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FE Power Forums => FE Technical Forum => Topic started by: machone on October 09, 2016, 05:44:47 AM

Title: Fuel pump bolts
Post by: machone on October 09, 2016, 05:44:47 AM

Hi,
Just noticed my fuel pump was hanging off the engine, hence why it wouldn't idle and ran so rough.
Stripped threads so, what size tap should be run through the threads and what size are the correct bolts?

Thanks
Naz

Title: Re: Fuel pump bolts
Post by: blykins on October 09, 2016, 06:23:50 AM

They are 3/8-16, but if it's stripped like that, you can probably count on installing a helicoil into the timing cover.

Title: Re: Fuel pump bolts
Post by: Ranch on October 09, 2016, 07:33:03 AM

Those threaded holes are pretty deep so hopefully you can clean up any damage and this time use studs.  Aluminum is not the best material to use a short bolt in and especially if you don't have the eccentric pressure off the lever and you are trying to pull the pump in.   JMO

Title: Re: Fuel pump bolts
Post by: My427stang on October 09, 2016, 09:58:05 AM

I'd helicoil both holes, easiest way for it to be fixed

Title: Re: Fuel pump bolts
Post by: turbohunter on October 09, 2016, 10:22:55 AM

Hmm, Ranches idea of using studs is interesting to me.
As many times as I've installed/replaced a pump while on the truck or car and trying to get those damn bolts started around all the kerfufell in there. >:(
Of course I realize taking off hoses, brackets and installing before in vehicle would be much easier but still just a thought I'll keep in the back of my somewhat pee sized brain for later.

Title: Re: Fuel pump bolts
Post by: blykins on October 09, 2016, 10:55:48 AM

The stud idea may actually work if you can use a stud long enough to engage threads that are still good. 

Title: Re: Fuel pump bolts
Post by: My427stang on October 09, 2016, 03:05:38 PM

IMHO, bad threads are bad threads, there isn't a lot of material there.  Helicoil and if you want studs, fine, but although there isn't much of a load there, when you tighten things up isn't the time to find there wasn't enough thread.

Title: Re: Fuel pump bolts
Post by: machone on October 10, 2016, 03:27:08 AM

Ok, fixed the fuel pump mounting issue by inserting a stud in one hole and a longer bolt in the other.
Now , car wont start/run, if it does its very rough, then dies

Thinking it might be a carb issue? Your thought please.

Thanks again
Naz

Title: Re: Fuel pump bolts
Post by: Drew Pojedinec on October 10, 2016, 07:14:10 AM

Did you check to see that you are getting appropriate fuel pressure?

Title: Re: Fuel pump bolts
Post by: machone on October 10, 2016, 05:30:00 PM

Drew, was running fine before hand?

Title: Re: Fuel pump bolts
Post by: Drew Pojedinec on October 10, 2016, 07:37:36 PM

I'd just want to check the eccentric, and the fuel pump (you can even do it by hand if need be).
I've never had a fuel pump "hanging off the engine" but I imagine some damage could occur.

I know with the old 7.3 diesels, if you didn't make sure the fuel pump arm was under the eccentric when you installed, it could break.  It's kinda ingrained in my head to check everytime now.

Good luck

Title: Re: Fuel pump bolts
Post by: machone on October 11, 2016, 04:38:38 AM

Drew,
Took the fuel line off at carb and put line in a bucket, turned her over and plenty of fuel there, so indicates pump is fine.
Suspecting something wrong in the carb?

Title: Re: Fuel pump bolts
Post by: Drew Pojedinec on October 11, 2016, 09:21:45 AM

A better description of everything may help folks out.  Otherwise I'd just start simple.

-Do you have good spark?
-recheck timing
-fuel filling the bowls properly?
-what else did you touch/change/alter?

etc.