Like Tree0Likes

VST fuel pump

Reply
Old 11-02-2005, 11:59 PM
  #1
Charter Member
Charter Member
Thread Starter
Trade Score: (1)
 
Ted G's Avatar
 
Join Date: Jan 2001
Location: Edgerock Baby!!
My Boats: Marlago 35 FS, 18 Neptune CC
Posts: 7,661
VST fuel pump

Holy geez, I need some help here. Looks like the injection fuel pump has taken a crap on one of my 502's. VST screen is fairly clear and still only have 20 psi at the rail-goes up to 24 if I pull the vacuum line to the regulator (other engine is at 40-48).

Now it seems like most of the Mercruiser injection parts are just GM part numbers, so is there a GM replacement for this pump? Even at BAM the price on this puppy is like 420 bucks-little pricey for a 100 dollar pump.

Any other ideas would be appreciated.

Thanks
__________________
Chesapeake Bay Powerboat Association
www.cbpba.com
Ted G is offline  
Reply With Quote
Old 11-03-2005, 07:01 AM
  #2
Charter Member #71
Charter Member
 
DanB's Avatar
 
Join Date: Oct 2000
Location: Merritt Is., FL
My Boats: 1993 Cig
Posts: 919
Default Re: VST fuel pump

$420 is a good price for a merc.....I paid $495 a few months ago. Its the "merc tax" Hope you find a subsitute.
DanB is offline  
Reply With Quote
Old 11-03-2005, 07:52 AM
  #3
Offshoreonly Advertiser
Offshoreonly Advertiser
 
Mbam's Avatar
 
Join Date: Mar 2001
Location: Pompano Beach FL, USA
My Boats: 1972 Cigarette 36 race
Posts: 2,048
Default Re: VST fuel pump

Ted, just for grins try swapping the regulators. That pump normally works or dies. Is the VST tank full when you take the cover off?

Yep, Merc is very proud of their stuff !!
__________________
Marc

www.mercruiserparts.com
www.go-fast.com
www.bammarine.com
www.cyborgtransmissions.com
It's alive -www.BoatStuffExpress.com - additional 10% discount for OSO members
Mbam is offline  
Reply With Quote
Old 11-03-2005, 08:05 AM
  #4
Registered
 
el indio's Avatar
 
Join Date: Feb 2004
Posts: 2,855
Default Re: VST fuel pump

good morning marc........................mark......
Attached Thumbnails
VST fuel pump-img_0030.jpg  
el indio is offline  
Reply With Quote
Old 11-03-2005, 08:44 AM
  #5
Registered
 
GOODT's Avatar
 
Join Date: Apr 2005
Location: KENT ISLAND, MARYLAND
Posts: 2,675
Default Re: VST fuel pump

mbam is right check the regulator first, no I dont think that there is a cross over for that pump..it may be a GM pump but I belive that merc modfies it.also check the float and needle and seat in there merc does make a rebuild kit for those and as long as your there you might as well
GOODT is offline  
Reply With Quote
Old 11-03-2005, 09:04 AM
  #6
Charter Member
Charter Member
Thread Starter
Trade Score: (1)
 
Ted G's Avatar
 
Join Date: Jan 2001
Location: Edgerock Baby!!
My Boats: Marlago 35 FS, 18 Neptune CC
Posts: 7,661
Default Re: VST fuel pump

Thanks for the advice guys. I did have a full tank when I opened it and the low pressure was at idle so there was very little fuel consumption anyhow. I guess I'll do a regulator swap and then send you some more money Marc one way or the other, since the o-ring decided to grow as soon as I removed the cover
__________________
Chesapeake Bay Powerboat Association
www.cbpba.com
Ted G is offline  
Reply With Quote
Old 11-03-2005, 12:03 PM
  #7
Registered
 
scottc's Avatar
 
Join Date: Mar 2001
Location: edgewater,md.usa
My Boats: 1990 Silverton 34 Express
Posts: 841
Default Re: VST fuel pump

One way to test the regulator and pump is to momentarliy clamp off the return line and see if the pressure goes way up. That will tell if the fuel pump is able to make full pressure and the regulator is not stuck open. Not all fi systems have a return line. This only works on a return system.
scottc is offline  
Reply With Quote
Old 11-03-2005, 01:23 PM
  #8
Michigan Mad Man
Racer
Trade Score: (1)
 
Join Date: Feb 2003
Location: Ruby, Mi
My Boats: Crockett Marine Engines - OPA Class 6 Champions 2007
Posts: 1,172
Default Re: VST fuel pump

Quote:
Originally Posted by insptech
Thanks for the advice guys. I did have a full tank when I opened it and the low pressure was at idle so there was very little fuel consumption anyhow. I guess I'll do a regulator swap and then send you some more money Marc one way or the other, since the o-ring decided to grow as soon as I removed the cover
Ted I have a pile of those VST pumps if you want to try one I take them off the early engines and put a bigger pump and cooler on. Tyler
TylerCrockett is offline  
Reply With Quote
Old 11-03-2005, 07:57 PM
  #9
Charter Member
Charter Member
Thread Starter
Trade Score: (1)
 
Ted G's Avatar
 
Join Date: Jan 2001
Location: Edgerock Baby!!
My Boats: Marlago 35 FS, 18 Neptune CC
Posts: 7,661
Default Re: VST fuel pump

Scott, the only exposed hose on the Merc system is a reinforced, crimped hose similar to p/s hose on a car. As you probably know it isn't a good idea to crimp it, the rest of the run is in the fuel rail itself.

Tyler, thanks for the offer, if it looks like a pump I will be in touch and see if I can lessen your pile a little I really appreciate it.
__________________
Chesapeake Bay Powerboat Association
www.cbpba.com
Ted G is offline  
Reply With Quote
Old 11-05-2005, 09:22 AM
  #10
Registered
 
Bosco's Avatar
 
Join Date: Nov 2000
Location: Crystal River, FL
My Boats: Avanti 1986
Posts: 220
Default Re: VST fuel pump

you can't be far off the mark. Recently while servicing a similar system on an outboard I noticed the Mitsibushi emblem on top of the pump. They supply the pump to Mikuni who intern sells the entire intake assembly to Suzuki, Yamaha, etc. Went to the car dealer and bought the $300. pump for a $125.00
Bosco is offline  
Reply With Quote
Reply

Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
D Harry
General Q & A
8
04-14-2008 10:55 AM
jerosejr
General Q & A
1
04-04-2005 07:18 AM
pachangalpina
General Q & A
1
07-06-2004 10:58 AM
H2Xmark
General Q & A
7
08-04-2003 11:48 AM
maverick1
General Q & A
1
07-04-2003 11:13 AM



Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On



All times are GMT -5. The time now is 11:41 AM.


Copyright 2011 OffShoreOnly. All rights reserved.