1994 Buick Century, 3.1 V6 Problems! - Page 3 - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


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Old 02-26-2014, 09:37 AM   #21
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I ordered a new fuel sender / pump assembly

http://www.amazon.com/gp/r.html?R=2H..._26725410_item

Should be here next week.

My thoughts are since the vacuum side of the fuel system was disconnected near tank (cut, fell off) and engine (vaccuum hose was out of Evap can) no telling how long it these were disconnected. Over time this non vacuum put a lot of strain on the pump causing it to wear down.

Thoughts?

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Old 02-26-2014, 10:38 AM   #22
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evap side shouldnt have anything to do with the pump. you see what the pressure is with it running vacuum line disconnected? i had bad pressure regulator before new out of the box. it was a wells one and it gave me the wrong pressure. i had already replaced the pump though so i knew right off it was bad, took it back and got a delco one and it had the right pressure.
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Old 02-26-2014, 11:12 AM   #23
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Old 02-26-2014, 11:14 AM   #24
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Quote:
Originally Posted by jwfirebird View Post
evap side shouldnt have anything to do with the pump. you see what the pressure is with it running vacuum line disconnected? i had bad pressure regulator before new out of the box. it was a wells one and it gave me the wrong pressure. i had already replaced the pump though so i knew right off it was bad, took it back and got a delco one and it had the right pressure.
Well, it'* running the same before I replaced the regulator, so I don't think its that.
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Old 02-26-2014, 11:23 AM   #25
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Old 02-26-2014, 12:18 PM   #26
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first of all, you know the engine is running lean due to the lack of fuel pressure, so revving it like that is a good way to melt your pistons.its not helping solve anything, you need to get the fuel pressure to proper spec. second the time i had the reg go bad it ran the same on mine too because the pressure with the old bad one was the same as the new bad one. try running it at idle for a second and pop the vac line off the reg, it should go up some let me know what you get
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Old 02-26-2014, 12:44 PM   #27
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Old 02-26-2014, 01:04 PM   #28
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either the regulator is bad or the vacuum source for it. the needle should be going from like 45 to 35 back and forth and that one isnt moving at all. even if it was 23 it should go to 30 or so
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Old 02-26-2014, 01:23 PM   #29
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If I disconnected the vacuum on top of the regulator, it would bypass the vacuum system and should open the regulator?

If the fuel pump is faulty, it wouldn't fluctuate at all if it can't provide more pressure?
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Old 02-26-2014, 02:06 PM   #30
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possibly. not sure, i havent had any pumps go bad due to lack of pressure, most of the time here it goes out when its super cold

pretty good vid of what its supposed to look like
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