Low fuel pressure

[N941WR]

I second Vlad's comments.

Here were my symptoms. I would pass 1000' AGL and turn off the pump while still climbing at full throttle. The SkyView would complain about low fuel pressure and when I would look at it, it would be reading 0 to 1 PSI. Turn on the electric boost pump and it would come right up.

Here's the thing, I could continue to climb at full power with the boost pump off and the PSI reading zero. I'm talking about a Vx climb under full power with my O-360 and the fuel flow reading over 15 GPH and he engine never stumbled.

It became pretty obvious that the issue wasn't the fuel pump.

The first thing I did was to remove the wires at the forest of tabs and at the sensor and sand them down with some 1500 grit sandpaper. This did not solve the issue.

Three days ago I replaced the fuel pressure sender and now have 1.3 hours of hard climbs without the boost pump on. So far, so good. No more low fuel pressure warnings.

At the same time this was going on, I also was getting an occasional high oil pressure warning when I would throttle back. Needless to say, that sender was also changed at the same time.

I was able to locate both VDO senders on Amazon for a few bucks cheaper than any of the normal aviation sites.

[Funguy]

I had the exact same symptoms in a very similar vintage engine. I replaced the fuel pump and all is well again. Thankfully, they are a number of threads on how to do this properly. The lacing to hold up the pin method worked for me. Thanks to all that previously posted.

Cheers, Sean

[brayski98]

Well I went ahead and replaced the fuel pump today. It?s not a fun job as you can imagine but I will survive. Pulled it out and did a test run and low and behold, I have fuel pressure once again. A little lower than before but it read 4 or 5 psi. Much better than reading zero. So I think it?s all fixed. Just finished safety wiring it. (Yet another pain). I couldn?t do too many of these without a blood transfusion. I will cowl it?s up and hope to fly in the next couple of days.

Thanks everyone for your help. Hopefully it will last another 25 years.

[abwaldal@gmail.com]

I Can't believe this thread is here now as the last three days my RV-6A 0-360 550 hour 2 mag cs has been acting up
Take off climb out and climb to 8,000 feet normal. No boost on at all. Get to 8,000 feet or so climbing full throttle 2200 rpm leaned as much as possible 100 knots steep deck angle. engine starts to stumble and would quit if I let it. Now if I put on boost pump engine regains composure after a second or two. repeatable situation. most times. nose down anytime and it runs great all the way back home. Maybe it's homesick.
But level off engine smooth, pitch up keep climbing 12,500 no problem.
Thought it to be engine pump, still sorta stumped. Gonna pull cowl for pump inspection. Crazy some of us have these problems at same time. Maybe it's got a Corona virus. Or maybe the Costco premium has the virus.
Art