Fuel pump burn out

M

MichaelDenmarkP6

New Member
Hi, I think its called burn out when the fuel pump simply are broken beyond repair. I have once again been forced to get a new pump for the P6. New, and its number six in two years. Carefull measurements from the alternator shows that alls ok. The fuse in front is 25 amp.

But it must be something electric, pulses, temporarily failing somewhere? The fuelpump now mounted is again a Hard pump, the same as used in the Jaguar XJ6.

Please, do anyone have an idea? I find it unsecure to take my lovely wife in the Danish countryside and leaving the car to be towed to the kind garage.
 
This one?

Kraftstoffpumpe 13312 (12V / bis 60PS) - HARDI Automotive

Bis 60PS? I think you've got more than double that.

According to this:

https://www.hardi-automotive.com/wp-content/uploads/Hardi-engl-Fahrzeuge.pdf

You need model 9912.

Why not use the Hüco everyone else does? These are cheap and I've never known any to burn out. Note that the fuel flow is rated at 27.5 gallons/hour and not 9 gallons/hour as yours is! No wonder it "burned out"!

Huco low pressure 12v fuel pump 133010 - Eurocarb
 
Thank you very much for your kind help. Its very easy why i don't use the other one "as everyone else" - just simply because i did not know it existed. I have followed what the garage have done. Will buy one now.
 
Just to be clear the P6 won't burn that much fuel in an hour, it pumps fuel back to the tank in the return line.
 
MichaelDenmarkP6 said:
Thank you very much for your kind help. Its very easy why i don't use the other one "as everyone else" - just simply because i did not know it existed. I have followed what the garage have done. Will buy one now.
Click to expand...

Hi, there are lots of answers in this forum, I've saved a fortune by reading it. I didn't mean to be rude in my reply.

If your garage incorrectly recommended the pump, they should cover the costs of replacement IMHO. They've also wasted your time. I'd be slightly wary of them if they made what is a fairly basic error which with a little reading they should have avoided. The car isn't complicated by modern standards but it is very quirky and unconventional, but this is basic stuff that applies to any old car and they should get it right every time.

I've got a very good mechanic but I do read up on jobs before I go to him and I do have the factory manual which I leave in the car. Brakes and suspension are unconventional, a bit tricky and of course safety critical, make sure they know what they are doing.

As with any electric pump, it's better you fit an inertia switch cut out for safety.

The poor little pump was working its little heart out! They look very nice quality though.
 
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Thanks. The garage are so very kind and helpfull that i do not want to blame and ask for return. It might even com on automatically. I will also ask them to mount an inertia switch. Of course.

I hope to have it done and fine soon, its just these days it perfect driving time
 
Looking at the Hardi pump spec it flows 60 to 80 litre per hour at up to 3 psi, and has 8mm tails, this should be perfect for a 3.5 litre.
The only time I have had a pump burn out it was because there was not an efficient enough vent to the tank.
I wonder has someone taken off or blocked the tank vent system ?
 
cobraboy said:
Looking at the Hardi pump spec it flows 60 to 80 litre per hour at up to 3 psi, and has 8mm tails, this should be perfect for a 3.5 litre.
The only time I have had a pump burn out it was because there was not an efficient enough vent to the tank.
I wonder has someone taken off or blocked the tank vent system ?
Click to expand...

Hmm, by their own recommendation they list this for the MGB GT V8: https://www.hardi-automotive.com/wp-content/uploads/DB9912.pdf

100-130 litres per hour or 22 to 28.6 imperial gallons. About the same as the Hüco. It's not impossible it's blocked but I'm guessing one listed for a Mini (2nd link) might be a little weedy for the V8.
 
MichaelDenmarkP6 said:
Hardi model 13312
Click to expand...

I used to use this pump in the Austin. The first one lasted enough years, but when it started to fail, it did so interminently, so diagnosis was a nightmare. Eventualy i replaced it with a new one, only this one failed in a few months. I though it was just bad luck, so i went for a third one, which was just as bad from the beginning, so more of a bad batch. All of them kept stopping for just a few seconds, so it took me some months to find out the cause of the missfire. I could not believe that a new pump would fail like this. Eventualy the shop i that i bought them off refunded me their cost. Since then, i went back to the good old SU's with the points. I still have the last one Hardi in its box, looking new, but i just don't want to see them again. They gave me so much grief back then...
 
I have same thing. however, i would like to check the breathing from the tank. Could i please get a hint where to do it?
I must get to this problem, because now im at the point of being afraid to drive it, and that a ver bad thing
 
Look around the top of the tank and you will see the vent tubes, pull the tube off the tank and see if you can blow through it easily. Then connect a piece of tube onto the tank and see if you can blow into the tank, if they are all clear at least you can discount bad venting as a cause.
Going by Demetris' report above though it looks like you need to change pump manufacturer.
If you are going for a larger output pump and need to find a pressure regulator may I suggest the you steer well clear of these.....
sytec fuel regulator - Bing images

They are the most poorly made nasty things ever and will leak and present a fire hazard very quickly after fitting.
 
So, the ventilation to the tank is not to blame. Fine and clean. Have been driving 4 x 20 km in the car, and i can hear the pump working. Constantly driving with a feeling that it breaks down in few minutes. My guess is something periodically electrical. Can the alternator have a failure, giving too much sometimes. All has been meassured and is in the limits. I wish i could trust to get home every time i drive it.
 
Not sure the fuel pump would be first to go if the alternator were at fault. I'd guess you'd fry the ignition or battery first.

It's easy to measure borrow a simple multimeter (hell you can buy one these days for €15), rev the engine and if you get anything much over 14.6-14.8 then you have a problem.

I still think you simply have an inadequate pump.
 
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