fuel pump problem

[Harvy]

OK - first off......there is no fuel leaking anywhere and I do not have fuel in the oil.

Normal fuel pump behaviour when turning the key on is for the pump to run until back pressure slows it down to the point that it stops. Once the engine is started and fuel is being used, it ticks away fairly slowly (depending on how fast the fuel is being used).

A couple of days ago, while heading home from work the FJ started to splutter (I was low on fuel) so I filled up at the servo just a couple of kms further up the road.

Now I am thinking the fuel pump is on the fritz.

Symptoms are that it runs flat out constantly, whether the engine is running or not.

Is a replacement of the points in the pump the answer, is the diaphragm shot? I've never pulled one apart to see what's in it, so if anyone has a clue?

Is it a solenoid pump or a diaphragm pump?

Cheers
Harvy

[Arnie]

Harvy,

Sounds to me that the diaphram has a hole or tear in it. :-(  I don't know if you can get a replacement for the diaphram, but replacement pumps aren't too dear.

Cheers,
Arnie

FUEL PUMPs
  Brand                   Part No      Pressure Range   Max. Flow
 FEDTRO      FED-40104    1.5 – 3.5psi   28 gph
 FEDTRO      FED-40105    2.5 – 4.5psi   30 gph
   Sold on Ebay.au by       the_auction_broker  (Philip Island)

* FuelFlo        015        1  -  4psi   23 gph  1.5Lpm   
   Repco supplied for A$110.00

Airtex -       ES8016S      2.5-4.5 PSI   30 GPH
5/16" hose barbs   It is a solenoid pump that stops fuel if no power

[RichBaker]

This got my interest, the same thing has happened a couple times to me.....  Last time was a few weeks ago, after I pulled the tank off. Reinstalled everything and the pump just kept running. I knew I had turned the petcock back on, so I took her for a ride around the block.... got home and everything was back to normal.  It was a year or so ago that it happened the 1st time, same "repair"...  This time I got to wondering if the pump was giving me a sign.... it is original.

[Harvy]

This got my interest, the same thing has happened a couple times to me.....  Last time was a few weeks ago, after I pulled the tank off. Reinstalled everything and the pump just kept running. I knew I had turned the petcock back on, so I took her for a ride around the block.... got home and everything was back to normal.  It was a year or so ago that it happened the 1st time, same "repair"...  This time I got to wondering if the pump was giving me a sign.... it is original.

Yes Rich.... I believe it is!
I'm going to grab 1 of those fuelflow models that Arnie posted about. Then I'm going to pull the OEM pump to pieces to see what the story is.

Harvy

[Harvy]

I bought a Fuelflo 015 and installed it a couple of weeks ago.........symptoms all gone. The pump is now behaving itself.
I have not as yet dismantled the OEM pump, but will one of these days, just for my own curiosity.

And to steal my own thread......

I installed a Dyna 2000 ignition system about 6 months ago following spark problems at around the 6000RPM mark.
In doing the install, I dropped both the connectors out of the OEM ignition box.
In doing this, I had the unwanted result of disconnecting the side-stand cut-out, the engine stop function, and the no start in gear function.

After having a good long look at the wiring diagram, I decided to plug the connectors back into the OEM ignition box this weekend and you guessed it - all the safety functions are returned to normal.

This in no way was related to the fuel pump problem, as the OEM pump worked normally until three weeks ago, and the replacement pump was installed and functioned as expected for a week before I reconnected the OEM igniter.

Cheers
Harvy

[andyb]

I bought a Fuelflo 015 and installed it a couple of weeks ago.........symptoms all gone. The pump is now behaving itself.
I have not as yet dismantled the OEM pump, but will one of these days, just for my own curiosity.

Glad you sussed it!

And to steal my own thread......

I installed a Dyna 2000 ignition system about 6 months ago following spark problems at around the 6000RPM mark.
In doing the install, I dropped both the connectors out of the OEM ignition box.
In doing this, I had the unwanted result of disconnecting the side-stand cut-out, the engine stop function, and the no start in gear function.

After having a good long look at the wiring diagram, I decided to plug the connectors back into the OEM ignition box this weekend and you guessed it - all the safety functions are returned to normal.

This in no way was related to the fuel pump problem, as the OEM pump worked normally until three weeks ago, and the replacement pump was installed and functioned as expected for a week before I reconnected the OEM igniter.

Cheers
Harvy

So what you're saying is that electrical circuits work best when connected.  Who'da thunk it?   

[Harvy]

So what you're saying is that electrical circuits work best when connected.  Who'da thunk it?   

Andy..... well sort of.
I had not taken into account that those circuits need to be connected thru the Igniter box. My initial read of the wiring diag had me believing that the relay box was sufficient for them to perform their duties........ my bad!


Harvy