Question about 1999 Ford Taurus

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Will the bad tach cause the injectors and fuel pump to stop .

The tach was ok. then the car would not start and i noticed the tach was out. tested power at fuel pump , no voltage. when i shot starer fluid into throttle body it ran briefly.

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Based on what you described, you don't have fuel coming out from injectors since you don't have gas providing to fuel distributor from the fuel pump.

Your diagnose starting with the fuel pump is a right approach. However, the method of checking may involve a little more complication than itself.
Here are some simple things to check, if it sounds complicated then leave it for professional.

1- Turn the car key on, but not start, then listen to the fuel pump motor whizzing . If you don't hear anything, your pump is not working.

2- If the pump is not working then check the pump relay. you need to know terminals layout of the relay, so when you pull the relay off you know how to probe electric signal to see if you have the relay can be enrgized or not.

3- It the pump is working, then unscrew the gas line coming into the fuel distributor.

4- Hook it up with a glass container or some sort of container to catch the fuel coming out.

5- Try to start the car to see if fuel is coming in the container.

6- If it is, then your pump and your relay are working. however, your pump may be week to deliver appropriate flow to meet the pressure spec.

7-Find a way to jump fuel pump terminal with the pump relay off so you can measure how much gas flow to your container with the jumper on for 60 sec. the rate of flow is the gas quantity in the container in ml (cc) divided by 60 to have ml per minute. Then check with your car spec. If it is not meeting spec then replace the pump.

8- If you OK after all of that and the start is still not working then you will check the injectors spraying fuel started to determine your fuel distributor is working or not.

Posted on Jul 19, 2009

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The short answer to this is: probably not. If you have no power to the fuel pump, then you probably have no fuel pressure, and consequently no flow through the injectors. While it is possible your tachometer issue is related, what you must remember is that the tachometer actually runs through a signal from your primary igniton coil, and not from actually measuring actual engine RPM's. In other words, the tach only shows what the car's computer (or PCM) THINKS the engine speed is, based on how often the coil or coils are being fired. Additionally, the engine RPM is so low during startup (usually only 200-300 RPM) that it can often not be turning fast enough to be noticable during startup, and that's even if your vehicle is DESIGNED to show engine RPM during startup. If starter fluid temporarily got the engine to turn over, I'd say you definitely have a fuel system problem. If your issue were with your coil or tach (i.e. ignition system) then your spark plugs would not be firing, and no amount of starter fluid in the world would help. Now, that being said, your fuel pump may or may not be the issue here. Unfortunately there are quite a number or things which could cause a lack of fuel pressure, and without more information it would be a shot in the dark to pick one. But, hopefully this at least answers this question

Posted on Jul 19, 2009


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