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Fuel pump

Moderator: Mod Squad

tdlund
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Fuel pump

Post #1 by tdlund » Sat May 26, 2018 10:54 pm

Would the manual fuel pump on these engines ever produce intermittent problems or would they just not work all together?

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falconcritter
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Re: Fuel pump

Post #2 by falconcritter » Sun May 27, 2018 7:02 pm

You need to post your issues that you are having ! I have had issues in the past with my 65 Comet that threw a lifetime mechanic into a tie-wrait! He did everything he could to fix it Except change the fuel pump . He told me to take my car elsewhere ! I posted my issues with the car and five people on this site all made the right diagnosis!
1969 Ford Falcon 2Door and future home for my Australian 250 2V , 2013 Ford F-150 Single Cab , 2018 Ford Escape S

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chad
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specific problem?

Post #3 by chad » Mon May 28, 2018 1:43 am

's a good point:
state the prob U have (w/o diagnosis) for optimal answ.

Answ" "Yes, Anything's possible". :rolflmao: Sorry...

a fuel volume issue? - needle'n seat clog?

Otherwise we'll tell ya how an arm is actuated by the cam lobe, how to put a bucket under'n watch the fuel rate flow, yetah, yetah...
Keep talkin, we're here
:thumbup:
Last edited by chad on Mon May 28, 2018 10:20 pm, edited 2 times in total.
"Big thing is only make one change at a time. Change 2 or more things at a time it becomes difficult to figure which change helped or hurt" turbo2256b » 1/16/2017
Chad - '70 LUEB on '77 frame (i.e. PS, D44, trapezoidal BB 9", 4.11), 250, NV 3550 & DSII to B transplanted, "T" D20/PTO, 2" SL, 1" BL, 4 discs, 33"X15", tool boxes, etc. Seeking: Hydraulic gear motor for Koenig pto. chrlsful@aol.com (413) 259-1749

CZLN6
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Re: Fuel pump

Post #4 by CZLN6 » Mon May 28, 2018 10:16 am

Howdy Tdlund:

Yes, a Mechanical fuel pump can give intermittent trouble. First step is to replace the fuel pump. IF that doesn't end the symptoms the next step is to assess the condition of the eccentric lobe on the cam. Occasionally the fuel pump lobe goes flat. in that case an electric fuel pump is the solution.

I hope that helps you. Let us know what you find.

Adios, David
co-author of the Falcon Performance Handbook
http://www.falcon6handbook.com/

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wsa111
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Re: Fuel pump

Post #5 by wsa111 » Mon May 28, 2018 10:26 am

Pull your oil dipstick & smell the oil on the dipstick for a gas smell. If the diaphram leaks it will leak gas into the crankcase.
Also check the vent orifice on the pump body for fuel leaking.
As David said check the eccentric on the camshaft.
If in doubt replace the pump, cheap insurance.
Carter makes the best mechanical pump.
67 mustang,C-4, with mod. 80 hd, custom 500 cfm carb with annular boosters, hooker headers, dual exh.-X pipe, flowmaster mufflers, DSII dist. MSD-6al & MSD-Blaster 8252 Coil. Engine 205" .030" over with offset ground crank & 1.65 roller rockers. 9.5 comp., Isky 262 cam.
2003 Ford Lightning daily driver. Recurving Distributors. billythedistributorman@live.com
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tdlund
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Re: Fuel pump

Post #6 by tdlund » Mon May 28, 2018 7:24 pm

Okay here’s my symptoms

While driving down the road the engine dies. If I let off the gas pedal it will idle fine. If I stay on the gas it surges with big gaps between each surge. It goes away by the time I can stop and see if there’s fuel in the fuel filter.

I have checked the float level and it looks good. I’m 99% sure it starves for fuel because my afr gauge goes so lean that it stops reading.

I have done some simple tests by giving it full throttle for as long as I feel comfortable and it doesn’t die. So I feel like it’s not carb issue.

What do you guys think?

I’m thinking fuel pump or vapor lock

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bubba22349
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Re: Fuel pump

Post #7 by bubba22349 » Mon May 28, 2018 7:34 pm

Yes it definitely sounds like a fuel volume issue! For sure those could be causes but it also can be as simple as a plugged up fuel filter. Good luck :thumbup: :nod:
A bad day Drag Racing is still better than a good day at work!

I am still hunting for a project car to build but with my current low budget it's not looking so good. My Ex- Fleet of Sixes these are all long gone! :bang: 1954 Customline 223 3 speed with O/D, 1963 Fairlane project drag car with BB6, 1977 Maverick 250 with C4, 1994 F-150 a 300 with 5 speed.

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chad
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surging on acceleration (& WOT?)

Post #8 by chad » Mon May 28, 2018 7:39 pm

U can ck the fuel system but
'...I stay on the gas it surges with big gaps between..."
I think it's "ele".
"Big thing is only make one change at a time. Change 2 or more things at a time it becomes difficult to figure which change helped or hurt" turbo2256b » 1/16/2017
Chad - '70 LUEB on '77 frame (i.e. PS, D44, trapezoidal BB 9", 4.11), 250, NV 3550 & DSII to B transplanted, "T" D20/PTO, 2" SL, 1" BL, 4 discs, 33"X15", tool boxes, etc. Seeking: Hydraulic gear motor for Koenig pto. chrlsful@aol.com (413) 259-1749

Soldmy66
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Re: Fuel pump

Post #9 by Soldmy66 » Mon May 28, 2018 8:18 pm

When was the last time you changed your fuel filter?

tdlund
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Re: Fuel pump

Post #10 by tdlund » Tue May 29, 2018 6:33 pm

The oil does seem to have a bit of a gas smell to it. Should I go ahead and get a new pump and see what happens or is there some electrical diagnosis I can do first?

When I say there’s big gaps between surges, I mean, when I stay on the gas while it’s dying, it acts like it gets a little fuel and then dies for a little then acts like it gets a little fuel again. This goes on for a 30 too 45 seconds.

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JackFish
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Re: Fuel pump

Post #11 by JackFish » Tue May 29, 2018 6:42 pm

Don't forget to change your oil! :thumbup:
1978 Ford Fairmont station wagon
1978 Ford Fairmont station wagon
Yup, I bought another one.
1996 Chevy Caprice 9C1 (3)
1999 Dodge Ram 2500

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falconcritter
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Re: Fuel pump

Post #12 by falconcritter » Tue May 29, 2018 7:10 pm

I had this problem with my Mercury Comet . It would start fine , idle fine , but once warmed up and driving it would shut off and coast and come on again and again and again and .. die . And I would pull over , let it cool down and take it home . The Mechanic was sure it was vapor lock and said the fuel pump was not the problem . But he was wrong .. it was ! After lots of my money he said take it else where . My Comet had the Canister Filter on top and the diaphragm was bad .
1969 Ford Falcon 2Door and future home for my Australian 250 2V , 2013 Ford F-150 Single Cab , 2018 Ford Escape S

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JackFish
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Re: Fuel pump

Post #13 by JackFish » Wed May 30, 2018 12:05 am

A vacuum leak can also cause a similar surging problem.
Or a bad coil.
1978 Ford Fairmont station wagon
1978 Ford Fairmont station wagon
Yup, I bought another one.
1996 Chevy Caprice 9C1 (3)
1999 Dodge Ram 2500

ags290
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Re: Fuel pump

Post #14 by ags290 » Wed May 30, 2018 10:32 am

For what it is worth I battled a similar issue a couple of years ago and corrected it with a fuel pump. X2 on making sure you change the oil if it smells like fuel.
Kevin
Early 1965 Mustang with a 170

tdlund
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Re: Fuel pump

Post #15 by tdlund » Wed May 30, 2018 10:21 pm

Do you guys have a preference on staying with a manual pump or going electric?

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JackFish
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Re: Fuel pump

Post #16 by JackFish » Thu May 31, 2018 12:21 am

An electric pump would require a pressure regulator and return line.
And overkill for an engine that needs about 3-5lbs of pressure.
1978 Ford Fairmont station wagon
1978 Ford Fairmont station wagon
Yup, I bought another one.
1996 Chevy Caprice 9C1 (3)
1999 Dodge Ram 2500

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chad
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ele v mechanical fuel pump

Post #17 by chad » Thu May 31, 2018 1:02 am

just thinkin the mechanical is much safer
"Big thing is only make one change at a time. Change 2 or more things at a time it becomes difficult to figure which change helped or hurt" turbo2256b » 1/16/2017
Chad - '70 LUEB on '77 frame (i.e. PS, D44, trapezoidal BB 9", 4.11), 250, NV 3550 & DSII to B transplanted, "T" D20/PTO, 2" SL, 1" BL, 4 discs, 33"X15", tool boxes, etc. Seeking: Hydraulic gear motor for Koenig pto. chrlsful@aol.com (413) 259-1749

drag-200stang
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Re: Fuel pump

Post #18 by drag-200stang » Thu May 31, 2018 8:55 am

I prefer electric, quicker starts...Also I like living on the edge. :wink:
We had a thread about this a while back.
66 Mustang Coupe
200 turbo w/lenco 4-spd
stock adj. rockers, stock timing set, ARP studs
best 1/4 mile ET 9.85/best mph 139 on 8 lbs progressing to 15 lbs boost
Went 9's when 10's was fast.

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