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Fuel pump leak.......
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Topic: Fuel pump leak....... (Read 4543 times)
March 03, 2010, 06:04:08 pm
Patrick
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Fuel pump leak.......
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on:
March 03, 2010, 06:04:08 pm »
Wife's 91 golf 1.6 NA has sprung a leak on the backside of the injection pump. Looks like it MIGHT be at that oddball looking plug that (I think) has to do with the timing advance, or maybe where the head bolts on. Fuel is running of a boss for a vertical bolt hole.........
What's chances of pulling the pump off and changing an o-ring or something and putting it back on? Or should I try one of the pumps I have on the shelf? got a couple good turbo pumps, one NA pump in unknown condition.
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Reply #1
March 03, 2010, 09:30:27 pm
vanbcguy
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Re: Fuel pump leak.......
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Reply #1 on:
March 03, 2010, 09:30:27 pm »
Probably the cold start advance... Seen a lot of people report that leaking on their pumps. I think it's FAIRLY simple to repair - there's definitely some threads about that on here.
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Bryn
1994 Jetta - AHU M-TDI - Jezebel Jetta
2004 Jetta Wagon - 1.8T - Blitzen
Reply #2
March 03, 2010, 09:55:47 pm
burn_your_money
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Re: Fuel pump leak.......
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Reply #2 on:
March 03, 2010, 09:55:47 pm »
If it's the cold start then yeah it's pretty easy. If it's the head o-ring it's a big job. Either way the pump needs to come off.
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Tyler
Reply #3
March 04, 2010, 06:08:04 am
Patrick
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Re: Fuel pump leak.......
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Reply #3 on:
March 04, 2010, 06:08:04 am »
Thanks guys. Figured it will have to come off. drips off the end of the pump near the head...........
Going to have a better look at it tonight with a small mirror while it's running.
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Reply #4
March 04, 2010, 07:53:54 pm
Patrick
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Re: Fuel pump leak.......
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March 04, 2010, 07:53:54 pm »
Looks like it is the head o-ring. Tried pulling apart a pump off the shelf to see what I'm getting into. Got all the torx bolts out, head won't come off. Do I need to pull anything else to get the head off? I'm not having much luck with the search............
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Reply #5
March 04, 2010, 08:38:04 pm
Patrick
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Re: Fuel pump leak.......
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Reply #5 on:
March 04, 2010, 08:38:04 pm »
skip it. Got the head off my practice piece, NOT going to attempt this on the car!
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Reply #6
March 04, 2010, 08:43:39 pm
theman53
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Re: Fuel pump leak.......
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Reply #6 on:
March 04, 2010, 08:43:39 pm »
If I remember right when changing that seal you aren't supposed to take the pump head off. Just stretch it over and remove one bolt at a time...pull the pump head out just enough to get the seal on and put it all back.
I haven't done it just read about it.
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Reply #7
March 04, 2010, 11:25:51 pm
burn_your_money
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Re: Fuel pump leak.......
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Reply #7 on:
March 04, 2010, 11:25:51 pm »
Quote from: Patrick on March 04, 2010, 08:38:04 pm
NOT going to attempt this on the car!
Smart. It's not worth the risk in my opinion.
If you do change your mind and attempt it in the car, follow Andrew's method. There are a lot of wrong way's to do it posted on the net.
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Tyler
Reply #8
March 05, 2010, 06:24:14 am
Patrick
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Re: Fuel pump leak.......
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Reply #8 on:
March 05, 2010, 06:24:14 am »
Thanks guys, but I see too many things to go wrong. I'm just going to swap pumps until I find a good one. I've got one NA pump on the shelf condition unknown. Also have 2 turbo pumps (one partially dissassembled!) and two more on engines, one of which I know is good. Might wind up sending the takeout pump to Giles/tyler for a reseal.......
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Reply #9
March 06, 2010, 04:16:53 pm
Patrick
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Re: Fuel pump leak.......
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Reply #9 on:
March 06, 2010, 04:16:53 pm »
Update:
1st pump I tried looks like it will work. Took a little fussing, but it fired. I'm a little confused. Dial indicator said I couldn't get anywhere close to where I should be, so I decided to see if it would fire up (it did) and go from there. Lots to put back together yet, but headed in the right direction. Did someone put out an aftermarket pump with no markings on the front? Looks like a Bosch, but there's no numbers on the boss on the front of the pump where there should be. There's some numbers on the boss on the BACK of the pump, don't look like the standard Bosch stuff. Suppose I should have taken a picture.....
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Reply #10
March 06, 2010, 05:12:49 pm
burn_your_money
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Re: Fuel pump leak.......
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Reply #10 on:
March 06, 2010, 05:12:49 pm »
You should take a picture. Typically (but not always) if the numbers are stamped on that side of the housing then it's a left hand rotation pump.
VW also used laser etching (or something similar) on some of the later pumps and it wears off very easily. You could have one of those ones.
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Tyler
Reply #11
March 06, 2010, 08:26:02 pm
Patrick
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Re: Fuel pump leak.......
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Reply #11 on:
March 06, 2010, 08:26:02 pm »
Too late to get the numbers that ARE on the pump, they're on the back and it's in the car. Rotates the right way (car runs). I'll finish putting it together in the morning. I'll check the timing again in the morning too. couldn't seem to rotate it far enough to get the advance I like to run, but we'll see. Is there anything inside the pump that might have been stuck in the advance mechanism? pump was on an engine I had sitting in a trailer for two or three years. Condition of the engine unknown, came out of a '91 jetta with about 440,000 km that was headed for the crusher.
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Reply #12
March 06, 2010, 08:32:48 pm
burn_your_money
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Re: Fuel pump leak.......
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Reply #12 on:
March 06, 2010, 08:32:48 pm »
If you can't get the number you are looking for on the dial gauge then move the pump pulley one tooth
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Tyler
Reply #13
March 07, 2010, 07:04:43 am
Patrick
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Re: Fuel pump leak.......
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Reply #13 on:
March 07, 2010, 07:04:43 am »
Thought of that, but haven't tried it yet. Haven't figured out WHY it's happening.......
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Reply #14
March 07, 2010, 08:06:55 pm
Patrick
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Re: Fuel pump leak.......
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Reply #14 on:
March 07, 2010, 08:06:55 pm »
Had to jump it one tooth, haven't figured out why. Runs fine, but a little short on power compared to the last pump. If the wife wants more I'll have to turn a screw......
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VWDiesel.net The IDI, TDI, and mTDI source.
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Fuel pump leak.......