Jump to content


Welcome to Ultimate Subaru Message Board, my lurker friend!

Welcome to Ultimate Subaru Message Board, an unparalleled Subaru community full of the greatest Subaru gurus and modders on the planet! We offer technical information and discussion about all things Subaru, the best and most popular all wheel drive vehicles ever created.

We offer all this information for free to everyone, even lurkers like you! All we ask in return is that you sign up and give back some of what you get out - without our awesome registered users none of this would be possible! Plus, you get way more great stuff as a member! Lurk to lose, participate to WIN*!
  • Say hello and join the conversation
  • Subscribe to topics and forums to get automatic updates
  • Get your own profile and make new friends
  • Classifieds with all sorts of Subaru goodies
  • Photo hosting in our gallery
  • Meet other cool people with cool cars
Seriously, what are you waiting for? Make your life more fulfilling and join today! You and your Subaru won't regret it, we guarantee** it.

* The joy of participation and being generally awesome constitutes winning
** Not an actual guarantee, but seriously, you probably won't regret it!

Serving the Subaru Community since May 18th, 1998!

Guest Message by DevFuse
 

Photo
- - - - -

Fuel pump question


  • Please log in to reply
10 replies to this topic

#1 In2toys

In2toys

    New User

  • Members
  • PipPip
  • 28 posts
  • Aurora, CO

Posted 10 November 2005 - 10:08 PM

91 loyal FI With less than 1/2 tank of gas, it likes to stall out at stop signs, or surge ahead after almost stalling. Fill the tank & it runs great till you get to about 1/4 tank & starts the process over again. No cel. I replaced the pump with a pull n save pump when we first bought it about 2 months ago due to the little rubber tip on the end being gone & spraying fuel everywhere. Then this starts shortly after.

I browsed some sites last night looking for fuel pumps & they had a note in the description saying alot of fuel pump issues are actually fuel pressure regulaters issues. Any thoughts on this?

Thanks in advance.

#2 grossgary

grossgary

    Elite Master of the Subaru

  • Members
  • 20,080 posts
  • WV

Posted 10 November 2005 - 10:15 PM

could you have bad gas or water in the gas.....filling up just dilutes the bad stuff enough that you don't notice? first i would try lots of whatever gas treatments you use to remove water. if you still had the old pump you could swap it on (eventhough it sprays) to see if the problem goes away.

#3 nipper

nipper

    Semi Elite Master of the

  • Members
  • 17,634 posts
  • Long Island NY

Posted 10 November 2005 - 10:32 PM

Well they are right, especially with electric fuel pumps. Get a fuel pressure gauge on the car and watch it. Fuel pump issues tend to be continous, and not related to the fuel level of the tank, ie starvation on heavy throttle.
Have you tried removing the gas cap when this problem happens. It could be a vaccume lock in the tank, which can be traved back to the charcoal canister system.... that would always occure at the same tank level.

nipper

#4 In2toys

In2toys

    New User

  • Members
  • PipPip
  • 28 posts
  • Aurora, CO

Posted 10 November 2005 - 11:20 PM

Grrrrr. I was just about finished typing this in & I accidently hit the clear button on the keyboard. Poof gone.... :banghead:

ANYWHO, I have a retired master mech friend who agrees with the gunk / water in the tank theory. I threw a can of Heat in the last tank to see if that helps, Any other suggestions on Brand? I toyed with pulling the tank & flushing it out till I read manual & figgered it was kinduva job...

No on the vapor lock. Not when I refill the tank anyway. Old pump is gone, But It may be worth a trip to pull n save again to try & rule it out.

Could the fuel pressure reg. be causing this???

#5 Snowman

Snowman

    Midnight Passenger

  • Members
  • 3,538 posts
  • Haines

Posted 10 November 2005 - 11:58 PM

Could the fuel pressure reg. be causing this???


Not to my knowledge.


One possibility from way out in left field: My car occasionally starves for fuel while stopping or turning below 1/4 tank. This is because my car started out with a carburetor and was converted to fuel injection later on. The F.I. fuel tanks have some baffles inside that keep plenty of fuel available to the pump at all times, but they didn't have those on carbed cars (no need). It may be possible that your car had a tank put on it from a carbed soobie, due to the original one rusting out or being damaged.

That is HIGHLY unlikely, but something to consider if the problem doesn't go away.

#6 nipper

nipper

    Semi Elite Master of the

  • Members
  • 17,634 posts
  • Long Island NY

Posted 11 November 2005 - 12:28 AM

ARe the tanks on trhe 91's like the later legacies. The fuel pump is accessed from a plate inside the car ... and its a split tank if its AWD, or is just on tank. i was thinking if it is a fuel qaulity issue... remove the cover, take a jar wiht a cord attached to it. Get a feul sample and let it sit for 1/2 hr then examine it, If it is contmainated fule it will be seen in the jar. If this is the problem your going to have the tank cleaned, otheriwse you eil never get rid of the contamination.

Just a thought.

nipper

#7 In2toys

In2toys

    New User

  • Members
  • PipPip
  • 28 posts
  • Aurora, CO

Posted 11 November 2005 - 12:36 AM

The fuel pump is on the outside of the tank. Good thought though. Theoretically, I could disconnect the fuel line before the pump & take a sample from their, or siphon some out I spose...

#8 nipper

nipper

    Semi Elite Master of the

  • Members
  • 17,634 posts
  • Long Island NY

Posted 11 November 2005 - 12:57 AM

no that wont work .... and im getting a better understandong now. the idea is to take the sample as it sits unstirred in volume of the tank, at the level it happens. Have you checked the sock filter in the tank?
With it being an external pump, i may start to agree with contamination. With the external pump, you can always dissconnect the hose, hot wire the pump, and drain it all out that way... but stl no guarente that you will get it all. Sounds like you need to drop the tank and get it cleaned.

nipper

#9 In2toys

In2toys

    New User

  • Members
  • PipPip
  • 28 posts
  • Aurora, CO

Posted 11 November 2005 - 08:58 AM

Nope on the sock filter... How would an individual go about that? I read on some models you can pop the back seat, remove an access cover, & get to the sending unit. Would the sock filter be there, or did I just fall for the "check the muffler belt" routine? :grin:

thanks for your help guys. jerry

#10 nipper

nipper

    Semi Elite Master of the

  • Members
  • 17,634 posts
  • Long Island NY

Posted 11 November 2005 - 10:09 AM

thats exactly where it would be. That wil also give you a very good ideal as to what is going on inside the tank.


nipper

#11 pattiandruss

pattiandruss

    New User

  • Members
  • PipPip
  • 22 posts
  • Klamath Falls

Posted 11 November 2005 - 11:34 AM

There is some goop that you smear on a wire and stick into the tank. It turns color if there is water, and the wire should let you get to the bottom of the tank. Don't know where you would get this stuff, but gas stations use it to check their storage tanks. Russell




0 user(s) are reading this topic

0 members, 0 guests, 0 anonymous users