89 928 turbo

So,

I started having intermittent fuel pressure issues and went through a variety of diagnozis that put me after the internal fuel pump on my 89.

Sure enough when I got it out, the small connecting hose was split and likely the cause if not contributor to the variable to no FP I was experiencing.

Here's the problem though, when I unscrewed the pump and pulled it out, the aluminum bushing that is seated in the rubberc/plastic transition in the tank came unglued.....or unepoxied.....pretty soft stuff on there from the factory, almost rubbery....not at all what I would have expected.

I need to find some epoxy for rubber to aluminum and can handle being in fuel..

any suggestions would be appreciated.

Also, Andrew if you read this, can you direct me to your supplier and the thread on going to a single external pump and a replacement screen for the intank unit?

Thanks,

JT

ROG100

There is a seal that goes between the pump/strainer and the tank. It would appear that was missing.
The strainer is a readily available part for $47.77 and comes with the correct seal.
As for the single pump maybe a 044 - refer to Andrew for the correct answer.

89 928 turbo

Thanks,

My other need is to figure out an appropriate expoxy for plastic to aluminimum to re-insert the threaded sleeve back into the tank.

Hoping someone has seen or done this.....I don't really want to use JB Weld

Mrmerlin

I used some PRC to seal the hose inlets on my tank and some cracks along the top, its for use in jet fuel tanks it is a 2 part epoxy and takes about 5 days to set up. You should be able to get some from you local aircraft parts sell usually located near a big airport. Check the yellow pages This stuff might also be called a different name and might be MFGed by a company called Flamemaster( the stuff is dark tan )

89 928 turbo

thanks,

I have a friend that was on the same track.....small local company that does airplane mechaniking...lots of aluminium and plastic parts....I'll try and post some pictures with what came unglued, I can't imagine mine is the first....



jt

Tails

I repaired a leaking in tank fuel pump on my car nearly 8 year ago by using a 2 pack epoxy called "5 minute Arildite". No leaks since.

Tails 1990 928S4 Auto.

Mrmerlin

The PRC is a flexible adhesive/sealant and its fuel resistant but i am not really sure of what you need to reaatach a picture would be good , and Tails may be on the right track

jpitman2

PC11 make a fuel proof epoxy, I used it for several years on mine when the insert spun. When I gave that tank away, a friend pulled the insert out, cleaned it up, fitted epoxy, pulled the insert into place from inside the tank with a wire, and it works fine.
jp 83 Euro S AT 51k

Vilhuer

Boat stores usually sell eboxy which will not dissolve into gasoline.

89 928 turbo

Thanks all,

anyone know what type of plastic the tank is made of and what type of plastic the transition sleeve that holds the aluminum threaded sleeve is.

Finding an aluminum epoxy is pretty straightforward, but it seems from the research I have done so far, it seems to make a difference on the type of plastic I will be trying to adhere to. So, it needs to be both for aluminum and whatever type of plastic it is.

Marine applications seem to have the broadest cross over.

jt

Jim bailey - 928 International

The threaded aluminum ring was molded into the tank when it was made. There are some small holes in the ring which allowed plastic to flow into them which helped keep the ring from turning. The ring was NOT glued in place originaly. We have seen cars come in with all kinds of stuff being used to "FIX" them most with little success. The problem being fuel will leak out the threads (they are not tapered pipe thread) so the seal on the outside flange MUST compress to keep it from leaking. The tank is made of Lupolen 4 261 A which is a BASF product.

89 928 turbo

Well, that's pretty darn interesting.....it tells me a previous owner had been through this before on my car. When the piece came out, there was a thin, rubbery coating on the aluminum threaded sleeve.

Hmm......the sealer flaked off in 1/4 inch diameter little flakes. This also suggests that the reason they were in there was after the internal pump......which subsequently failed.....it may be worth replacing the rubber bit in the internal with something of higher quality before reassembly with the new pump I have on order.

Thanks Jim for the info on the tank, there seems to be unique piece that was incorporated into the tank that is a bit different from the tank, that the sleeve presses into, but now a will look at it a little closer to see if it would be a different plastic....or just the difference in dirt.

We have a spare tank in our parts car if it will fit from an 86.5 to 89 if needs be.

Jim bailey - 928 International

The 1980-1985 tanks are the same