502 MPI Fuel pressure?
03-27-2014, 02:26 PM
#21
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i got this information from a merc tech that works on them all the time,he told me that i should have 43 lbs with the engine running,guess what,i had exactly 43 lbs.that ruled out fuel pressure being the issue.i will add that with the key on but engine not running the pressure will be lower.
Gen VI engine: So engine running (idle) it should be 43. With just the key turned to on (engine off) 34-38
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03-30-2014, 06:46 PM
#22
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i got this information from a merc tech that works on them all the time,he told me that i should have 43 lbs with the engine running,guess what,i had exactly 43 lbs.that ruled out fuel pressure being the issue.i will add that with the key on but engine not running the pressure will be lower.
On that 502 you mentioned in the thread about fuel pressure, where did you take your readings?
Curious because I'm thinking over the sender placement on my fuel system, which is directly after the pump. I don't like this location, but it was physically the best place I could put it without getting into a weird plumbing situation. Off the end of the fuel rail would be best, but I'm not sure it will clear the intake plenum.
On the other hand, we do really care about the exact pressure? If the dash gauge is a couple psi off the actual rail pressure, and you KNOW this, then I think it's a moot point.
All you really want to know is that you're maintaining regulator set point throughout the RPM/load range.
03-30-2014, 07:57 PM
#23
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Mike,
On that 502 you mentioned in the thread about fuel pressure, where did you take your readings?
Curious because I'm thinking over the sender placement on my fuel system, which is directly after the pump. I don't like this location, but it was physically the best place I could put it without getting into a weird plumbing situation. Off the end of the fuel rail would be best, but I'm not sure it will clear the intake plenum.
On the other hand, we do really care about the exact pressure? If the dash gauge is a couple psi off the actual rail pressure, and you KNOW this, then I think it's a moot point.
All you really want to know is that you're maintaining regulator set point throughout the RPM/load range.
On that 502 you mentioned in the thread about fuel pressure, where did you take your readings?
Curious because I'm thinking over the sender placement on my fuel system, which is directly after the pump. I don't like this location, but it was physically the best place I could put it without getting into a weird plumbing situation. Off the end of the fuel rail would be best, but I'm not sure it will clear the intake plenum.
On the other hand, we do really care about the exact pressure? If the dash gauge is a couple psi off the actual rail pressure, and you KNOW this, then I think it's a moot point.
All you really want to know is that you're maintaining regulator set point throughout the RPM/load range.
04-01-2014, 02:53 PM
#24
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Join Date: Sep 2013
Location: Port Deposit MD
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Roger that. Thanks boss. I was told by a perf mech to bump the pressure up a lil above factory this sound about right?
