Looks like the fuel pump went out in my 99 mustang. Looking at instructions for RRing the pump it appears there are a bunch of rubber hoses and gaskets for various things, fuel filler and emissions control system that all have to come apart to get the tank out. No mention was made in what I've seen so far about lubing the tubing when putting it back together. I don't want these things to leak and was wondering if a thin application of silicone grease would be a good or bad idea to help prevent leaks or should I just put everything back together dry?
I don't normally lube hoses unless there is no other way. IMO, silicone is a bad idea. Hate to have it come off while driving. Clean and dry is better but if you have to lube it then use gasoline.
Got the pump replaced. What a pain to get the tank out. Seems like a million vapor and gas lines to disconnect. And the filler tube is a real pain. Wound up breaking off the anti-siphon valve from the end of the filler tube when the tank shifted as I was lowering it. It
*could* have been designed better so it was easier to get the dang thing out. New pump and it runs again.
Funny thing about when the old pump was not working. Even though the pump was not working I was able to start the car with a bit of priming and it continued to run. I had a fuel pressure gauge on it and the pressure remained zero. I thought maybe the fitting was somehow clogged even though I had taken the shrader valve out. Took the gauge off while the car was running and no fuel at all came out of the test port (no valve in it) on the fuel rail. Yet the car kept running and I would even rev it up. Put it in gear to put a load on it and while it didn't run as smoothly as normal it still ran with the load applied. I would conclude that the engine vacuum was able to pull enough fuel thru the system, even with the pump not running, to allow the engine to run. With the new pump there is again pressure in the fuel rail. Altogether the whole pump assembly is fairly bulky, the actual pump is really quite small, only about an inch, inch and a half in diameter and 3 or 4 inches long.
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