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| mechanical fuel pump probs, helllllppppp!!!! https://ausmini.com/forums/viewtopic.php?f=2&t=474 |
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| Author: | lobby69 [ Sat May 01, 2004 5:10 pm ] |
| Post subject: | mechanical fuel pump probs, helllllppppp!!!! |
hey all i own a 71 k, just the standard 1100!!! im having troube with the mechanical fuel pump!!! can anyone let me know if i reall need the mechanical fuel pump, if i can just bypass it or not??? im using an electrical fuel pump aswell, so if i can just bypass it????? cheers, p.s my mini manual doesnt say, so i thought id come to the professionals!!!! heheh cheers LOBBY!  
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| Author: | excops [ Sat May 01, 2004 6:21 pm ] |
| Post subject: | |
You only need one, the electrical pump has a higher flow. If you are sure the mechanical pump id the problem pull it of and put a plate in it's place. how do you know that it is the mechanical pump causing probs? Usually they usually cause less problems than the electrical type. From factory your car would've just had the mechanical pump fitted ! |
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| Author: | poeee [ Sat May 01, 2004 7:02 pm ] |
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Yep, i'm thinking the same thing, excops. If the mechanical fuel pump isn't pumping, and it has a pressure behind it from an electric pump, it would still flow, wouldn't it? |
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| Author: | ronniemac [ Sat May 01, 2004 8:07 pm ] |
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I just went down to my shed and tried an SU and a Goss mechanical fuel pump by putting my gob on the inlet and blowing. Air passed through both with only a small amount of restriction due to the springs on the valves. When i blew the other way nothing went through, as it should. So if your electric fuel pump is in good condition there is no reason why fuel shouldn't get to the carby unless there is a blockage. |
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| Author: | Anto [ Sat May 01, 2004 8:39 pm ] |
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If you are running the electric fuel pump then you don't want the hoses running through the mechanical pump, at worst it doesn't achieve anything anyway. Preferably remove the old mechanical pump, but it's fine to leave the old one in, I did for a few years. Especially because if the electric pump fails leaving you stranded, you can plug the mechanical pump in instead. Depending on the type of electric pump, they run at a higher PSI (mine is 6psi). Surely if you push this constant PSI through the mechanical pump, which runs at a variable speed off the cam, it can't be good for either of the pumps?? Anto. |
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| Author: | drmini in aust [ Sat May 01, 2004 8:43 pm ] |
| Post subject: | |
I would take the mech one out and put a plate on. Reason- if you get a hole in the diaphragm (common when they get old) you can pump fuel into the engine sump. This thins out the oil and increases fire risk... 
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| Author: | lobby69 [ Sun May 02, 2004 7:51 am ] |
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WOW, chance of fire! NO WAY, this pump is coming out! thanks for that info! lobstar! |
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