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FJR Motorcycle Forums
Technical & Mechanical Problems
Fuel Pressure Reg
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<blockquote data-quote="3dogs" data-source="post: 939373" data-attributes="member: 424"><p>The 36 psi is only half the story. Even if fuel pressure is at 36 psi, the volume of fuel delivered from the pump may not be enough to provide full engine power. I worked for Snap On's tech line and when a vehicle had a symptom of "lacks power at full throttle" both fuel pressure and volume were checked. A pump that makes full pressure, but only produces a trickle of fuel, either is not getting enough current (voltage drop issue), is tired/worn out or the fuel filter is starting to plug up. Since genI doesn't have fuel filter it could be the pump (and not the regulator). Easy to check--get the pump to run by jumping the F/P relay, connect a fuel hose to the pump and put the other end into a container. The pump should fill a pint container in less that 15 seconds (or produce a fairly high volume of fuel out of the hose).</p></blockquote><p></p>
[QUOTE="3dogs, post: 939373, member: 424"] The 36 psi is only half the story. Even if fuel pressure is at 36 psi, the volume of fuel delivered from the pump may not be enough to provide full engine power. I worked for Snap On's tech line and when a vehicle had a symptom of "lacks power at full throttle" both fuel pressure and volume were checked. A pump that makes full pressure, but only produces a trickle of fuel, either is not getting enough current (voltage drop issue), is tired/worn out or the fuel filter is starting to plug up. Since genI doesn't have fuel filter it could be the pump (and not the regulator). Easy to check--get the pump to run by jumping the F/P relay, connect a fuel hose to the pump and put the other end into a container. The pump should fill a pint container in less that 15 seconds (or produce a fairly high volume of fuel out of the hose). [/QUOTE]
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FJR Motorcycle Forums
Technical & Mechanical Problems
Fuel Pressure Reg
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