99 pass port fuel pump problem

[Volkswagon]

I replaced just my fuel sender, which fixed my gas gauge problem.
Now, the fuel pump does not make the 3 second wirr sound to prime the system when the engines hot.

When the engines cools, no problem. It starts right up and you could drinve to Alaska, just don't shut off the engine!

what the heak is wrong?

[amigo-2k]

loose connection

[steveb_92rodeo]

I firmly believe that Amigo is right...

My Rodeo had this exact problem (with others too). For a couple days, I ran the fuel pump direct to battery (switched) and the problem did not reappear.

I then ran a new wire (with an inline fuse) directly from the relay to the fuel pump. Ran a new ground directly to the frame and I haven't had any starting issues since. That was about a month ago.

We have had -35c weather the past week, and still, starts and runs great.

I'd start by running the pump direct to the battery and I'll bet your problems will dissapear. (Make sure you fuse the wire though, I *think* it's 10A).

Steve

[Volkswagon]

Thats what I want to do, check for power and then run a new fused wire to it. I'll check it out over the weekend. And I have to say the response was very quick, this is amazing.

One question though, when you ran that new wire from the relay, do you still get the 3-5 second fuel pump prime sound or is it constantly on?

Does that make a difference? Why does it have to prime it up and then stop? Is that for safty reasons?

[steveb_92rodeo]

Originally Posted by Volkswagon

Thats what I want to do, check for power and then run a new fused wire to it. I'll check it out over the weekend. And I have to say the response was very quick, this is amazing.

One question though, when you ran that new wire from the relay, do you still get the 3-5 second fuel pump prime sound or is it constantly on?

Does that make a difference? Why does it have to prime it up and then stop? Is that for safty reasons?

I honestly didn't check. It just works. I know for fact though, that when it was from the battery, it was on full time.

I'm not to worried whether it shuts itself off after 3-5 seconds anyway...my 'zu is running by then ;o)

Seriously though, as far as I know, the pump is not variable, so no matter what state the engine is (high RPM, load, no load etc), the pump operates at the same speed anyway, so I figure no damage can happen.

The only reason I ran it off the original relay was so it would at least half-ways be the way it was, and I'd safely be able to use the ignition trigger to fire the pump properly.

It works, so it stays. I do stress again though, to use a good wire and a fuse.

I actually ripped off the back of the under-hood fuse box and brought the wire out of there. The fuse is outside the box, in a proper sealed fuse container so I can get at it easily.

Since I didn't know the exact path the original wire took, I though this was the easiest solution.

Best of luck, I was near ready to drop the tank and pull the pump.

Steve

[Volkswagon]

How long has it been runnig like that?

[steveb_92rodeo]

Originally Posted by Volkswagon

How long has it been runnig like that?

Just shy of a month now. Absolutely no problems whatsoever since.

I was so happy, I looked at everything before that, because everytime I put the fuel pressure tester to it, it worked. I didn't consider a loose connection at that point.

It was so frustrating, but things are much better now!

Steve

[Volkswagon]

I'll let you know. Thanks

[Volkswagon]

Pump still quits

[steveb_92rodeo]

Originally Posted by Volkswagon

Pump still quits

Time to drop the tank. It's either wiring inside the tank, or the pump itself has gone bad.

Steve

[Volkswagon]

yes when I directly ran a 12 volt line to it, it ran for a while then stops. After a while, it will run again, intermitently

[steveb_92rodeo]

Originally Posted by Volkswagon

yes when I directly ran a 12 volt line to it, it ran for a while then stops. After a while, it will run again, intermitently

I'm sorry to hear that. I was hoping it would be an easy/quick fix like mine (mind you it took me quite a while to find it out).

Good luck...let me know when you find out exactly what the problem is.

Steve

[Volkswagon]

St charles said maybe I have to have the ecu reset whenever replacing the fuel sender (which I replace) It worked for a while, then the fuel pump started acting up. I don't think resetting the ecu won't do anything since I ran a hot wire directly to it and got the said problems.

[steveb_92rodeo]

Originally Posted by Volkswagon

St charles said maybe I have to have the ecu reset whenever replacing the fuel sender (which I replace) It worked for a while, then the fuel pump started acting up. I don't think resetting the ecu won't do anything since I ran a hot wire directly to it and got the said problems.

I have read on many forums that some vehicles need the reset after a sending unit replacement.

Now, that said, the pump should run all the time if wired direct, however, the injectors are controlled by the computer. Are you certain it's the pump cutting out and not the injectors? Have you tried putting a pressure guage on the fuel line?

[Volkswagon]

But a hotwire to the fuel pump will energize it right?

In regards to fuel pressure, I don't have a fuil pressure gauge, but whenerver I press the fitting on the fuil rail, the gas squirts with very high pressure, so there is definite gas at the injectors.