Fuel pump problems??? 1973 SAAB 99LE F.I.

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Fuel pump problems??? 1973 SAAB 99LE F.I.

Postby GOLFGURU » Fri Feb 02, 2018 8:08 pm

Started to buck on me upon acceleration...Started to happen gradually...changed filter,same thing.. I have a psi gauge 0n fuel rail and psi had to be adjusted a few times,went from 28 psi down to 24...Maybe pump is going bad..Any good way to check flow volume ect? this bosch pump should push 50 ltrs.per hour,thats almost a liter per minute.. thx all.. :rolleyes:

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Crazyswede
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Re: Fuel pump problems??? 1973 SAAB 99LE F.I.

Postby Crazyswede » Sat Feb 03, 2018 6:27 pm

Assuming its Djet?
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Re: Fuel pump problems??? 1973 SAAB 99LE F.I.

Postby GOLFGURU » Mon Feb 05, 2018 7:14 pm

Yes it is...Drained fuel tank and petro was a bit on the brownish side..Seemed to help..But I think its more of a ignition problem,maybe points or a weak coil...Tested pump and it seemed pretty solid,almost a liter per minute..

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Re: Fuel pump problems??? 1973 SAAB 99LE F.I.

Postby 99Super » Mon Feb 05, 2018 9:20 pm

How are your ignition points, the ones for the D-Jet? They might be due for a cleanup.

Do you need a manual? I have a factory 69-74 manual, and here are the Mitchell pages for the FI:

https://photos.app.goo.gl/mxjNV8M3vI8l9YQ53

You can disconnect the flexible part of the fuel hose at the fuel rail and use the manual instructions to jumper the pump.

John
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Re: Fuel pump problems??? 1973 SAAB 99LE F.I.

Postby GOLFGURU » Tue Feb 06, 2018 3:15 pm

I think your right John,it's more of a deadspot than a fuel feel...Checked dwell and its off by a few...Have a maual thx,Joe Fp lines seemed a little kinked,gonna just lay pump on a towel instead of mount,lines seem like they have too much bend...

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Re: Fuel pump problems??? 1973 SAAB 99LE F.I.

Postby Crazyswede » Tue Feb 06, 2018 4:08 pm

If you ever get tired of the Djet and not a stickler for keeping it 100% original you could swap it over to LH injection. The LH injectors work nicely in the D jet manifold and all the components mount easily enough. The LH harness and computer are also a nice contained system so its mostly a manner of laying in the harness, figuring out a couple of connections and mounting the computer.
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Re: Fuel pump problems??? 1973 SAAB 99LE F.I.

Postby 99Super » Tue Feb 06, 2018 8:11 pm

Seth is right, it would be a reasonably simple swap that would help reduce the issues with the MAP sensor. I should have done that rather than swap to carbs on my 73 EMS.

I wasn't talking about your ignition points, I was talking about the D-Jet points. That's the funny plug on the side of your distributor.

The second page of the manual in the link I sent you (page 13) covers those points.

John
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Re: Fuel pump problems??? 1973 SAAB 99LE F.I.

Postby GOLFGURU » Wed Feb 07, 2018 2:53 pm

Crazyswede wrote:If you ever get tired of the Djet and not a stickler for keeping it 100% original you could swap it over to LH injection. The LH injectors work nicely in the D jet manifold and all the components mount easily enough. The LH harness and computer are also a nice contained system so its mostly a manner of laying in the harness, figuring out a couple of connections and mounting the computer.

Thanks Swede,gonna keep ot original...Will keep it in mind if she keeps giving me trouble...

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Re: Fuel pump problems??? 1973 SAAB 99LE F.I.

Postby GOLFGURU » Wed Feb 07, 2018 2:56 pm

99Super wrote:Seth is right, it would be a reasonably simple swap that would help reduce the issues with the MAP sensor. I should have done that rather than swap to carbs on my 73 EMS.

I wasn't talking about your ignition points, I was talking about the D-Jet points. That's the funny plug on the side of your distributor.

The second page of the manual in the link I sent you (page 13) covers those points.

John
Got you John,found a brand new set of injector points a few years ago,they have less than a few k miles..Will check em though..


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