How and where do i check the fuel pressure on my AQ170?

[boatingmark]

Hi all
Anyone know how and where do i check the fuel pressure on my AQ170?

Thanks

 

[Scott Danforth]

you make a test piece of hose with a T to go between the fuel pump and carburetor.

 

[boatingmark]

thank you scott, do i need something like this?

http://www.ebay.co.uk/itm/Fuel-Pres...445716?hash=item33b38934d4:g:qoQAAOSwcF9UW2jg

Any idea where i can find the right pressure setting? Im guessing if low the fuel pump needs overhauling?

 

[Bondo]

Ayuh,..... A zero to 10 psi would be better than a 100 psi gauge, as yer lookin' for 4 psi to 6 psi at the carb inlet,....

 

[boatingmark]

Thank you bondo!

 

[boatingmark]

It seems i do have fueling issues, im not getting fuel coming through all the J tubes when i pump the throttle only the last one (third carb).

I had a similar problems last year when it hadnt been started for a while, i kept pumping and cranking and it eventually started, this time it seems worse! Sounds like its just cranking and thats it.

I cant check the fuel pressure until its running, right? Could this be a fuel pump or dirty carb issue?

Ive owned the boat 18 months and im unsure when the carbs where last overhauled so would it be wise to service them?

Ive just replaced the points and have a dwell meter ready to set them more accurately, the distributor cap and rotor arm look all ok, i have a spark but will double check this again on every plug once ive fully charged the battery again. Ive ordered a condenser and also a gunson colourtune kit to adjust the mixture once running, as im aware it was running far to rich anyway.

Any help would be mostly appreciated, its the beginning of the season here in the UK with Easter this weekend, was hoping to use the boat for the first time this year with the family!

I do hope i can get this sorted!

 

[boatingmark]

Ive now got a gauge kit to put in-line and test the fuel pressure (once i can actually get the engine running!)

 

[jerryjerry05]

You can test the fuel pressure without running the motor.
One thing that some do is add an outboard squeeze ball to the system.
It draws the fuel up into the system without over working the pump.
This is usually used to get the motor running and removed when any problems are solved.
You might have a stuck anti-siphon valve if the fuel pump won't draw fuel?
Or the pickup tube is clogged???

 

[boatingmark]

Thanks for all your replies.

After testing on cranking only i have the fuel gauge in-line between fuel pump and first carb reading between 3.5 - 4 psi

Seems the low end of the tolerance but hope this is ok?!

 

[jerryjerry05]

That's right where you need to be.
The 7# pumps are usually an automotive pump.

 

[boatingmark]

That's right where you need to be.
The 7# pumps are usually an automotive pump.

Good stuff! Least thats one less thing to worry about :laugh: