Mechanics

FUEL PUMP

2000 Dodge Intrepid

Electrical problem
2000 Dodge Intrepid 6 cyl Front Wheel Drive Automatic 202000 miles

my car wouldnt start and the mechanic said that I needed a new fuel pump so I had one put on there, and my car still want start so someone else told me I needed a fuel pump and the mechanic said that he needs to figure out the components to a fuel pump for my car that would make it not start. It sounds like it wants to start, it has gas in it, the fuel pump is new so what components would make it not start?
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Sundaet8088
April 23, 2009.



Your description doesn't make sense. Am I to understand you were told your car needed a new fuel pump, they installed it, and it still wouldn't start? So then what? You paid the bill and pushed the car home? No one would pay for a repair that didn't solve the problem. How could they justify handing you a bill for diagnosis if it didn't solve the problem?

The only exception would be if you specifically TOLD him to put a pump in based on what someone else told you. In that case, he deserves to get paid for doing what he was asked to do.

Why would someone tell you it needs a fuel pump when you just had one put in? Did they actually diagnose it or just give you an opinion based on the symptoms?

I strongly suspect you misunderstood what the mechanic told you about " components". If the pump didn't solve the problem, he's done with looking at components that make up the fuel pump, as you suggested. He's probably referring to other components in the SYSTEM. The fuel pump is just one part of the entire fuel system. There's an Automatic Shutdown relay, possibly an additional fuel pump relay, they're turned on by the engine computer when it gets pulses from the crankshaft position sensor and the camshaft position sensor. There's fuses, wires, connectors, pressure regulator, filters, etc.

Did anyone check for spark? There's a lot of common problems that will cause loss of spark AND fuel, but if you only check for fuel problems, you're diagnosing the wrong system.

The fuel pump relay can be easily bypassed to see if the pump runs. Start by checking for spark. If that's missing, you don't have a fuel problem.

Caradiodoc

Caradiodoc
Apr 23, 2009.
I was saying that the mechanic who fixes my car checked to see why my car wouldnt run and he said that it wouldnt run because I needed a new fuel pump. After that I went 2 get a second opinion and I was told the same thing, so I went back to the first guy we brought a new fuel pump, he tested the fuel pump at the store and there were sparks and some kind of buzzing or humming noise and he put the fuel pump on 4 me, after putting the fuel pump on he said my car still wouldnt start, he said he noticed that there wasnt any fire or sparks getting to whatever makes the car start, he said there should be like some kind of compression that make fire. So he said its probably some small component on the fuel pump thats not working. Or it could be my ignition coils but when he tested those the reading was good and he had never seen 6 coils go out at one time b4, so I wanted to know what component or part would make my car sound like it wants to start but not start, it has gas, a new fuel pump, my check engine light is not on, and my car will not start it just make the stalling noise before a car starts

Tiny
Sundaet8088
Apr 23, 2009.
Sounds like your mechanic doesn't understand this simple system or something is getting lost in the translation.

Which fuel pump was tested, the new one or old one? Sparks coming from the pump motor are common. It won't cause a problem in the tank because there's no oxygen in the tank to support combustion. Sounds like he was talking about a " lack of spark" meaning the spark plugs are not firing to ignite the fuel in the engine. That should have been the first test performed. That would have ruled out a defective fuel pump. If spark is missing, AND the fuel pump doesn't run and the fuel injectors are not firing, chances are the Automatic Shutdown relay isn't being turned on. It powers the ignition coils, injectors, alternator, and fuel pump or pump relay among other things.

A real easy way to tell if the Automatic Shutdown relay is turning on is to measure for 12 volts on the two small wires on the back of the alternator while cranking the engine. If it's missing, the engine won't run. The most common cause is a defective camshaft position sensor. It's right on top in the front of the engine. The crankshaft position sensor is another possibility, but much less likely.

Caradiodoc

Caradiodoc
Apr 23, 2009.
How much do you think a camshaft position sensor would run me for? Should that be the problem because he said its getting fuel but not compression or spark

Tiny
Sundaet8088
Apr 23, 2009.
If there's no compression, you have a timing belt issue. If it's broken, the cam won't be spinning so there won't be any pulses coming from the cam sensor.

Caradiodoc
Apr 24, 2009.