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Old 10-26-2003, 10:42 AM   #1
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gremlins// fuel system

speaking of gremlins.
i have a fuel pump push rod knock. i took it out and it shows no signs of wear isnt warped. put it back with the new pump and click click we go untill the temp comes up then it goes away. i use 15w50 mobile one oil a friend advises i should use 10w30 and the click will go away.???? ever hear that one??
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Old 10-26-2003, 01:22 PM   #2
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Maybe the cam lobe is wearing. Seems like if it was oil it would get worse as the oil got thinner.

John
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Old 10-27-2003, 09:11 AM   #3
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giving some thought to removing the manual pump and just use the electric. im told the electric pump will keep the weeinie going with plenty of gas sure dont plan on replacing a cam shaft. id put that off as long as i could.
"question" what do you do with the return line to the tank???
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Old 10-27-2003, 09:30 AM   #4
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Return Line

Al:

There might be a fuel gas regulator already installed in the vicinity of the door on the underbelly of the beast (there is on mine, anyway, don't know if it was factory or not).

Utilizing that as overpressure protection to the carb, just plug the return line at the mechanical fuel pump.

If you don't have the pressure regulator at the door area, I would suggest installing a pressure regulator with overpressure (relief) protection, and install in the area of the present mechanical fuel pump, utilizing the existing return line for the relief.
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Old 10-27-2003, 10:02 AM   #5
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GM recomends a 10w30 and strongly advises not to use a oil with that large of operating range. In 88 the owners manual point blank stated that they will void the warranty if anthing thicker the 10w 30 is used. That was pre sythetic but still that hot operating viscosity is WAY above the 30 the engine was spec for.


The engines after the mid 70's run tighter bearing cleaences and they will actully break down oils that have too thick of viscocity and demish their lubricating properties.

Also what brand of oil filter are you using? Many filters have a poor drain back valve and that will cause some start up rattle. Thats the motor running with no oil and it causes bad wear. The oiling in the area of the pump push rod is about the last thing in the line to get oil to begin with. It's crittical to use a guality oil filter.

I'm using A/C and Bosch filters. Bosch is badge engineered...it's a A/C filter. Other good filters are Wix, Hastings, Amsoil, Mobile1.

bad.....FRAM, anything from the oil change places, store brand.
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Old 10-28-2003, 09:53 AM   #6
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i use only AC . ac filters are becoming hard tp get here . i had to drive to the other side of town to get one for my PU. I THINK I WILL TRY 10W30 NEXT OIL CHAQNGE . DONT THINK I WILL SEE ANY DIFFERENCE.
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