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Fuel flow slows when engine is warm 8 years 7 months ago #9079

  • KZQ
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rdbhere2 wrote: Yes Im still using the solenoid.I thought about taking it off. I was leaning toward a pulse fuel pump also.

If you read through the FAQ section you'll find a lot of bad theory about 13s and vaporlocks. In my opinion the problems with vapor locking are always associated with a roller coaster arrangement of the fuel lines and that's primarily a result of the location of the fuel solenoid. Additionally, all the discussion about pulse fuel pumps is wasted energy expended to over come poor fuel line routing.
I cleaned up my 81 KZ1300 by adding a Pingle petcock and eliminating the solenoid. Have never had any fuel issues since.
Bill
1947 Indian Chief, 1968 BSA Shooting Star, 1970 BSA 650 Lightning, 1974 Kawasaki W3, 1976 KZ900 A4, 1979 KZ750 B4, 1979 KZ750 B4 Trike, 1980 KZ550, 1981 KZ1300, 1982 KZ1100 Spectre, 1985 Kawasaki ZN1300, 1987 Yamaha Trail Way, 2000 Honda Valkyrie Tourer, 1981 GL 1100, 2009 Yamaha RoadLiner S
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Fuel flow slows when engine is warm 8 years 7 months ago #9087

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1. Warm up the engine until the fuel flow slows.

2. Disconnect fuel line at petcock. If flow from petcock insufficient, problem is petcock or fuel tank.

3. If flow from petcock is sufficient, reconnect fuel line. Disconnect line at outlet of fuel solenoid. If flow is insufficient = bad fuel solenoid.
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Fuel flow slows when engine is warm 8 years 7 months ago #9088

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Your logic is impeccable Globemaster.
Z1300 UK
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Fuel flow slows when engine is warm 8 years 7 months ago #9089

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Let's try this pump for a day or two.
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Fuel flow slows when engine is warm 8 years 7 months ago #9091

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If the restriction is at the fuel tank, petcock, or fuel valve solenoid (assuming it is still in place)the fuel pump will gain you nothing.

Careful with the fuel pump. If its pressure is more than about 3 psi, it will overwhelm the ability of the floats to close the float valves.

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Fuel flow slows when engine is warm 8 years 7 months ago #9096

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1.7 to 2.3 psi fuel pump. I'll take the bike on the highway tomorrow, that will be the real test. Lot of good info thanks guys.

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