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Here is a story on service intervals you might enjoy. Gent not far from me has a 1934 Aston Martin Rapier sports car, which he has had for a VERY long time. He has been in the habit of shipping the car to UK and Europe every few years, with other owners, for a holiday. In 1984 he was in England, and near the current Aston factory, so he went in.
'Can I help you sir?' says receptionist.
'Yes, I am here for my 50 year service'.
Got a service and lunch on the MD.
Open 2 door softtop, wire wheels, originally 1100cc, this one ~1500cc, 2xSU, 4 speed preselector box. Above average engine for the period.
This "in tank" fuel pump problem has me thinking that I have another project on my list(s) and it sounds like one I should jump on right away. None of my GT's or the GTS is likely to have had this pump replaced or serviced (think ticking time bombs).
I am getting two alternatives to dealing with the internal fuel pump from this thread:
1. Repair the hose.
2. Delete the pump.
Given the fact that I have three cars to do the service on, which is best for long term stewardship/ownership?
My take (so far) is to remove the pump, replace the offending section of hose with GB's solution and put it in a box to stay with the car it was removed from.
What do I need to buy to replace the deleted pump with?
FWIW my CIS car (higher fuel pressures - 75psi) did 10 years in Saudi (up to 120F, 2500' ASL) with a single external pump without issues. To delete the internal pump, you need the screw in strainer, and a stepped tank->pump hose. Tape up the wiring connectors and tuck them into the tank cradle - thats what the factory did, based on what I found in mine.
jp 83 Euro S AT 57k
Given the fact that I have three cars to do the service on, which is best for long term stewardship/ownership?
My take (so far) is to remove the pump, replace the offending section of hose with GB's solution and put it in a box to stay with the car it was removed from.
In cases where the in-tank pump still works I replace the hose and re-install it (*). I see no reason to ‘preserve’ it for the next owner. Besides, I would expect a used in-tank pump to seize if stored in open air.
In cases where the pump is seized, now that replacements are $1k, the in-tank pump gets replaced with the strainer assembly and the slightly different feed hose to the pump. And, of source, a new seal for the strainer. These are ‘87-88 parts listed in PET in the fuel section shown right next to the in-tank pump.
928 356 550 05 Hose
928 201 081 04 Strainer
928 201 187 02 Seal
And apparently the hose clamp is slightly larger. But, it probably won’t be like the originals. The original clamp works. But for completeness:
999 512 346 00 Clamp A20 (but you will get a worm clamp not a h-p clamp like the original.)
Bigger h-p clamps here: https://www.belmetric.com/norma-slot...143_1062_1736/
(*) @SeanR Keep that new seized in-tank pump. I may ask you to autopsy it at some point. Ii may be useful to know if there’s a difference in the anatomy of old and new pumps.
Once a long time ago I removed an in-tank pump that was seized, but, IIRC the hose was Ok and the 928 ran prior. So, I thought it possible for the pump to stop functioning without impeding flow to the point of starving the main pump. If it is possible for an old pump to seize and impede flow then that may be a reason to keep them in a (nitrogen-filled) box even if they work.
I’ll need to get one of the dead ones out, flay it, and see if it tells any secrets.
In cases where the pump is seized, now that replacements are $1k, the in-tank pump gets replaced with the strainer assembly and the slightly different feed hose to the pump. And, of source, a new seal for the strainer. These are ‘87-88 parts listed in PET in the fuel section shown right next to the in-tank pump.
928 356 550 05 Hose
928 201 081 04 Strainer
928 201 187 02 Seal
GT all buttoned up, sounded great! Dave will test drive tomorrow and I’ll pick up later tomorrow afternoon. Besides getting the GT all caught up on maintenance , working with Dave gave me a much broader technical understand of these great cars.
Also, the driver rear wheel liner all finished coated with “Flex Seal” went in, no problem and in one piece. Looks great and we will have to see how it holds up.
Picked up the GT today after Dave did a test ride this am to make sure all is well. Car ran great on the half hour ride home.
Besides using fender covers, Dave first covers the fenders and bumper with the white adhesive film you see on new cars being delivered. This makes sure that as the service covers move around, no scratches are introduced into the fenders. Really appreciate the care that went into the work that was done. Car is home and all cleaned and ready for the season!
Bob's GT is very uncharacteristic. Once you apply wrenches to it, it presents itself as a 10 to 15-year-old 928 not a pushing-30-year-old 928. The decade-plus it spent in a climate controlled "museum" dramatically slowed the aging process. Most, if not all, of the hoses we replaced had a lot of life left in them. In the end though, running around on ~30-year-old fuel lines, breathers, and ps hoses, just doesn't work for a GT of this caliber.
When we first started talking about doing this work last fall, Bob was 'resigned' to doing a complete intake refresh including cam covers and redoing the coating on the intake too. But, after seeing it last Fall for a few odds-and-ends, followed by some discussion we decided that a 'full monty' approach was unwarranted and that we really just needed to replace the 'standard' stuff. We were very careful with the intake to avoid any damage to the coating. It, as you can see, is still fresh looking. The coating is brittle and easily chipped but we didn't put any new chips in it during the work. With all new fuel hoses, high-steering pressure hose, breathers, idle/WOT, flappy actuator, Doc Brown's baffle, new bridge gaskets, new Laso and refreshed PKT bits, Bob's GT is ready for the next 10 years except for scheduled fluid changes.
Bob failed to mention that our Flex Seal brainstorm seems to work well. So far. Bob got the liner in with no drama at all (well, except for one speed nut that needed a two-over-sized captive washer screw.)
I hope Bob will report back to us on how it survives the trip to Atlanta and back.
05-09-2019, 03:37 AM
and these are for Dave's outstanding work... 
