Offshoreonly.com
Page 3 of 6
1
2
3
4
5
Last »
Show 40 post(s) from this thread on one page

Offshoreonly.com (https://www.offshoreonly.com/forums/)
-   Do It Yourself, Boating on a Budget (https://www.offshoreonly.com/forums/do-yourself-boating-budget-249/)
-   -   502 mag mpi cutting out (https://www.offshoreonly.com/forums/do-yourself-boating-budget/380298-502-mag-mpi-cutting-out.html)

Griff 08-31-2023 12:19 AM
Mine is still having the same issue and with my regular props on that spin to 5000rpms, its happening at 4000-4100rpm and pulls back 200ish rpms.

BTW, I FB messaged with BUP last night and he is pretty sure its my EST module and/or pick up coil going out.

Drewm3i 08-31-2023 02:25 AM
Originally Posted by Bstocky (Post 4878312)
Vent should be clear, I always put my finger by it when fueling and check for air pushing out.
What about the anti-siphon valve?

Bstocky 08-31-2023 06:34 AM
Originally Posted by Griff (Post 4878357)
Mine is still having the same issue and with my regular props on that spin to 5000rpms, its happening at 4000-4100rpm and pulls back 200ish rpms.

BTW, I FB messaged with BUP last night and he is pretty sure its my EST module and/or pick up coil going out.

I did buy a new cap, rotor and ignition module for mine to be safe, gojng to run the boat this weekend.

I hooked up a scanner for codes, nothing. I also ran a fuel pump test with the scanner with a fuel pressure gauge on the rail, 48-49 psi while the pump was cycling, held about 44-45 when it was turned off.

Bstocky 08-31-2023 06:34 AM
Originally Posted by Drewm3i (Post 4878358)
What about the anti-siphon valve?
unsure on that, or how you would go about testing/checking that

AllDodge 08-31-2023 06:43 AM
Originally Posted by Bstocky (Post 4878363)
I did buy a new cap, rotor and ignition module for mine to be safe, gojng to run the boat this weekend.

I hooked up a scanner for codes, nothing. I also ran a fuel pump test with the scanner with a fuel pressure gauge on the rail, 48-49 psi while the pump was cycling, held about 44-45 when it was turned off.
If your gauge is accurate
Pressure is to high, check/clean the Regulator screen

If it's clean its the Reg

Bstocky 08-31-2023 06:49 AM
Originally Posted by AllDodge (Post 4878365)
If your gauge is accurate
Pressure is to high, check/clean the Regulator screen

If it's clean its the Reg
there is a adjustable Hardin pressure reg on mine. Was done with the cam, exhaust, and tuned ecu

AllDodge 08-31-2023 06:53 AM
Originally Posted by Bstocky (Post 4878366)
there is a adjustable Hardin pressure reg on mine. Was done with the cam, exhaust, and tuned ecu
OK, I'll retract my statement

Bstocky 08-31-2023 06:56 AM
Originally Posted by AllDodge (Post 4878368)
OK, I'll retract my statement
no worries, I appreciate your input!

Griff 08-31-2023 12:26 PM
If pressure holds, then anti siphon valve is not an issue

Drewm3i 08-31-2023 04:20 PM
Originally Posted by Bstocky (Post 4878364)
unsure on that, or how you would go about testing/checking that
It is likely culprit for bogging/fuel starvation. Seen it a bunch. It is at your tank hose barb that leads to the fuel/water separator on the engine.

Looks like this:
https://cimg5.ibsrv.net/gimg/www.off...4c1dd51364.jpg


All times are GMT -5. The time now is 02:21 PM.
Page 3 of 6
1
2
3
4
5
Last »
Show 40 post(s) from this thread on one page


Copyright © 2026 MH Sub I, LLC dba Internet Brands. All rights reserved. Use of this site indicates your consent to the Terms of Use.