New report on fuel pump for type 3
Altho no one has said why new/rebuilt working 3-port pumps cannot be found, I have verified in testing an inline 2-port Walbro pump GSL392 for replacement . It requires ~7 volts & ~5 amps for good flow & 28 psi+ pressure. I put 1 ohm resistor in series to take up extra power rather than overdrive pump & fuel, as seen & heard.
Instructions with pump give no specs & are short on electrical & plumbing. Need to rig water-proof connection to 6-32 thread terminals with #12 wire splicers & maybe add silicone. Use spades to go in original pump connector. Couple on J-bend of 15 inches of 5/16 copper tubing to bring outlet around near inlet for connection to VW’s fuel damper & to main line. Inlet connects to filter & tank. (Pump has 1/8 FIP threads; use their pipe to barb adapters & copper seal, or other 1/8 plumbing. VW system does regulation & only returns to tank) .
Room under tank to rig clamp to put pump where old one was, BUT pump needs ~11 inches & must mount higher, farther back, and closer to car center, by ~ 2 inches each, with new hole in plate, standoff, & redone clamp.
For a good short illustrated report on theory & rebuild of 3-port pump, see document on British Type 3&4 Forum. It doesnt cover all issues. A link is in post after my post, on their Workshop.
Thanks to several advisors under my first fuel pump topic to get this far.
new report on fuel pump (Walbro inline) for fuel injection
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