Jump to content

Welcome to TheMalibuCrew!

As a guest, you are welcome to poke around and view the majority of the content that we have to offer, but in order to post, search, contact members, and get full use out of the website you will need to Register for an Account. It's free and it's easy, so don't hesitate to join the TheMalibuCrew Family today!

fuel issues, 350 5.7 Mag Tourney ski engine TBI


Recommended Posts

ok, im a first timer to the forum as well...  95 malibu echelon with the 350 Mag Tourney ski engine.

MIE:1995, HP: 350 TBI, Model: 357K111HS

I acquired the boat from a friend at a "cannot turn down" offer :) and i am having trouble cranking and starting. it had been not used for a few years. I was told it needed a high pressure fuel pump and thats it. Found a few OEMs online that were $700-800 each. I was told thru other resources (bakesonline) that the after market pumps would work fine. So i purchased one from summit. installed, it fixed nothing. I then replaced the fuel regulator and with new diaphragm that was NOT the same as what was on it. Old one looked like it was spot welded to cover up "adjustment hole". (im no mechanic so sorry about the lingo). Noticed the injectors were very rusted and spray pattern was nothing but drips, so at that point i took it to a boat mechanic.

He basically took me for a ride and told me every part i installed was crap, then ordered all new parts (which was from summit racing BTW and sure enough... he failed to fix it also. He did say that when he tested/crimped the return fuel rail going back to the high pressure pump, it would run better?

Then i discovered that the fuel line going into the inline fuel filter before the mechanical pump was not connected properly with c clamp. I fixed it and it finally started better and stayed running for a minute or so but then died. Im at a lose as to what to do next!.

Note: no clog in vent hole at tank, fuel tank drained and cleaned, mechanical pump is good, fuel separator is good. It will start fine with starter fluid but wont stay cranked.

Questions i have for the group that relates to this thread:
Should i replace all fuel lines and fuel rails going to carb?
Could the fuel regulator diaphragm not be producing the correct amount of pressure? Its from autozone and could be standard setting version( fits 350 chevy)
Could i have the wrong fuel injectors installed by this mechanic? I read online ...https://skiboatpartsonline.com/TBI-Marine-Fuel-Injector-MEF-0070 ... Marine calibrated injectors designed for 29 PSI fuel pressure for the 5.7 Chevy engines. DO NOT use automotive injectors designed for 7 psi fuel pressure in a Marine engine.

ANY help would be appreciated. My apologies for long post but lots to explain. Im almost about to pull the plug on all this and order the Holley Sniper EFI set up and be done... i just dont have another 1500 to throw out right now...

https://drive.google.com/file/d/1AXo_MctASJLUiNCL3tn_yVQ2oz8-kc33/view?usp=sharing

https://drive.google.com/file/d/1cNLyzkNMWeaXSRwPQ4zmqPhBdTKhqiG5/view?usp=sharing

https://drive.google.com/file/d/1yWW7hDEuoUwMd26mBvkK-7ENT5cfVsGG/view?usp=sharing

 

Link to post
15 minutes ago, mikeLF said:

ok, im a first timer to the forum as well...  95 malibu echelon with the 350 Mag Tourney ski engine.

MIE:1995, HP: 350 TBI, Model: 357K111HS

I acquired the boat from a friend at a "cannot turn down" offer :) and i am having trouble cranking and starting. it had been not used for a few years. I was told it needed a high pressure fuel pump and thats it. Found a few OEMs online that were $700-800 each. I was told thru other resources (bakesonline) that the after market pumps would work fine. So i purchased one from summit. installed, it fixed nothing. I then replaced the fuel regulator and with new diaphragm that was NOT the same as what was on it. Old one looked like it was spot welded to cover up "adjustment hole". (im no mechanic so sorry about the lingo). Noticed the injectors were very rusted and spray pattern was nothing but drips, so at that point i took it to a boat mechanic.

He basically took me for a ride and told me every part i installed was crap, then ordered all new parts (which was from summit racing BTW and sure enough... he failed to fix it also. He did say that when he tested/crimped the return fuel rail going back to the high pressure pump, it would run better?

Then i discovered that the fuel line going into the inline fuel filter before the mechanical pump was not connected properly with c clamp. I fixed it and it finally started better and stayed running for a minute or so but then died. Im at a lose as to what to do next!.

Note: no clog in vent hole at tank, fuel tank drained and cleaned, mechanical pump is good, fuel separator is good. It will start fine with starter fluid but wont stay cranked.

Questions i have for the group that relates to this thread:
Should i replace all fuel lines and fuel rails going to carb?
Could the fuel regulator diaphragm not be producing the correct amount of pressure? Its from autozone and could be standard setting version( fits 350 chevy)
Could i have the wrong fuel injectors installed by this mechanic? I read online ...https://skiboatpartsonline.com/TBI-Marine-Fuel-Injector-MEF-0070 ... Marine calibrated injectors designed for 29 PSI fuel pressure for the 5.7 Chevy engines. DO NOT use automotive injectors designed for 7 psi fuel pressure in a Marine engine.

ANY help would be appreciated. My apologies for long post but lots to explain. Im almost about to pull the plug on all this and order the Holley Sniper EFI set up and be done... i just dont have another 1500 to throw out right now...

https://drive.google.com/file/d/1AXo_MctASJLUiNCL3tn_yVQ2oz8-kc33/view?usp=sharing

https://drive.google.com/file/d/1cNLyzkNMWeaXSRwPQ4zmqPhBdTKhqiG5/view?usp=sharing

https://drive.google.com/file/d/1yWW7hDEuoUwMd26mBvkK-7ENT5cfVsGG/view?usp=sharing

 

from unrelated thread: justgary

An injected engine does not have a carburetor, it has a throttle body. 

You mention injectors, which leads me to believe that you have a multi-port injected (MPI) rather than throttle body injected (TBI) engine.  Your part is for a TBI engine.  Which do you have?

Depending on your system, you may need a 3 Bar (44 PSI) regulator.

This thread was specifically about a carbureted engine, so it might be best to start your own thread.  A photo would help us identify what you have.

Link to post

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.

Guest
Reply to this topic...

×   Pasted as rich text.   Restore formatting

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

×
×
  • Create New...