Re: Bosch fuel tube report
August 26, 2003
On August 9th, Bosch realized a failure of their fuel pump/filter unit for a new model fuel tank. In the past they used a ½” gasket on the old fuel tank, when GM changed the design, this became a problem. There was no longer a ½” gasket, thus causing problems for the pump to retract all the way to the top flange of the pump unit. The top flange has a rough grove on top where the fuel tube comes in contact. I was asked by Bosch to investigate a more durable abrasive sleeve then the one they currently using.
Bosch uses a GPT-483 3/8” (131,843 cycles to failure) sleeve for their current application. By the use of SAE ARP 1536 test method, I was able to make a few recommendations on Sofanou sleeving products. The product line that I recommended is; Nu-Guard NTW-WR ½” (1,163,483 cycles to failure), Nu-Guard DPT 3/8” nylon 6, 6 (new to Sofanou product line) (356,425 cycles to failure), and Nu-Guard N 3/8” (295,198 cycles to failure).......
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