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09-19-2015, 03:08 PM
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#1
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Junior Member
Join Date: Feb 2011
Location: Delaware, Ohio
Posts: 13
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Hard Starting 454
I have a 1985 Pace Arrow with a 454 carb engine. The starter spins fast but it seems to take forever for it to start and requires a lot of pumping of the gas pedal. Last month the booster pump in the rear went out and it would not start at all. After replacing the booster we are right back where we started, hard to start but runs great. Is it possible that the engine driven fuel pump is not working?
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09-19-2015, 07:27 PM
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#2
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Senior Member
Newmar Owners Club
Join Date: Dec 2002
Location: Pasadena, Md.
Posts: 1,117
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Had a Chieftain with the same issue. Had the Carb replaced and it made a World of difference.
Carb. is not keeping gas in the bowl.
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CC..... Happy Rving!!
2013 Newmar - Canyon Star 3940
2021 Ford Edge ST
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09-19-2015, 07:32 PM
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#3
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Senior Member
Tiffin Owners Club Workhorse Chassis Owner
Join Date: Dec 2010
Location: Northern Virginia
Posts: 1,499
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Carb/choke, vacuum, or fuel filter would be my guess. You might ask for assistance in the Workhorse forum (located under RV Forums) - lots of smart 454 folks over there.
__________________
Tom and Amy from Northern Virginia.
2000 Allegro 454/Workhorse P32/TST/Crossfire
Life is a DIY project, so own less and live more
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09-19-2015, 08:15 PM
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#4
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Senior Member
Join Date: Jul 2014
Posts: 35,441
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Some of the old Qjet carbs had porous fuel bowls. They would drain, slowly into the manifold while sitting parked.
I remember a test was to run the engine until it nice and hot then shut It off.
While off, pull the air cleaner and watch for vapors rising out of the intake, while sitting. That would be a sign of fuel dripping into the hot intake manifold.
I had a boat with twin Qjet carbs. It would start fine after sitting 1 or 2 days. If it sat for 4 or 5 days, It would crank a long time before starting.
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09-20-2015, 06:33 AM
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#5
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Junior Member
Join Date: Feb 2011
Location: Delaware, Ohio
Posts: 13
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Thanks for the information. Does it affect the driving performance or just starting? Heading for the RV rally in Nashville next weekend don't think I will have time to change it before that.
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09-20-2015, 06:41 AM
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#6
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Senior Member
Winnebago Owners Club
Join Date: Feb 2014
Posts: 962
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Quote:
Originally Posted by ijds
Thanks for the information. Does it affect the driving performance or just starting? Heading for the RV rally in Nashville next weekend don't think I will have time to change it before that.
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Look for a "check valve". You should be able to find out whether it is in or near the carb.
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Denny
Stuart, Fl
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09-20-2015, 09:11 AM
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#7
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Senior Member
Join Date: Feb 2010
Posts: 4,654
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If it is a "thermo-quad" there is a gasket under it between throttle body and carb that dries out as well.
Try this;
Turn key on and count to 5 then turn key off.
Repeat 3 times then start it.
This may allow the tank pump to fill float Bowl.
Also how long before it is a problem as the vent will allow evaporation over some time.
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Tony & Lori
1989 Country Coach Savannah SE
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09-21-2015, 08:13 PM
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#8
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Senior Member
Join Date: Dec 2013
Location: Chicago Area
Posts: 1,296
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Quote:
Originally Posted by TQ60
If it is a "thermo-quad" there is a gasket under it between throttle body and carb that dries out as well.
Try this;
Turn key on and count to 5 then turn key off.
Repeat 3 times then start it.
This may allow the tank pump to fill float Bowl.
Also how long before it is a problem as the vent will allow evaporation over some time.
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That should only work with TBI where it pulses the injectors on the key turn. If he has any electric fuel pump at all, it should turn on and stay on any time the key is on. With the old 454, I used to let the pump run for about 20 seconds before cranking the engine. That was enough to fill the carb, and it always started right up, even in the dead of winter.
__________________
2004 AllegroBay 34XB Nov 2017 Banks, Front & Rear Trac bars, Konis
Sold:'83 Revcon Prince 31' FWD GM Performance 502 w/Edelbrock MPFI, Thorley Tri-Ys & Magnaflows, 4L85E 4 spd. Tested to exceed 100 mph.
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09-21-2015, 08:45 PM
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#9
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Senior Member
Join Date: Jul 2014
Posts: 35,441
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Man, its a long time ago, but I think, my fuel pump didn't run until I had oil pressure.
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09-22-2015, 04:40 AM
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#10
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Senior Member
Vintage RV Owners Club Fleetwood Owners Club
Join Date: Mar 2013
Location: c above
Posts: 5,525
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I have a 82 with a 454 I start mine, twice to the floor and turn the key turns over for about 10 seconds turn key off and then re try and she fires off in about 5 seconds. I had to replace the 2 filters under passenger side and this is how I start her every time spring summer fall.
Good luck, Tim
__________________
1982 Pace Arrow P30 454
KarKaddy SS, Toad: 2009 Genesis
Tim, Joe and Lilly too. Mpls Minn.
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09-23-2015, 02:40 AM
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#11
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Senior Member
Monaco Owners Club Vintage RV Owners Club
Join Date: Sep 2014
Location: anywhere U.S.A, Currently back home in Thailand!
Posts: 4,245
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If you have a booster pump, and have replaced it, then turn the key on for 20/30 seconds, let it have time to fill the float bowl, then start as normal.
The older q-jets boiled the gas out of the float bowls a lot, when shut off hot! Replacing the gasket under the carb with a thick one sometimes helped with this problem. Hope this helps you! Rail!
__________________
Retired, and "Always on Holiday!"
1996 Monaco Windsor 38PB, "Mona" 275 HP., 8.3 Cummins, 3060 Allison 6 speed, 2001 PT Cruiser, "Bailey"
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09-26-2015, 11:49 PM
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#12
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Senior Member
Winnebago Owners Club Freightliner Owners Club
Join Date: Apr 2008
Location: Mesa, AZ
Posts: 369
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Quote:
Originally Posted by TQ60
If it is a "thermo-quad" there is a gasket under it between throttle body and carb that dries out as well.
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The 454 Chevy will have a Quadrajet. The Thermo-quad was on the 440 Dodge engine.
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Ken & Jeannie - 96 Vectra Grand Tour 35' DP Freightliner 6 spd Allison Jack (silky terrier), Hannah (poodle), Casey (Cairn Terrier)
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09-27-2015, 09:00 AM
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#13
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Senior Member
Join Date: Feb 2010
Posts: 4,654
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Our boat with small block Chevy has one...
Our old rv with the 440 also had one and was told it could pass just about everything except a gas station...
Anything is possible.
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Tony & Lori
1989 Country Coach Savannah SE
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09-27-2015, 04:56 PM
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#14
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Senior Member
Join Date: Apr 2011
Posts: 670
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Quote:
Originally Posted by twinboat
Man, its a long time ago, but I think, my fuel pump didn't run until I had oil pressure.
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X2
My 90 with the Qjet wont turn on the electric fuel pump till oil pressure is achieved.
It just dawned on me, have you looked to see if the choke is setting? Some years ago my electric choke quit working and it took a little to start and it took awhile for the engine to warm up. Look to see if the choke is closing when you pump the throttle before start up.
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1990 28' Georgie Boy, 454, 4bbl, Thorley Headers, Recurved Distributor, 8.0 mpg. RVM 76
CAMPING: WHERE YOU SPEND A SMALL FORTUNE TO LIVE LIKE A HOMELESS PERSON.
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