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Fuel Pressure/engine stavation issues


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roppa440

Club Member

Thu 21 Sep 17 15:57

Re: Fuel Pressure/engine stavation issues


I had to look up on my own old forum what spec Carter pump I used. 120 Gallon per hour.

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aaroncorvette

Club Member

Thu 21 Sep 17 17:04


I had a starvation issue that bugged me for a about a year.

In the end I took the tank out and had it cleaned, there was about a tube of clear silicon in the tank! Not sure whether someone had put it there to spite the previous owner or he did it for some reason.

The filter sock was also split, this allowed the silicon into the filter and into the carb filter.

I had the tank repaired and painted, a new sock, new fuel lines and a new filter.

If I were you i'd pull the tank and clean it up, renew the fuel lines, drop the sender and check out the sock etc. I'm sure you'll find something amiss as you go through it. These are old cars after all.


--------------------
'71 vette convertible + the odd mod.
I thought we won the war?

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langlj00

Club Member

Fri 22 Sep 17 13:59

Re: Fuel Pressure/engine stavation issues


Put the old pump back on (if you've still got it) and try that.

I had a stock pump that couldn't keep up a few years ago (A new stock pump cured it). I realise that yours is not like that - but my point is pumps do go bad.....

Jeremy.


--------------------
1974 / 350 / Auto / T-Top

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roscobbc

Committee Member

Fri 22 Sep 17 16:51

Re: Fuel Pressure/engine stavation issues


langlj00 wrote (View Post):Put the old pump back on (if you've still got it) and try that.

I had a stock pump that couldn't keep up a few years ago (A new stock pump cured it). I realise that yours is not like that - but my point is pumps do go bad.....

Jeremy.


Irritatingly the stock appearing replacement pump required a fair bit of 're-plumbing' so the original pump won't connect-up now.


--------------------
CCCUK Chairman & Editor, Vette News
'68 coupe - 4 speed - 3.08 - 489 cu in - 570 bhp @ 5850 rpm - 606 ft/lbs torque (821 Newton Metres) @ 3850 rpm
Image

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roscobbc

Committee Member

Sun 01 Oct 17 17:06

Re: Fuel Pressure/engine stavation issues


Now we've got Octobers Vette News all ready to go to the printers and the pressure from my daily 'paid' job has eased off I have been looking over the Vette to see what can be the cause of the fueling issues. Checked all flexible hoses - they are fine with no internal degrading. Thinking back on things and the recently renewed high volume fuel pump should have a maximum output pressure of 6.5 psi. Mine was showing (when showing any pressure at all) 4.5 to 5 psi - and then sometimes zero.
1968 L36 has an unusual fuel supply routing and uses a sealed metal canister fuel filter in between the fuel pump and carb. It also features a 1/4" return line to the fuel tank to keep the fuel circulating at all times (guess it help prevent percolation) This filter was used for one year only and long discontinued - if you can get one you'll pay $40+ for it. Most people use a similar filter used on Jeeps at less than a third of the price (as in fact I did). Removed the filter and a fair bit of sediment and rust particles came out with the dripping fuel.............dripping fuel wasn't right, and when I had dried the filter out I tried blowing through it and was surprised how restrictive is was. I'm guessing this would be the reason for low fuel reading showing on the fuel pressure gauge. Strange that it only showed up as a problem just recently when it had been installed over year ago. Perhaps the dirt in the filter, coupled with the pressure restriction and full throttle use for more than just a few seconds was enough to create the problem. Did the same checks on the old canister filter and there is minimal pressure restriction when blowing through it - I'll get some new hose fittings during the week, re-install and try it out after Yes


--------------------
CCCUK Chairman & Editor, Vette News
'68 coupe - 4 speed - 3.08 - 489 cu in - 570 bhp @ 5850 rpm - 606 ft/lbs torque (821 Newton Metres) @ 3850 rpm
Image

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roscobbc

Committee Member

Wed 04 Oct 17 19:26

Re: Fuel Pressure/engine stavation issues


Update. Took old filter along to Customville yesterday and compared my 9 month old) fuel filter with a new one. Difference was amazing - virtually no restriction when blowing though new filter (compared with 'old' one) - guess I shouldn't complain as the old filter did its job (and perhaps I need to clean-out the fuel tank)



Last edited by roscobbc on Wed 04 Oct 17 19:27; edited 1 time in total. [1 %]
--------------------
CCCUK Chairman & Editor, Vette News
'68 coupe - 4 speed - 3.08 - 489 cu in - 570 bhp @ 5850 rpm - 606 ft/lbs torque (821 Newton Metres) @ 3850 rpm
Image

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CaptainK

Club Member

Mon 23 Oct 17 13:43


I have a 1968 327, so I'm interested to hear if this filter problem would be the same with my engine setup (standard 1968 327/300hp). And if it is - where do I get the Jeep similar cheaper filters? Smile

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roscobbc

Committee Member

Mon 23 Oct 17 16:16

Re: Fuel Pressure/engine stavation issues


Can't speak for the 327 - but the stock set-up in '68 for the L36 427 was a steel canister filter just in front of the passenger side cylinder head. Its fed by a steel line from the fuel pump. It has one inlet and two outlets - one of the two outlets feeds the carb. The other, smaller diameter outlet is a return to the fuel tank. Yours may not have this. The filter is a long discontinued GM part - now available as a repro' part from some of the USA Vette specialists at $60 or so. The Jeep part is about 9 from Customville - its not a direct swap with the steel lines but can be adapted.


--------------------
CCCUK Chairman & Editor, Vette News
'68 coupe - 4 speed - 3.08 - 489 cu in - 570 bhp @ 5850 rpm - 606 ft/lbs torque (821 Newton Metres) @ 3850 rpm
Image

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CaptainK

Club Member

Thu 26 Oct 17 11:41

Re: Fuel Pressure/engine stavation issues


roscobbc wrote (View Post):Can't speak for the 327 - but the stock set-up in '68 for the L36 427 was a steel canister filter just in front of the passenger side cylinder head. Its fed by a steel line from the fuel pump. It has one inlet and two outlets - one of the two outlets feeds the carb. The other, smaller diameter outlet is a return to the fuel tank. Yours may not have this. The filter is a long discontinued GM part - now available as a repro' part from some of the USA Vette specialists at $60 or so. The Jeep part is about 9 from Customville - its not a direct swap with the steel lines but can be adapted.
Nice one thanks. I'll have to have a looksee when I next go to the garage where the Vette is stored. Smile

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