fuel pump not working
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Read the manual to see if your question is answered there before posting. If you have questions about MS1/Extra or MS2/Extra or other non-B&G code configuration or tuning, please post them at http://www.msextra.com The full forum rules are here: Forum Rules, be sure to read them all regularly.
Read the manual to see if your question is answered there before posting. If you have questions about MS1/Extra or MS2/Extra or other non-B&G code configuration or tuning, please post them at http://www.msextra.com The full forum rules are here: Forum Rules, be sure to read them all regularly.
fuel pump not working
I'm running a msII v.3. My fuel pump doesn't turn on. the LED on the ms lights up, but the one on the stim doesn't. how do I trouble shoot the circuit?
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Bernard Fife
- Super Squirter
- Posts: 1009
- Joined: Mon Feb 16, 2004 3:15 pm
feldz82,
There are only 5 components on the fuel pump circuit for the V3 boards:
- R16 (the 1K Ohm base resistor for Q2),
- Q19 (the 2N3904 transistor),
- Q2 (the ZTX450 transistor),
- R40 (the 1 Ohm, 1/2W resistor),
- D4 (22V Zener 'flyback' diode).
Any of these could cause a problem, so check them all, but most commonly the problem is a solder bridge between the very closely spaced leads of the transistors. Use a solder wick (a fine braid of woven copper) to remove any excess solder. Also check that D4 is in the right way around, and that the resitors are well soldereed but not bridge to any adjacent components.
Lance.
There are only 5 components on the fuel pump circuit for the V3 boards:
- R16 (the 1K Ohm base resistor for Q2),
- Q19 (the 2N3904 transistor),
- Q2 (the ZTX450 transistor),
- R40 (the 1 Ohm, 1/2W resistor),
- D4 (22V Zener 'flyback' diode).
Any of these could cause a problem, so check them all, but most commonly the problem is a solder bridge between the very closely spaced leads of the transistors. Use a solder wick (a fine braid of woven copper) to remove any excess solder. Also check that D4 is in the right way around, and that the resitors are well soldereed but not bridge to any adjacent components.
Lance.