 1,139 POSTS
I would also get a fuel sample and see if it will ignite on its own, safely pour a tablespoon or so on the floor and light it. Also make sure there is no water in it.
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Monday, May 20th, 2019 AT 1:45 PM
Tiny
BULLITT1939
  • MEMBER
  • 33 POSTS
Okay. Finally around to messing with this car again. Fuel pump comes on like it is priming, but no fuel coming to fuel filter or fuel rail. We tried turning it over with fuel filter disconnected to see if we had fuel to this point. No fuel on prime. We went ahead and replaced filter at this time. The connection to the rail is also dry. Any ideas?
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Thursday, April 30th, 2020 AT 9:35 PM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 108,581 POSTS
Hi,

If you hear the pump actuate and there is no fuel, either something is disconnected, connected wrong, or the pump is bad. I realize the pump is new, but I have seen new pumps not work.

Let me know. You may have to remove the pump and bench test it.

Joe
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Friday, May 1st, 2020 AT 8:20 AM
Tiny
BULLITT1939
  • MEMBER
  • 33 POSTS
Turns out brand new pump was bad. Took it out and bench tested it. It was coming on, but not pumping any fuel. Replaced it with a new and everything is working again!
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Sunday, July 5th, 2020 AT 2:50 AM

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