250 GTE leaking fuel pump

as I remember there is no gasket, the gasket itself is the membran, but not sure. too long ago I did this and also have rebuilt some other fuel pumps.
could you post 1 or 2 photos? then I will just remember - hopefully

 

Hi Bob, I had a similar problem. What you observed as a gasket is actually the diaphragm (#6 in diagram). Sometimes overtightening the six screws (#31) can warp the flanges of both the top and the bottom halves, then fuel will leak from the joint. You can tape a whole sheet of 600 grit paper to a sheet of glass and mill the flanges with light and even strokes. After a couple of swipes on the paper look at the flange to see if you are getting uneven sanding marks. If yes, keep milling the halves until you get uniform sanding marks on the flanges, which means you have now removed the waviness from the flanges. I would apply soapy water to the paper as you go on this exercise. When reassembling, remember to not over-tighten. Use a sealant on the flange of the wet half. Good luck.

john

 

bob, so you mean gasket no. 12?
I think more the leak is from membran no.8
can you see exactly where the fuel comes out? just let only the electric pump run and try to find out. if only coming out a very little clean the pump, put some colored chalk powder on and let the electric pump run. you will see soon where the color changed.

 

Hi Bob,

if it is just coming from 12 you can change the gasket and do not have to touch the membran. It might be hard to do it in place because of the limited space and the springs pressing against part number 3. If you need to remove the pump to do it it is only two screws and the two hoses.

See that the flange of the pump is straight when you have the top removed.

 

H Bob,
I have rebuilt quite a few of those pumps. I would recommend removing the pump ( it is quite a mission) because if one seal is old and cracked the others might not be far behind. It is a bit of extra work but might be worth it in the long run. It is relatively simple pump so once it is out of the car it is not that bad. Good luck.

 

Don't forget to drain all the fuel from the gas tank otherwise it will gravity leak out and make a big mess. Most of the FISPA mechanical fuel pump kits availible are no good.

 

John’s post is correct. ALL the surfaces tend to warp and should be checked and flattened as he describes and then replace with the correct ethanol safe components available from most suppliers.

 

not use gasket sealer ! ! !
I think the housing then is cracked. had this also once.
dry the pump and clean from outside. then put powder from your wifes face masking on and see where the powder get wet first. then you will know.
you had the pump out? if so then I wonder why you not have seen anything wrong

 

could it be that not the housing is broken, only the fuel hoses adapter leaking?

 

great ! ! !
you may use fiber gaskets for the adapters, no copper and no aluminum ones