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dwalex

help, or support fuse 11 blows on my 72 tii

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I replaced the fuse last month on it drove about twenty miles. I drove to work today, then came home, about 20 miles. It blows again, total mileage 44 miles. Car dies, won't start again. Everything works except the car firing up. I'm pretty sure it is the fuel pump, as I have very little on that circuit that can draw that much. Oh yeah once I replaced the fuse, it blew as soon as I tried to start it. This happened twice in a row. What else do I need to do if I want to test the pump?

Thanks

Dave

72 tii Tupelo Honey

03 z4 no name yet, still in the discussion stages....

67 gt-6. ##*-+%&!!!

2012 fiat 500s Quiche Lorraine

Ex mini cooper, healey, alpine, Bavaria, 02 and many gt-6 owner

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There are a few things you can check, just to eliminate them as culprits regarding fuel pump failure:

1) lift the fuel pickup unit from the tank and clean / replace the fine mesh filter at the bottom. These get packed with a thin clay-like coating that restricts fuel. If the fuel pump is straining to draw fuel from a restricted supply source, it might over heat causing your fuse blow.

2) Though they're often missing, the factory put a small cone filter INSIDE the inlet nipple of the pump, itself. Remove the supply hose to the pump and check this cone shaped screen.

3) Check for excessive current draw from the motor

tii pumps are expensive, but the E28 / E24 (mid 80s 5 and 6 series) pump substitute repair works well, if you're not a stickler for originality. I ran mine on one for about a year. No problems. Much less expensive. I'm a purist though, so I installed a nice used tii pump. (I keep the 5 series pump in the trunk on road trips though).

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Sounds like your tii electric fuel pump is drawing too many amps and blowing the fuse.

Might be a simple clogged fuel filter or screen that is making the pump work harder than normal.

When was the last time you changed the metal canister in the front and cleaned all the little screens:

1) Flat One inside tank

2) Cone-shaped one just before the pump

3) Barrel-shaped one at the KF pump head

4) Tiny cone-shaped one at the cold start valve

My bet is screens # 1 and 2. # 1 is the primary culprit.

If your filter is good and screens are not clogged, then the pump may be due for a replacement.

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Thanks, Paul

I'll pull the pump this weekend. I kind of think that the first suggestion will be what I find. I've had it for 15 years, with no attention paid to the pump.

Guess I need to pay attention now

Dave

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I think on #2 there is a small spring clip that must be removed to get to the filter. That will jump to the next county if you are not careful.

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Thanks,

I replaced the can (fuel filter) in 2004. Haven't cleaned the screens ever. Fifteen years later...oops. You know what is really funny about this, I was coming home from a friend's place after looking at his boat motor and advising him that he needs a fuel pump. I was actually coming home to get one!

Dave

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I think on #2 there is a small spring clip that must be removed to get to the filter. That will jump to the next county if you are not careful.

Bill - there is a triangular shaped clip holding the barrel-shaped screen # 3 (not cone-shaped as I listed above).

There is a tiny clip holding the pressure maintenance valve plunger.

# 1

IMG_0983.jpg

# 2

c32a0c8f.jpg

fed70bae.jpg

#3

pics10162010011.jpg

# 4

coldstartmeshfilter.jpg

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Thanks, Bill,

I'll do that. I just got rid of a 69 that had a supply of them . Guess I need to stock up.

Dave

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I think on #2 there is a small spring clip that must be removed to get to the filter. That will jump to the next county if you are not careful.

Bill - there is a triangular shaped clip holding the barrel-shaped screen # 3 (not cone-shaped as I listed above).

There is a tiny clip holding the pressure maintenance valve plunger.

# 1

IMG_0983.jpg

# 2

c32a0c8f.jpg

fed70bae.jpg

#3

pics10162010011.jpg

# 4

coldstartmeshfilter.jpg

Jim, thank you both for the input and the pictures. I'm a visual person, and this helps me immensely.

Regards,

Dave

......this is one of the reasons that I love this forum so much.....

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You're welcome Dave. Glad to help just like all the others here who have helped me out many times. You have to start somewhere.

Here is the location of # 4. New BMW cold start valves should have this screen already installed - mine did.

coldstartvalve.jpg

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That is it Jim, thanks for the correction.

Sorry if I stepped on your toes Bill. You and Ruth have way more experience with these little cars than I do (and she makes some mean brownies!).

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Thanks, Jim,

I have one more question. When I clean the screens, is there a special cleaner (like marvel mystery oil, we, kerosene, etc.) that you use? Or just a rag? I've got time if it needs to soak for awhile.

Dave

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