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SVTPerformance's Chain of Restaurants
Tuning À la carte
Fuel pressure gauge won't read over 40 psi
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<blockquote data-quote="bergs" data-source="post: 14220502" data-attributes="member: 77705"><p>so I installed that new walbro 290 lph pump. I took it out for an easy shakedown to make sure the install went ok. No leaks so I data logged a little low boost 1/2 to 3/4 hits in 2nd gear just up to like 4000 rpms. The fuel pressure gauge still reads like 36-40 psi. The datalog shows that the fuel pressure is trying to stay at 40 but the duty cycle goes up in a steady up hill line. the fuel pressure will flutter sometimes up to 50, sometimes below 40 but it kinda averages out to about 40 while the duty cycle is a constant increase. </p><p></p><p>I'm starting to wonder if the thing is supposed to keep 40 psi at the rail at all times even under boost. Funny thing is when at idle the fp gauge reads 20 psi and the handheld reads 40 psi like it should with 20 in/lb of vacuum. Anyone want to look at the data log? I'm going to do a more aggressive log soon and probably take it back to my tuner for a re-tune because of the new pump and to verify the a/f ratio.</p><p></p><p>I'm also thinking of doing the wire upgrade and BAP at this point</p></blockquote><p></p>
[QUOTE="bergs, post: 14220502, member: 77705"] so I installed that new walbro 290 lph pump. I took it out for an easy shakedown to make sure the install went ok. No leaks so I data logged a little low boost 1/2 to 3/4 hits in 2nd gear just up to like 4000 rpms. The fuel pressure gauge still reads like 36-40 psi. The datalog shows that the fuel pressure is trying to stay at 40 but the duty cycle goes up in a steady up hill line. the fuel pressure will flutter sometimes up to 50, sometimes below 40 but it kinda averages out to about 40 while the duty cycle is a constant increase. I'm starting to wonder if the thing is supposed to keep 40 psi at the rail at all times even under boost. Funny thing is when at idle the fp gauge reads 20 psi and the handheld reads 40 psi like it should with 20 in/lb of vacuum. Anyone want to look at the data log? I'm going to do a more aggressive log soon and probably take it back to my tuner for a re-tune because of the new pump and to verify the a/f ratio. I'm also thinking of doing the wire upgrade and BAP at this point [/QUOTE]
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SVTPerformance's Chain of Restaurants
Tuning À la carte
Fuel pressure gauge won't read over 40 psi
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