• If this is your first visit to the iboats.com Boating Forums, be sure to check out the FAQ. To post a question or comment, begin by signing up. To start viewing messages, select the forum that you want to visit from the selection below.

Announcement

Announcement Module
Collapse

Help Tip: If you have a question that has not been answered to your satisfaction in the archives, it is always best to start a new thread of your own. By starting your own thread, you will receive the maximum number of views by forum members.

Below are some additional forum policies in hopes of all iboats members will follow, Thank you.

1. Please do not reply to old threads or hijack existing threads. Old threads of a technical nature are like a library book, Please do not write in them.

2. Old threads should be considered archives and used for reference only. Please do not reply to them.

3. Do not take over someone elseís thread (aka hijack) with your own question, even if it is similar. If you have a question that has not been covered to your satisfaction in the archives, it is always best to start a new thread of your own.

4. If you have a question for the original poster (OP) and the thread is over 30 days old, send the OP a PM, he may not even visit the forums any longer, or may not notice your question in the old thread.

5. By starting your own thread, you will receive the maximum number of views by forum helpers that may not even notice your question when itís posted at the end of someone elseís thread. And those answers will be specific to your particular issue.

6. Please do not post to threads that have been inactive for more than 3 months unless you are the original poster. We have very active forums and any thread that remains inactive for that long should be considered "dead". It is especially confusing when there is an entirely new question posted to an old thread.

7. Posting at the end of any thread is considered to be hijacking the original posters thread which in turn subjects the thread to be closed if it continues to happen thus not making it fair to the original poster in the future had for some reason he/she needed to return for additional information or provide an update of the problem solved which is always welcomed within a reasonable amount of time frame.

8. Please note that you should see a red banner pop up near the bottom of each inactive thread asking you not to reply to old threads. The Red banner will read: Please note this thread has been inactive for 90 days. For the best results, please start a new thread.

Thank you all in advance for doing your part in helping iboats run a smooth ship.

Additional forum rules linked below.
http://forums.iboats.com/forum-rules-guidelines-405/
See more
See less

Evinrude 90 hp two stroke - fuel pump testing - how to?

Page Title Module
Move Remove Collapse
X
Conversation Detail Module
Collapse
  • Filter
  • Time
  • Show
Clear All
new posts


  • Evinrude 90 hp two stroke - fuel pump testing - how to?

    I was wondering how do I test the pressure or flow rate of my fuel pump on a 1981 Evinrude 90hp two stroke engine. I don't have any gauges or flow rate meters. The motor is hard starting some times


  • #2
    Re: Evinrude 90 hp two stroke - fuel pump testing - how to?

    motor starts off the priming bulb so if the bulb pumps until it becomes firm then its proberly not the pump unless its flooding with gas. the pump failing will normally show up when engine is under power. the carbs will starve for gas and the simple check is to get someone to pump the primer if the motor picks up then its proberly the pump. pressure can be tested but unless you have a base line for what its meant to read then it proberly wont help. (does your fuel bypass valve click when you press the key in?)

    Comment



    • #3
      Re: Evinrude 90 hp two stroke - fuel pump testing - how to?

      Easy to test. Disable ignition so motor can't start, disconnect fuel pump outlet hose and direct the outflow to a pail. Crank motor over with starter ... you should get strong fuel pulses. Feeble pulses suggest a bad fuel pump.
      Jim

      ===============================
      I don't respond to Private Messages PM's that are motor questions.

      For basic information on a wide range of topics, see Top Secret File
      Link: http://forums.iboats.com/showthread.php?t=299680

      OEM shop manual: outboardbooks.com or Ebay

      Comment



      • #4
        Re: Evinrude 90 hp two stroke - fuel pump testing - how to?

        Originally posted by wilde1j View Post
        Easy to test. Disable ignition so motor can't start, disconnect fuel pump outlet hose and direct the outflow to a pail. Crank motor over with starter ... you should get strong fuel pulses. Feeble pulses suggest a bad fuel pump.
        This basically what I always did but this is with the VRO pump not sure if anything was different. Motor starts, runs okay but sometime when its hot and sits for 20 - 30 minutes it very hard to start again. Not sure if its flooded or starving for gas or if its even gas related - almost everything else has been replaced or rebuilt

        Comment



        • #5
          Re: Evinrude 90 hp two stroke - fuel pump testing - how to?

          Hi,
          I have the 50HP Johnson and i was having the same issues as you have mentioned, when started from cold it would start first crank and the same if restarted with in 5-10 mins of switching off, However if it was left to sit for anything more than about 30 mins to a few hours it would be a real pain to restart it.
          Turned out to be the mechanic who serviced it before i bought it had put the wrong plugs in it,So i swapped them out for the right ones now when i start it she fires up first crank all the time now does not matter how long it has been off for.
          So being that is a simple thing i'd check that first.
          Have a look in Click image for larger version

Name:	fd1a1054f5191848e6273ad37d409392.pdf
Views:	1
Size:	17.8 KB
ID:	128657 and check you have the right ones they should be Champion branded
          If they are fine then as mentioned previously take the fuel line off and run it into a bucket and check for strong pulses of fuel when cranking.
          Good luck

          Comment

          Working...
          X