Replaced HP Fuel pump Aug 09. Reason: During purchase, seller said that he has had to replace it multiple times, his mechanic doesn't know why, and we couldn't start it during the test ride. But my mechanic said it was the HP Pump, becuase it was "starved for fuel" and not because the HP pump wasn't working, but it was "over working" and getting too hot too quickly (by hand touch--i was watching him) and that it must be a faulty pump. Once it was replace, things ran great so i thought nothing more of it. Ran fine rest of 09, and all of 10. Until last run of summer....There, it stalled out after 30 minutes of fun. Barely restarted, and had to limp/idle restart many times to make it the last mile home.
Told mechanic, he replaced HP Pump again after winter/storage as well as the in-line filter and said his check ride was great. He also said he "found the root cause of the overheating pumps"--that it was a poor wiring job (somewhere related to the pump) somthing he used ot see on automotive engines, and that my pump issues were cured for good...
I took boat, 3 weeks back, ran, but hesitant during any throttle change--never had this before, always ran clean, smooth and responsive. This run was about 15 minutes. No stalls during this ride, but it did take more time to start than normal. Had always started almost instantly--all summer last year. Able to park it on lift with no issues on this ride.
Since it was winter gas, i figured I'd run more of it out, on following weekend then get a 3/4 tank refill and it might run better. Planned on doing this on following weekend.
On 2nd weekend, before adding any sea foam or fresh gas. i took a quick test ride prior to getting the kids out for tubing, just to verify it would run. Started rough, slightly hesitant, but got up to speed and ran great, for about 300 yards. Then died. would barely restart then sputter, not back fire, but felt to me like fuel pump may just have died on the spot. Couldn't get it to restart and run more than 10 seconds, even with in-neutral revving. Needed a quick tow back.
Mechanic came buy next am, said again how he rode it a while with no problems when he test ran it. Checked that both fuel pumps cycled up on the first key turn. Said the pumps were fine because of that. He looked for a bit, verified spark, on one of the cylinders, then found that the coil wire connection was a little fouled up. Clean it out with wire brush, and replugged it in. We ran fine tied up, then took it for a 1 mile run, no hesitation at all, full power. I even told him "it was like last summer, no hesitation or anything".
Let it sit for 3 hours while i did chores--no end to those. Then got kids ready for tubing. Got the tuber ready, pulled him about 400 yards this time and complete stall out. Felt smooth and good until then. Took 5 minutes of fits/starts to get running at idle. Called mechanic, he was as upset as I. Came out next week while i was not there and replaced coil wire, but found it was still hesitant, looked at distributor (on my recommendation) and found it very corroded, so we've now replaced all 8 plug wires, coil wire, Distr. Cap, Rotor, and no better. Same. as before.
Also replaced the fuel-water separator. (didn't check for water here, but saw on other posts that i should have).
I was watching his son (long story, but mechanic is unavailable for 3 months, and son is trying to fill shoes) try to trouble shoot. Looked at TBI outputs into Carb and saw that stbd side was pushing only half of port side flow rate. Much different. I reminded him that this was exactly the symptom we had 2 years back when the fuel pump was bad--when the new pump was the solution. We were baffled now, had spark, wires, but off-balance fuel flow that wouldn't really go up with throttle. Then we noticed someone had knocked off the HP PUmp's power connector, thought we'd found nirvana. But, after we connected it again, flow rates and behavior were unchanged.
At this point we felt the pump was bad, becuase we metered the power supply in the connector and it was powering, but the evidence of fuel flow was no different. So they are going to be replacing the pump again tomorrow.
I'm not satisfied this will work, and started looking at this site. Now i'm very nervous bacause it seems like there's no consistent answer to similar problems as mine.
I'm thinking that the pump is bad, and they're warranty replacing the part, but i still don't like the completely uneven flow on port/stbd TBIs. And with all the posts of clogged lines i'm thinking the carb is full of junk. And that the pump is just tired of pushing through it.
I'm 2.5 hours away from the boat so i can't give any serial numbers until Friday. i'll post after he replaces the pump and let you know what happens, but i'd like some direction as to what you think could cause this. I've read about 1/4 of the posts and see similar, but not exactly the same issues.
Thanks in advance.
Told mechanic, he replaced HP Pump again after winter/storage as well as the in-line filter and said his check ride was great. He also said he "found the root cause of the overheating pumps"--that it was a poor wiring job (somewhere related to the pump) somthing he used ot see on automotive engines, and that my pump issues were cured for good...
I took boat, 3 weeks back, ran, but hesitant during any throttle change--never had this before, always ran clean, smooth and responsive. This run was about 15 minutes. No stalls during this ride, but it did take more time to start than normal. Had always started almost instantly--all summer last year. Able to park it on lift with no issues on this ride.
Since it was winter gas, i figured I'd run more of it out, on following weekend then get a 3/4 tank refill and it might run better. Planned on doing this on following weekend.
On 2nd weekend, before adding any sea foam or fresh gas. i took a quick test ride prior to getting the kids out for tubing, just to verify it would run. Started rough, slightly hesitant, but got up to speed and ran great, for about 300 yards. Then died. would barely restart then sputter, not back fire, but felt to me like fuel pump may just have died on the spot. Couldn't get it to restart and run more than 10 seconds, even with in-neutral revving. Needed a quick tow back.
Mechanic came buy next am, said again how he rode it a while with no problems when he test ran it. Checked that both fuel pumps cycled up on the first key turn. Said the pumps were fine because of that. He looked for a bit, verified spark, on one of the cylinders, then found that the coil wire connection was a little fouled up. Clean it out with wire brush, and replugged it in. We ran fine tied up, then took it for a 1 mile run, no hesitation at all, full power. I even told him "it was like last summer, no hesitation or anything".
Let it sit for 3 hours while i did chores--no end to those. Then got kids ready for tubing. Got the tuber ready, pulled him about 400 yards this time and complete stall out. Felt smooth and good until then. Took 5 minutes of fits/starts to get running at idle. Called mechanic, he was as upset as I. Came out next week while i was not there and replaced coil wire, but found it was still hesitant, looked at distributor (on my recommendation) and found it very corroded, so we've now replaced all 8 plug wires, coil wire, Distr. Cap, Rotor, and no better. Same. as before.
Also replaced the fuel-water separator. (didn't check for water here, but saw on other posts that i should have).
I was watching his son (long story, but mechanic is unavailable for 3 months, and son is trying to fill shoes) try to trouble shoot. Looked at TBI outputs into Carb and saw that stbd side was pushing only half of port side flow rate. Much different. I reminded him that this was exactly the symptom we had 2 years back when the fuel pump was bad--when the new pump was the solution. We were baffled now, had spark, wires, but off-balance fuel flow that wouldn't really go up with throttle. Then we noticed someone had knocked off the HP PUmp's power connector, thought we'd found nirvana. But, after we connected it again, flow rates and behavior were unchanged.
At this point we felt the pump was bad, becuase we metered the power supply in the connector and it was powering, but the evidence of fuel flow was no different. So they are going to be replacing the pump again tomorrow.
I'm not satisfied this will work, and started looking at this site. Now i'm very nervous bacause it seems like there's no consistent answer to similar problems as mine.
I'm thinking that the pump is bad, and they're warranty replacing the part, but i still don't like the completely uneven flow on port/stbd TBIs. And with all the posts of clogged lines i'm thinking the carb is full of junk. And that the pump is just tired of pushing through it.
I'm 2.5 hours away from the boat so i can't give any serial numbers until Friday. i'll post after he replaces the pump and let you know what happens, but i'd like some direction as to what you think could cause this. I've read about 1/4 of the posts and see similar, but not exactly the same issues.
Thanks in advance.